Vehicle stability control system
Precautions Parts location System information Troubleshooting Diagnostic trouble codes Circuit diagnosis Removal / installation Other
BRAKE CONTROL
VEHICLE STABILITY CONTROL SYSTEM
PRECAUTIONS
1. Cautions for troubleshooting
(1) For malfunctions caused by a poor connection of terminals or parts, try reconnecting the relevant connector or parts. In some cases, this may temporarily or completely solve the problem.
(2) To locate the malfunctioning part, check the operational status, including the diagnostic code output and freeze frame data output at the time the malfunction occurred and record them before disconnecting each connector or removing/attaching the relevant parts Also, if a circuit open error code for instantaneous interruption monitoring is output, monitor instantaneous interruption before disconnecting connectors. (Refer to 
)
)(3) Considering a possibility that system other than the brake control system is affecting the malfunction, check diagnostic codes for other systems.
2. Precautions for handling and procedures
(1) Unless otherwise specified for the check procedures, make sure that IG is OFF before removing or attaching actuators and sensors.
(2) When the actuators and sensors have been removed or installed, perform a test mode check and diagnostic code output check to make sure that the normal display is output after all parts have been installed.
(3) Vehicle stability control-related parts adjustment may become faulty after removal or installation. Do not remove or install them unless necessary.
(4) When performing work related to Vehicle stability control, follow the instructions in this manual and make sure to perform all preparation work and confirm completion of the work.
3. Failsafe function
(1) If an error occurred in a part of ABS/TRC/Vehicle stability control/brake assist system, relevant warning light and indicator light illuminate. At the same time, ABS, TRC, Vehicle stability control, and brake assist system stop the operations.
NOTE:
EBD control continues as long as possible even when ABS control stops. If EBD control stops, the brake warning light illuminates.
4. Precautions for diagnostic codes
(1) As for some of the diagnostic codes, the warnings cannot be cleared only by repairing faulty parts.
(2) To clear the warning, diagnostic codes must be cleared or the procedures below must be followed.
Warning clearance procedures
| Diagnostic codes |
Procedures |
|---|---|
| C1464 C1465 C1466 C1467 C146C |
1. Replacement with new one or repair 2. IG ON 3. Drive (20 km/h or more for 30 seconds) → ABS warning light goes OFF |
| C1246 |
1. Replacement with new one or repair 2. Stop the vehicle for 5 seconds or longer with IG turned ON and lightly depress the brake pedal several times. 3. Strongly depress the brake pedal 3 times for 3 seconds while driving at the speed of 50 km/h or more → ABS warning light goes OFF |
CAUTION:
·Be careful to drive and stop the vehicle while the warning is being issued because the system does not have a fail-safe function.
·Currently issued diagnostic codes are stored in memory again.
·Currently issued diagnostic codes are stored in memory again.
5. Precautions for CAN communication
(1) Data communication in skid control computer (brake actuator ASSY) uses CAN communication. If CAN communication line has a problem, a diagnostic code of communication line error is output.
(2) If a CAN communication error code is output, repair the cause of fault in the communication line and troubleshoot the Vehicle stability control system under normal data communication conditions.
(3) The length and route of each CAN communication line is specified. Therefore they cannot be fixed or repaired using bypass wire harness for a temporal fix or repair.
FUNCTION INSPECTION
1. Initial check of brake system indicator light
(1) Turn the ignition switch to ON.
(2) Check that the ABS warning light, the brake warning light, the TRC OFF indicator light, the Vehicle stability control OFF indicator light, the Vehicle stability control SPORT indicator light and the slip indicator light illuminate and that they go off in approx. 3 seconds.
NOTE:
When any one of the lights does not illuminate, check the combination meter ASSY.
2. Brake actuator operation check
(1) Preparation for inspection
(a) Connect SSM3 to DLC3 with IG turned OFF, and start the engine.
(b) Turn SSM3 ON, and select [ABS/VDC System]→[Work Support]→[Function Check Sequence].
PARTS LOCATION
LIST OF DIAGNOSTIC CODES
Diagnostic code list
| Diagnostic codes |
Diagnostic items |
Code, stored in memory |
Reference pages |
|---|---|---|---|
| C1201 |
[ECM Failure] |
O |
|
| C1225 |
[VDC Switchover Valve (P)] |
O |
|
| C1226 |
[VDC Switchover Valve (S)] |
O |
|
| C1227 |
[VDC change-over valve 2 (P)] |
O |
|
| C1228 |
[VDC change-over valve 2 (S)] |
O |
|
| C1231 |
[Steering Angle Sensor] |
O |
|
| C1234 |
[Yaw rate sensor abnormal] |
O |
|
| C1237 |
[System Failure] |
O |
|
| C1241 |
[Power Supply Volt Error] |
O |
|
| C1246 |
[Pressure Sensor] |
O |
|
| C1249 |
[BLS Malfunction] |
O |
|
| C1288 |
[Incorrect VDC Control Module specifications] |
O |
|
| C1294 |
[AT abnormal] |
O |
|
| C1300 |
[Electrical Control Module] |
O |
|
| C1330 |
[Front Right ABS Sensor Circuit Open or Shorted Battery] |
O |
|
| C1331 |
[Front Left ABS Sensor Circuit Open or Shorted Battery] |
O |
|
| C1332 |
[Rear Righ ABS Sensor Circuit Open or Shorted Battery] |
O |
|
| C1333 |
[Rear Left ABS Sensor Circuit Open or Shorted Battery] |
O |
|
| C1419 |
[G Sensor Failure] |
O |
|
| C1464 |
[Front Right ABS Sensor Signal] |
O |
|
| C1465 |
[Front Left ABS Sensor Signal] |
O |
|
| C1466 |
[Rear Right ABS Sensor Signal] |
O |
|
| C1467 |
[Rear Left ABS Sensor Signal] |
O |
|
| C1468 |
[FR Valve] |
O |
|
| C1469 |
[FL Valve] |
O |
|
| C146A |
[RR Valve] |
O |
|
| C146B |
[RL Valve] |
O |
|
| C146C |
[Motor Relay] |
O |
|
| C146E |
[Valve Relay] |
O |
|
| C1472 |
[Lateral G Sensor malfunction] |
O |
|
| C1474 |
[Longitudinal G Sensor malfunction] |
O |
|
| U0073 |
[CAN failure/A system bus off detection] |
O |
|
| U0100 |
[Lost Communication With ECM/PCM “A”] |
O |
|
| U0101 |
[Lost Communication With TCM] |
O |
|
| U0126 |
[Nonarrival of H-CAN data(Steering angle sensor)] |
O |
|
SYMPTOM TABLE
1. Symptom table
(1) If normal diagnostic codes are output, but a malfunction occurs, follow the table below and check the relevant circuit for each symptom.
NOTE:
Refer to the flow chart for maintenance parts.
Symptom table for vehicle stability control system
| Symptoms |
Inspection items |
Reference pages |
|---|---|---|
| ABS warning light remains ON |
Refer to the flow chart “ABS warning light remains ON”. |
|
| The ABS warning light does not illuminate. |
Refer to the flow chart “The ABS warning light does not illuminate”. |
|
| Brake warning light remains ON |
Refer to the flow chart “brake warning light remains ON”. |
|
| The brake warning light does not illuminate. |
Refer to the flow chart “The brake warning light does not illuminate”. |
|
| TRC OFF indicator light remains ON |
Refer to the flow chart “TRC OFF indicator light remains ON”. |
|
| TRC OFF indicator light does not illuminate |
Refer to the flow chart “TRC OFF indicator light does not illuminate”. |
|
| Vehicle stability control OFF indicator light remains ON |
Refer to the flow chart “Vehicle stability control OFF indicator light remains ON”. |
|
| Vehicle stability control OFF indicator light does not illuminate |
Refer to the flow chart “Vehicle stability control OFF indicator light does not illuminate”. |
|
| Vehicle stability control SPORT indicator light remains ON |
Refer to the flow chart “Vehicle stability control SPORT indicator light remains ON”. |
|
| Vehicle stability control SPORT indicator light does not illuminate |
Refer to the flow chart “Vehicle stability control SPORT indicator light does not illuminate”. |
|
| Slip indicator light remains ON |
Refer to the flow chart “Slip indicator light remains ON”. |
|
| The slip indicator light does not illuminate. |
Refer to the flow chart “Slip indicator light does not illuminate”. |
|
DESCRIPTION OF FUNCTIONS
1. Anti-lock brake system (ABS)
(1) Helps prevent wheel lock when the brakes are applied quickly or on a slippery road surface.
2. Electronic brake distribution control (EBD)
(1) The EBD control uses the ABS to control distribution of brake force to front and rear wheels depending on driving conditions. Also, the system controls application of braking force to right and left wheels to stabilize vehicle motion while cornering.
3. Brake assist (BA)
(1) The main purpose of brake assist is to provide additional braking force for a driver who cannot depress the brake pedal hard when hard braking is needed. With this assist, braking performance of the vehicle is assured.
4. Traction control (TRC)
(1) Controls slipping of driving wheels when the driver depress the accelerator pedal too far to starts or accelerates the vehicle on a slippery surface.
5. Vehicle stability control
(1) Controls vehicle skidding sideways when vehicle is apt to understeer or oversteer excessively while cornering.
6. Parts function
| Parts |
Function |
|
|---|---|---|
| Brake actuator ASSY |
Skid control ECM |
Based on signals from sensors and switches, identifies driving conditions and sends brake control signal to the brake actuator ASSY. |
| Master cylinder pressure sensor |
Detects master cylinder pressure. |
|
| Pump motor |
Activates the pump in the brake actuator ASSY. |
|
| Solenoid valve |
·The hydraulic circuit has two master cylinder cut solenoid valves, two intake solenoid valves, four retaining solenoid valves, and four relief solenoid valves. ·To control a hydraulic pressure applied to the wheel cylinder, switches the hydraulic circuits based on the signal from the skid control during operation of the brake control system. |
|
| Yaw rate and acceleration sensors |
·The yaw rate sensor detects the vehicle yaw rate. · The acceleration sensor detects longitudinal acceleration and lateral acceleration of the vehicle. |
|
| Skid control ECM |
ABS motor relay |
Provides power supply to the pump motor. |
| ABS solenoid relay |
Provides power supply to the solenoid valve. |
|
| Speed sensor |
Detects four wheels and speed of each wheel. |
|
| Console switch ASSY |
Vehicle stability control OFF switch |
Normal mode, TRC OFF mode, or Vehicle stability control OFF mode is selectable. |
| Vehicle stability control SPORT switch |
Either normal mode or Vehicle stability control SPORT mode is selectable. |
|
| Stop light switch ASSY |
Detects the brake pedal signal issued when the pedal is depressed. |
|
| Main body ECM (multiplex network body ECM) |
Sends parking brake switch signal to the skid control ECM. |
|
| Parking brake switch ASSY |
Detect the condition of the parking brake pedal. |
|
| ECM |
·Sends signals including the accelerator pedal opening angle signal and the engine speed signal to the skid control ECM. ·Controls the engine output based on the signal received from the skid control ECM. |
|
| TCM |
Sends gear position signal to the skid control ECM. |
|
| Steering angle sensor |
Detects the steering direction of a steering wheel and the steering wheel angle. |
|
| Parts |
Function |
|
|---|---|---|
| Combination meter ASSY |
ABS warning light |
When the skid control ECM detects an ABS malfunction, it illuminates to let the driver know the malfunction occurrence. |
| Brake warning light |
·When the skid control ECM detects an EBD malfunction or a brake system malfunction, it illuminates to let the driver know the malfunction occurrence. ·When the brake fluid level is low, it illuminates to let the driver know the condition. ·When the parking brake is operated, it illuminates to let the driver know the operation. |
|
| TRC OFF indicator light |
When the TRC OFF mode is selected, it illuminates to let the driver know the selection. |
|
| Vehicle stability control OFF indicator light V |
When the Vehicle stability control OFF mode or Vehicle stability control SPORT mode is selected, it illuminates to inform the driver of the selection. |
|
| Vehicle stability control SPORT indicator light |
When the stability control SPORT mode is selected, it illuminates to inform the driver of the selection. |
|
| Slip indicator light |
· When TRC control or Vehicle stability control is taking place, it flashes to inform the driver that the control is active. ·When the skid control ECM detects a TRC malfunction and/or a Vehicle stability control malfunction, it illuminates to inform the driver of the malfunction occurrence. |
|
HOW TO TROUBLESHOOT
1.
Bring in the car
Next▼
2.
Interview and phenomenon check
Next▼
3.
Battery voltage check
(1) Check the battery voltage.
Voltage
: 11 to 14 V
NOTE:
If the battery voltage is less than 11 V, recharge or replace the battery before starting the diagnostic procedures.
Next▼
4.
Diagnostic code and freeze frame data check (Refer to )
)(1) Check and record the diagnostic code and the freeze frame data.
(2) Clear the diagnostic code and the freeze frame data.
(3) Diagnostic code list recheck
(a) Based on the recorded diagnostic code and the freeze frame data, reproduce the malfunction and check the diagnosis code again.
NOTE:
·When a diagnostic code is output, refer to “List of diagnostic codes()”.
·If an error code for CAN communication system is output, first troubleshoot CAN communication and repair it. (Refer to)
·If SSM3 cannot communicate with skid control computer (brake actuator ASSY), check CAN communication. (Refer to)
·If there is no respond from the skid control computer (brake actuator ASSY), check the power and voltage input circuit for the skid control computer (brake actuator ASSY). (Refer to)
)”.·If an error code for CAN communication system is output, first troubleshoot CAN communication and repair it. (Refer to
)·If SSM3 cannot communicate with skid control computer (brake actuator ASSY), check CAN communication. (Refer to
)·If there is no respond from the skid control computer (brake actuator ASSY), check the power and voltage input circuit for the skid control computer (brake actuator ASSY). (Refer to
)Result
| Result |
Go to |
|---|---|
| Diagnostic code is not output. Malfunction can be checked and reproduced. |
A |
| Diagnostic code is output. |
B |
| Diagnostic code is not output. Malfunction cannot be checked and reproduced. |
C |
B
>Refer to “List of diagnostic codes ()” and perform troubleshooting for each code. Then go to step 7.
)” and perform troubleshooting for each code. Then go to step 7.C
>Go to “Malfunction simulation ()”.
)”.A▼
5.
Symptom table (Refer to )
)Result
| Result |
Go to |
|---|---|
| Not applicable to the symptom table. |
A |
| Applicable to the symptom table. |
B |
B
>Perform troubleshooting for relevant symptom and go to step 8.
A▼
6.
Perform troubleshooting in the following procedures according to the trouble phenomenon.
(1) Current Data Display & save (Refer to )
)(2) Function inspection (Refer to )
)(3) ECM terminal arrangement (Refer to )
)Next▼
7.
Adjustment, repair, or replacement
Next▼
8.
Confirmation test
Next▼
Complete
CHECK LIST FOR INTERVIEW
| Details of vehicle |
|||
|---|---|---|---|
| Customer’s name |
Registration year and date |
||
| Vehicle bring-in date |
|||
| Vehicle delivery (planned) date |
|||
| Registration No. |
Odometer reading |
||
| Frame No. |
- |
||
| Result of interview |
|||
|---|---|---|---|
| Date trouble occurred |
|||
| Frequency of trouble occurrence |
□ Continuous □ Sometimes occurs ( times per day/week/month) |
||
| Location where the vehicle is used mainly |
□ Inner city □ Suburbs □ Mountain side □ Other ( ) |
||
| Frequency of usage |
□ Almost everyday □ Sometimes occurs ( times per day/week/month) |
||
| Contents of interview |
Conditions before the trouble occurred (Was there an unusual phenomenon or operation?) |
||
| Conditions when the trouble occurred (When, where, what, how/as detailed as possible) |
|||
| Conditions after the trouble occurred (What kind of operations?/ Warning indicator/Engine could be started or not?/How was the vehicle?/etc.) |
|||
| Driving condition |
Vehicle speed (
) □ At starting □ When accelerating □ When driving at a steady speed □ When decelerating □ When braking □ When stopping □ When parking □ When turning □ Other ( ) |
||
| Road condition |
□ Flat (level) road □ Slope (uphill/downhill) □ Dry paved road □ Wet paved road □ Rugged paved road □ Unpaved road □ Snow-covered/hardened snow-covered/icy road □ Bump/curbstone □ Other ( ) |
||
| Operational conditions |
Brake pedal operation: □ Moderate brake □ Sudden brake □ Operation with left foot □ Condition when brake is not applied. Acceleration operation: □ When depressing the brake pedal □ Keep depressing the brake pedal □ When depressing the brake pedal less □ When releasing the brake pedal |
||
| Vehicle’s condition |
Vehicle’s usage condition: □ While leaving the vehicle (Time/day) □ Before starting the ignition (when IG is turned ON) □ At starting/right after starting □ After starting ( minutes later) □ After starting ( minutes later) Engine Condition: □ While engine is stopping □ While engine is running Shift position (display) condition: □ Shift position ( ) □ Shift position ( → when operating) □ No display □ Unknown Warning light illumination status: □ ABS □ Brake □ TRC OFF □ Vehicle stability control OFF □ Vehicle stability control SPORT □ Slip □ Other ( ) Other (Electric load, remaining fuel level, etc.): □ ( ) □ ( ) □ ( ) |
||
Diagnostic codes
| ABS/Vehicle stability control system |
Output code |
|---|---|
| 1st |
|
| 2nd |
|
| th time |
|
| Diagnostic code except for ABS/Vehicle stability control system |
Freeze frame data
| Item name |
Recorded value |
Unit |
|---|---|---|
| Time elapsed after the system froze |
msec |
|
| Number of turning IG ON after the system froze |
- |
|
| Stop light switch |
OFF/ON |
- |
| Gear position information* |
Unknown/Lo/2nd/3rd/4th/5th/6th/P, N/R |
- |
| System in operation |
ABS / VSC / TRC / HBA |
- |
| Yaw rate sensor |
°/s |
|
| Lateral G sensor |
m/s2 |
|
| Longitudinal G sensor |
m/s2 |
|
| Wheel speed FR |
km/h |
|
| Wheel speed FL |
km/h |
|
| Wheel speed RR |
km/h |
|
| Wheel speed RL |
km/h |
|
| Accelerator pedal opening rate |
% |
|
| Steering angle sensor |
° |
|
| TRC/VSC OFF mode |
Normal / TRC OFF / VSC OFF |
- |
| VSC SPORT mode |
Normal/SPORT mode |
- |
*: Transmission A/T
CHECKING / CLEARING DIAGNOSTIC CODES
1. Diagnostic code output check
(1) Diagnostic code reading by SSM3
(a) Connect SSM3 to DLC3 with IG turned OFF.
(b) Turn IG ON and follow SSM3’s display to read the diagnostic code.
CAUTION:
If there is an error, clear the diagnostic code memory after repairing.
2. Clear the diagnostic code and the freeze frame data.
(1) Diagnostic code clearance by SSM3
(a) Connect SSM3 to DLC3 with IG turned OFF.
(b) Turn IG ON and follow SSM3’s display to clear the diagnostic code.
FREEZE FRAME DATA
1. Check freeze frame data output
(1) Using SSM3, you can check the vehicle (sensor) conditions when an abnormal diagnostic code is stored in memory.
2. Freeze frame data check when a diagnostic code is stored in memory
(1) If a diagnostic code is output, the freeze frame data at the time of error code occurrence is stored in memory.
(2) When the freeze frame data at the time of diagnostic code occurrence is stored in memory, the data will not be updated or cleared until the memory data is cleared (until the diagnostic code is cleared).
(3) It saves and displays the record, which is up to 31 times of turning IG OFF → ON since the error code has been stored in memory.
NOTE:
The number of turning IG ON exceeds 31, “31” is displayed.
(4) Freeze frame data check when a diagnostic error code is stored in memory
(a) Connect the SSM3 to the DLC3 and turn the ignition to IG ON.
(b) Display the error code on the diagnostic code confirmation screen. (Refer to )
)List of freeze frame data
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| Stop light switch |
Indicates the stop light switch’s status. Display range: OFF/ON |
OFF: Brake pedal, released ON: Brake pedal, depressed |
- |
| Gear position information* |
Indicates the gear position of the transmission. Display range: Unknown/Lo/2nd/3rd/4th/5th/6th/P, N/R |
Indicates the gear position (speed) of the transmission. |
- |
| System in operation |
Indicates operation status of each system. Display range: ABS/VSC/TRC/HBA |
- |
Indicates operation status of each system. |
| Yaw rate sensor |
Indicates yaw rate. Display range: -128 to 127°/s |
When stopping: 0°/s Right turn: -128 to 0°/s Left turn: 0 to 127°/s |
- |
| Lateral G sensor |
Indicates lateral G. Display range: -25.10 to 24.90 m/s2 |
While steering: It varies in proportion to the generated G. |
- |
| Longitudinal G sensor |
Indicates longitudinal G. Display range: -25.10 to 24.90 m/s2 |
While acceleration: It varies in proportion to the generated G. |
- |
| Wheel speed FR |
Indicates the front right wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed FL |
Indicates the front left wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed RR |
Indicates the rear right wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed RL |
Indicates the rear left wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Accelerator pedal opening rate |
Indicates the accelerator pedal opening rate. Display range: 0.0 to 100.0 % |
While the accelerator pedal is being operated: It varies in proportion to the amount of depressing the pedal. Accelerator pedal, not being operated: Approx. 0 % |
- |
| Steering angle sensor |
Indicates the steering angle (plus value when steering to left). Display range: -719.9 to 719.9° |
While steering to left: It varies consecutively in plus value. While steering to right: It varies consecutively in plus value. |
- |
| TRC/VSC OFF mode |
Indicates the status for TRC/Vehicle stability control OFF mode. Display range: Normal/TRC OFF/VSC OFF |
Normal mode: When TRC and Vehicle stability control are permitted. TRC OFF mode: When TRC is prohibited. VSC OFF mode: When Vehicle stability control and TRC are prohibited. |
- |
| VSC SPORT mode |
Indicates the status for Vehicle stability control SPORT mode. Display range: Normal/SPORT mode |
Normal: In normal mode SPORT: In Vehicle stability control SPORT mode |
- |
*: Transmission A/T
FAILSAFE LIST
1. Fail safe operation
NOTE:
·If there is a malfunction in the sensor signal or the actuator system, the skid control ECM prohibits the power supply to the brake actuator ASSY.
·In response to the signal received from the skid control ECM, the brake actuator turns the solenoid off. Under this condition, the vehicle operates in the same way as those vehicles without ABS, TRC, and Vehicle stability control systems.
·The EBD control continues to function in a range where the control is possible, although ABS control is prohibited. When the EBD control becomes impossible, the brake warning light illuminates and the driver is warned of the condition.
·When a malfunction occurs in the Vehicle stability control system components before the Vehicle stability control takes place, the Vehicle stability control will be prohibited. When a malfunction occurs in the system components while the Vehicle stability control is active, the system will be disabled.
·When its steady control becomes impossible, the warning light illuminates and the driver is warned of the cancellation of system control. (Refer to BC-24)
·In response to the signal received from the skid control ECM, the brake actuator turns the solenoid off. Under this condition, the vehicle operates in the same way as those vehicles without ABS, TRC, and Vehicle stability control systems.
·The EBD control continues to function in a range where the control is possible, although ABS control is prohibited. When the EBD control becomes impossible, the brake warning light illuminates and the driver is warned of the condition.
·When a malfunction occurs in the Vehicle stability control system components before the Vehicle stability control takes place, the Vehicle stability control will be prohibited. When a malfunction occurs in the system components while the Vehicle stability control is active, the system will be disabled.
·When its steady control becomes impossible, the warning light illuminates and the driver is warned of the cancellation of system control. (Refer to BC-24)
ABS, EBD, and BA systems
| Item |
Operation |
|---|---|
| ABS system malfunction |
ABS, BA, TRC, and Vehicle stability control are prohibited. |
| BA system malfunction |
ABS, BA, TRC, and Vehicle stability control are prohibited. |
| EBD system malfunction |
ABS, EBD, BA, TRC, and Vehicle stability control are prohibited. |
TRC and Vehicle stability control system
| Item |
Operation |
|---|---|
| Malfunction of engine control system (TRC and Vehicle stability control system) |
Before control takes place: Disables the control. Control ON: Control with brake only |
| Malfunction of automatic transmission control system (TRC and Vehicle stability control system) |
Disables the control. |
| Malfunction of brake control system (Vehicle stability control system) |
Disables the control. |
| Brake control system malfunction (TRC system) |
Before control takes place: Disables the control. Control ON: The control is disabled. |
WORK SUPPORT
1. VDC sensor midpoint setting mode
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform VDC sensor midpoint setting.
·Make sure to perform [VDC sensor midpoint setting mode] on a level surface (grade of 1 % or less). While centering, do not shake the vehicle or open/close a door.
·Make sure to perform [VDC sensor midpoint setting mode] on a level surface (grade of 1 % or less). While centering, do not shake the vehicle or open/close a door.
NOTE:
When performing [VDC sensor midpoint setting mode], make sure to set zero point of yaw rate sensor & G sensor (brake actuator ASSY is integrated) and steering sensor.
(1) Turn the ignition switch to OFF.
(2) Shift into neutral and apply the parking brake.
(3) Connect the SSM3 to the DLC3.
(4) Turn the ignition switch to ON.
(5) Set the steering wheel in a straight position.
(6) On the SSM3 screen, select [ABS/VDC System]→[Work Support]→[VDC sensor midpoint setting mode].
(7) Following the SSM3 screen, perform [VDC sensor midpoint setting mode].
2. Changing modes
·When it is necessary to temporarily stop the control while operating the vehicle on a device such as free rollers, enter into the check mode. While in the check mode, DTCs listed in the list may be stored.
·If any DTCs are stored, clear the DTCs using SSM3. After turning IG OFF→ON, the conditions are normal if speed sensor related DTCs are not stored.
·If any DTCs are stored, clear the DTCs using SSM3. After turning IG OFF→ON, the conditions are normal if speed sensor related DTCs are not stored.
Code list
| Code no. [SAE] |
Content of diagnosis |
|---|---|
| C1271 |
FR wheel speed sensor signal, lost |
| C1272 |
FL wheel speed sensor signal, lost |
| C1273 |
RR wheel speed sensor signal, lost |
| C1274 |
RL wheel speed sensor signal, lost |
| C1275 |
FR wheel speed sensor signal error |
| C1276 |
FL wheel speed sensor signal error |
| C1277 |
RR wheel speed sensor signal error |
| C1278 |
RL wheel speed sensor signal error |
CIRCUIT FIGURE
| ECM transmission (transmitter) |
ECM transmission |
Signal |
Communication method |
|---|---|---|---|
| Steering sensor |
Skid control ECM |
Steering sensor signal CAN |
CAN communication line |
| Skid control ECM |
ECM |
·Wheel speed signal ·Vehicle stability control data signal |
CAN communication line |
| ECM |
Skid control ECM |
·Accelerator opening angle signal ·Engine speed signal ·Diagnostic signal |
CAN communication line |
| TCM |
Skid control ECM |
Gear position signal |
CAN communication line |
| Skid control ECM |
Power steering ECM ASSY |
Vehicle stability control data signal |
CAN communication line |
| Main body ECM |
Skid control ECM |
Parking brake switch signal |
CAN communication line |
| Skid control ECM |
Combination meter ASSY |
·ABS warning light signal ·Brake warning light signal ·TRC OFF indicator light signal ·Vehicle stability control OFF indicator light signal ·Vehicle stability control SPORT indicator light signal ·Slip indicator light signal ·Wheel speed signal |
CAN communication line |
ECM TERMINAL ARRANGEMENT
1. Skid control computer (brake actuator ASSY) terminal arrangement
Captions in illustration
| *a |
Connector not connected (Skid control computer (brake actuator ASSY)) |
- |
- |
NOTE:
·The skid control computer is integrated into the brake actuator ASSY and uses water-proof connectors. Therefore, voltage check and oscilloscope waveform checks for each terminal cannot be performed with the computer installed in the vehicle.
·For the operation check and communication check of the skid control computer (brake actuator ASSY), use the data monitor and active test in the SSM3. (Refer to)
·For the operation check and communication check of the skid control computer (brake actuator ASSY), use the data monitor and active test in the SSM3. (Refer to
)Skid control computer (brake actuator ASSY) terminal arrangement
| Terminal No. |
terminal symbol |
Terminal name |
|---|---|---|
| 1 |
+BM |
Motor relay drive power supply |
| 2 |
SPD |
Vehicle speed signal output |
| 4 |
FR- |
Speed sensor FR RH signal input |
| 12 |
CSW1 |
Vehicle stability control OFF switch input |
| 13 |
GND2 |
Actuator pump motor GND |
| 14 |
CANL |
CAN communication input/output |
| 16 |
FR+ |
Speed sensor FR RH power supply output |
| 17 |
RR+ |
Speed sensor RR RH power supply output |
| 18 |
RL- |
Speed sensor RR LH signal input |
| 19 |
FL+ |
Speed sensor FR LH power supply output |
| 25 |
+BS |
Solenoid relay drive power supply |
| 26 |
CANH |
CAN communication input/output |
| 27 |
CSW2 |
Vehicle stability control SPORT switch input |
| 28 |
IG1 |
IG power supply (ECM power supply) input |
| 29 |
RR- |
Speed sensor RR RH signal input |
| 30 |
STP |
Stop light switch input |
| 31 |
RL+ |
Speed sensor RR LH power supply output |
| 32 |
FL- |
Speed sensor FR LH signal input |
| 38 |
GND1 |
Skid control computer GND |
2. Skid control computer (brake actuator ASSY), wiring harness side connector check
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
- |
- |
(1) Disconnect the connector from the skid control computer (brake actuator ASSY).
(2) Check the voltage and resistance between chassis ground and each terminal of the connector on the wiring harness side of the skid control computer (brake actuator ASSY).
Criteria
| Terminal No. (terminal symbol) |
Terminal description |
Measuring condition |
Standard value |
|---|---|---|---|
| A5-1 (+BM)←→chassis ground |
Motor relay drive power supply |
Always |
11 to 14 V |
| A5-12 (CSW1)←→chassis ground |
Vehicle stability control OFF switch input |
Press and hold Vehicle stability control OFF switch. |
Less than 1 Ω |
| Release Vehicle stability control OFF. |
10 k Ω or more |
||
| A5-13 (GND2) ←→ chassis ground |
Actuator pump motor GND |
Always |
Less than 1 Ω |
| A5-25 (+BS) ←→ chassis ground |
Solenoid relay drive power supply |
Always |
11 to 14 V |
| A5-27 (CSW2) ←→ chassis ground |
Vehicle stability control SPORT switch input |
Press and hold Vehicle stability control SPORT switch. |
Less than 1 Ω |
| Release Vehicle stability control SPORT switch. |
10 k Ω or more |
||
| A5-28 (IG1) ←→ chassis ground |
IG power supply (ECM power supply) input |
IG ON |
11 to 14 V |
| A5-30 (STP) ←→ chassis ground |
Stop light switch input |
Brake pedal, depressed |
8-14 V |
| Brake pedal, released |
Less than 1.5 V |
||
| A5-38 (GND1) ←→ chassis ground |
Skid control computer GND |
Always |
Less than 1 Ω |
CURRENT DATA DISPLAY & SAVE
1. Current Data Display
(1) Connect SSM3 to DLC3 with IG turned OFF.
(2) Turn IG ON and follow SSM3’s screen to check the current data display.
CAUTION:
Factors including slight margins of error in measurement, differences in measurement environments, and vehicle’s time-dependent change may significantly affect the computer data values. Thus it is difficult for the computer data to show reliable standard values (judgment values). Therefore, even if the value is within the standard range, an error may occur.
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| Wheel speed FR |
Indicates the front right wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed FL |
Indicates the front left wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed RR |
Indicates the rear right wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed RL |
Indicates the rear left wheel speed. Display range: 0.0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Lateral G Sensor |
Indicates lateral G. Display range: -25.10 to 24.90 m/s2 |
While steering: It varies in proportion to the generated G. |
- |
| Longitudinal G Sensor |
Indicates longitudinal G. Display range: -25.10 to 24.90 m/s2 |
While acceleration: It varies in proportion to the generated G. |
- |
| Yaw Rate Sensor |
Indicates yaw rate. Display range: -128 to 127°/s |
While steering: It varies in proportion to the generated yaw. |
- |
| Steering angle sensor |
Indicates the steering angle (plus value when steering to left). Display range: -3276.8 to 3276.7° |
While operating the steering: It varies in proportion to the steering. |
- |
| IGN Voltage |
Indicates the IGN voltage. Display range: 0.0 to 20V |
- |
- |
| Motor relay voltage |
Indicates the motor relay voltage. Display range: 0.0 to 20 V |
- |
- |
| Stop light switch |
Indicates the stop light switch operation. Display range: OFF/ON |
OFF: Brake pedal, released ON: Brake pedal, depressed |
- |
| ABS Warning Lamp |
Indicates the ABS warning light condition. Display range: OFF/ON |
OFF: ABS warning light ON: ABS warning light |
- |
| EBD Warning Light |
Indicates the brake warning light condition. Display range: OFF/ON |
OFF: Brake warning light ON: Brake warning light |
- |
| Slip Indicator |
Indicates the slip indicator light condition. Display range: OFF/ON |
OFF: Slip indicator light ON: Slip indicator light |
- |
| Solenoid Relay |
Indicates the solenoid relay operation. Display range: OFF/ON |
OFF: Solenoid not operating ON: Solenoid operating |
- |
| Motor Relay |
Indicates the motor relay operation. Display range: OFF/ON |
OFF: Motor system, not operating ON: Motor, operating |
- |
| Master cylinder pressure |
Indicates values on the master cylinder pressure sensor Display range: -1.00 to 23.99 Mpa |
The value is proportional to depressing force: While the pedal is being operated Approx. -1 to 0 MPa: Pedal, released |
- |
| TRC Active |
Indicates whether the traction control is operating or not. Display range: Out of Controlling/During control |
Out of Controlling: Traction control is not under control During control: Traction control is under control |
- |
| TRC/VSC OFF mode |
Indicates the status for TRC/Vehicle stability control OFF mode. Display range: Normal/TRC OFF/VSC OFF |
Normal mode: When TRC and Vehicle stability control are permitted. TRC OFF mode: When TRC is prohibited. VSC OFF mode: When Vehicle stability control and TRC are prohibited. |
- |
| FR brake control (VSC) |
Indicates whether the front right wheel is controlled by Vehicle stability control or not. Display range: OFF/ON |
OFF: Not controlled ON: Controlled |
- |
| FL brake control (VSC) |
Indicates whether the front left wheel is controlled by Vehicle stability control or not. Display range: OFF/ON |
OFF: Not controlled ON: Controlled |
- |
| RR brake control (VSC) |
Indicates whether the rear right wheel is controlled by Vehicle stability control or not. Display range: OFF/ON |
OFF: Not controlled ON: Controlled |
- |
| RL brake control (VSC) |
Indicates whether the rear left wheel is controlled by Vehicle stability control or not. Display range: OFF/ON |
OFF: Not controlled ON: Controlled |
- |
| Throttle shut demand (VSC) |
Indicates the demand to close the throttle from the skid control computer (brake actuator ASSY). Display range: OFF/ON |
OFF: Throttle closing, no demand ON: Throttle closing, demand |
- |
| Throttle open demand (VSC) |
Indicates the demand to open the throttle from the skid control computer (brake actuator ASSY). Display range: OFF/ON |
OFF: Throttle opening, no demand ON: Throttle opening, demand |
- |
| VSC SPORT mode |
Indicates the status for Vehicle stability control SPORT mode. Display range: Normal/SPORT mode |
Normal: In normal mode SPORT: In Vehicle stability control SPORT mode |
- |
| Under Control of ABS (FR) |
Indicates whether the front right wheel is controlled by ABS or not. Display range: Out of Controlling/During control |
Out of Controlling: ABS is not under control During control: ABS is under control |
- |
| Under Control of ABS (FL) |
Indicates whether the front left wheel is controlled by ABS or not. Display range: Out of Controlling/During control |
Out of Controlling: ABS is not under control During control: ABS is under control |
- |
| Under Control of ABS (RR) |
Indicates whether the rear right wheel is controlled by ABS or not. Display range: Out of Controlling/During control |
Out of Controlling: ABS is not under control During control: ABS is under control |
- |
| Under Control of ABS (RL) |
Indicates whether the rear left wheel is controlled by ABS or not. Display range: Out of Controlling/During control |
Out of Controlling: ABS is not under control During control: ABS is under control |
- |
| Under Control of EBD (FR) |
Indicates the EBD control condition on front right wheel. Display range: Out of Controlling/During control |
Out of Controlling: EBD is not under control During control: EBD is under control |
- |
| Under Control of EBD (FL) |
Indicates the EBD control condition on front left wheel. Display range: Out of Controlling/During control |
Out of Controlling: EBD is not under control During control: EBD is under control |
- |
| Under Control of EBD (RR) |
Indicates the EBD control condition on rear right wheel. Display range: Out of Controlling/During control |
Out of Controlling: EBD is not under control During control: EBD is under control |
- |
| Under Control of EBD (RL) |
Indicates the EBD control condition on rear left wheel. Display range: Out of Controlling/During control |
Out of Controlling: EBD is not under control During control: EBD is under control |
- |
| DTC | C1201 | EGI error |
|---|
Description of functions
When an EFI system error is input, this code will be output to illuminate the slip indicator light. (Vehicle stability control system is normal.)
Under the EFI system error, TRC and Vehicle stability controls are prohibited for fail safe.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1201 |
When receiving engine error signal while driving. |
Engine control computer |
| DTC | C1225 | VDC switching valve 1 (P) |
|---|
| DTC | C1226 | VDC switching valve 1 (S) |
|---|
| DTC | C1227 | VDC switching valve 2 (P) |
|---|
| DTC | C1228 | VDC switching valve 2 (S) |
|---|
| DTC | C1468 | FR solenoid valve system |
|---|
| DTC | C1469 | FL solenoid valve system |
|---|
| DTC | C146A | RR solenoid valve system |
|---|
| DTC | C146B | RL solenoid valve system |
|---|
Description of functions
Each solenoid adjusts the pressure applied to each wheel cylinder to control the vehicle.
While an abnormal diagnostic code is being output, the fail safe function turns OFF the solenoid relay forcibly. Therefore the solenoid will not be turned ON.
The solenoid relay and the solenoid are integrated into the brake actuator ASSY.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1225 C1226 C1227 C1228 C1468 C1469 C146A C146B |
When the solenoid signal does not match the check result |
Brake actuator ASSY (Internal error) |
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code output check
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)| DTC | C1231 | Steering angle sensor malfunction |
|---|
Description of functions
The skid control computer (brake actuator ASSY) inputs the steering sensor signal through CAN communication.
If there is a trouble in the communication line connected to the steering sensor, the diagnostic code “U0126(Nonarrival of H-CAN data(Steering angle sensor))” is output.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1231 |
When the voltage at +BS terminal is between 9.6 to 16.5 V, a steering sensor error signal is received. |
·ECM IG1 fuse ·Wiring harness or connector ·Steering sensor |
Circuit figure
Inspection steps
CAUTION:
·When the steering sensor has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Check the diagnosis codes
(1) Clear the diagnostic code. (Refer to )
)(2) Turn the ignition switch to OFF.
(3) Turn IG ON again and check that no diagnostic code for CAN communication error is output. (Refer to )
)(4) Driving at 35 km/h or more and operating the steering wheel, make sure that no diagnostic code for speed sensor error and yaw rate sensor error is output. (Refer to )
)
Result
| Result |
Go to |
|---|---|
| None of CAN communication error code, speed sensor error code, or yaw rate sensor error code is output. |
A |
| CAN communication error code is output. |
B |
| Speed sensor error code or yaw rate sensor error code is output |
C |
NOTE:
·When there is a trouble in the speed sensor or the yaw rate sensor, even if the steering sensor is normal, abnormal value may be issued.
·If both speed sensor error code and yaw rate sensor error code are output at the same time, repair them and then check the steering sensor.
·If both speed sensor error code and yaw rate sensor error code are output at the same time, repair them and then check the steering sensor.
B
>To CAN communication system (How to troubleshoot) (Refer to )
)C
>To relevant diagnostic code (Refer to )
)A▼
2.
Check wiring harness and connector (steering sensor power supply)
(1) Check the steering sensor connector for poor engagement or disconnection.
Criteria
: No trouble
(2) Disconnect the connector D56 for the steering sensor.
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| D56-4(IG) - chassis ground |
IG ON |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| D56-1(ESS) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Steering sensor connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of steering sensor (Refer to )
)| DTC | C1234 | Yaw rate sensor error |
|---|
| DTC | C1419 | G sensor error |
|---|
| DTC | C1472 | Lateral G sensor error |
|---|
| DTC | C1474 | Longitudinal G sensor error |
|---|
Description of functions
If there is a malfunction in the yaw rate sensor which is integrated into the skid control computer (brake actuator ASSY), the skid control computer (brake actuator ASSY) outputs a diagnostic code and prohibits the Vehicle stability control operation for fail safe.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1234 |
Skid control computer (brake actuator ASSY) internal error (yaw rate sensor) |
Skid control computer (brake actuator ASSY) |
| C1419 |
Skid control computer (brake actuator ASSY) internal error (G sensor) |
|
| C1472 |
Skid control computer (brake actuator ASSY) internal error (lateral G sensor) |
|
| C1474 |
Skid control computer (brake actuator ASSY) internal error (longitudinal G sensor) |
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Skid control computer (brake actuator ASSY) installation condition check
(1) Check the installation condition of the skid control computer (brake actuator ASSY). (Refer to )
)NG
>Install it correctly (Refer to )
)OK▼
2.
Replacement of skid control computer (brake actuator ASSY)
(1) Replace the skid control computer (brake actuator ASSY). (Refer to )
)Next▼
Complete
| DTC | C1237 | System error |
|---|
Description of functions
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1237 |
·Outputs from the speed sensors at 4 wheels are all different. ·Speed sensor signal pulse error for 3 wheels or more. ·ABS control continues for long time ·Vehicle stability control continues for a long time |
·Tire size error ·Speed sensor ·Speed sensor rotor ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
Circuit figure
For circuit figure, refer to and
and Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Tire size check
(1) Check the 4 wheel tire size.
Criteria
: Specified size
NG
>Replace with the tire of specified size.
OK▼
2.
Current Data Display (Wheel speed)
(1) Using SSM3, check [Current Data Display] of [Wheel speed] while driving straight at a speed of 10 km/h or more. (Refer to )
)
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Wheel Speed FR] |
Indicates the front right wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| [Wheel Speed FL] |
Indicates the front left wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| [Wheel Speed RR] |
Indicates the rear right wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| [Wheel Speed RL] |
Indicates the rear left wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
Criteria
: There is no big difference from the speed meter.
Result
| Result |
Go to |
|---|---|
| OK |
A |
| NG (front side) |
B |
| NG (rear side) |
C |
B
> Go to step 4.
C
> Go to step 12.
A▼
3.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 4.
C
> Go to step 12.
A▼
Malfunction reproduction test (Refer to )
)4.
Speed sensor installation condition check
NG
>Properly install the speed sensor or replace it.
OK▼
5.
Speed sensor check
(1) Remove the speed sensor from the relevant wheel and check it for foreign matter adhesion or damage at the tip. (Refer to )
)
Criteria
: There is no foreign particles or damage.
CAUTION:
If there is no damage in the speed sensor through this check, do not replace the speed sensor.
NG
>Clean or replace the speed sensor.
OK▼
6.
Check wiring harness and connector (speed sensor brake actuator ASSY)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Disconnect the connector, A12 or A42 of the front speed sensor.
(4) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(5) Measure the resistance between the terminals.
Resistance
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-16(FR+) - A42-2(FR+) |
Always |
Less than 1 Ω |
| A5-16(FR+) - chassis ground |
Always |
10 k Ω or more |
| A5-4(FR-) - A42-1(FR-) |
Always |
Less than 1 Ω |
| A5-4(FR-) - chassis ground |
Always |
10 k Ω or more |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-19(FL+) - A12-2(FL+) |
Always |
Less than 1 Ω |
| A5-19(FL+) - chassis ground |
Always |
10 k Ω or more |
| A5-32(FL-) - A12-1(FL-) |
Always |
Less than 1 Ω |
| A5-32(FL-) - chassis ground |
Always |
10 k Ω or more |
NG
>Repair or replacement of wiring harness or connector
OK▼
7.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Malfunction reproduction test (Refer to )
)A▼
8.
Replacement of front speed sensor
(1) Replace the relevant front speed sensor with error code. (Refer to )
)Next▼
9.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Completed
A▼
10.
Replacement of speed sensor rotor
(1) Replace the relevant speed sensor rotor with error code. (Refer to )
)
NOTE:
The speed sensor rotor is assembled in the front axle hub. Therefore, replace the front axle hub.
Next▼
11.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Completed
12.
Speed sensor installation condition check
NG
>Properly install the speed sensor or replace it.
OK▼
13.
Speed sensor check
(1) Remove the speed sensor from the relevant wheel and check it for foreign matter adhesion or damage at the tip. (Refer to )
)
Criteria
: There is no foreign particles or damage.
CAUTION:
If there is no damage in the speed sensor through this check, do not replace the speed sensor.
NG
>Clean or replace the speed sensor.
OK▼
14.
Check wiring harness and connector (speed sensor brake actuator ASSY)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Disconnect the connector, G9 or H12 for the rear speed sensor.
(4) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(5) Measure the resistance between the terminals.
Resistance
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-17(RR+) - G9-2(RR+) |
Always |
Less than 1 Ω |
| A5-17(RR+) - chassis ground |
Always |
10 k Ω or more |
| A5-29(RR-) - G9-1(RR-) |
Always |
Less than 1 Ω |
| A5-29(RR-) - chassis ground |
Always |
10 k Ω or more |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-31(RL+) - H12-2(RL+) |
Always |
Less than 1 Ω |
| A5-31(RL+) - chassis ground |
Always |
10 k Ω or more |
| A5-18(RL-) - H12-1(RL-) |
Always |
Less than 1 Ω |
| A5-18(RL-) - chassis ground |
Always |
10 k Ω or more |
NG
>Repair or replacement of wiring harness or connector
OK▼
15.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Malfunction reproduction test (Refer to )
)A▼
16.
Replacement of rear speed sensor
(1) Replace the relevant rear speed sensor with error code. (Refer to )
)Next▼
17.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Completed
A▼
18.
Replacement of speed sensor rotor
(1) Replace the relevant speed sensor rotor with error code. (Refer to )
)
NOTE:
The speed sensor rotor is assembled in the rear axle hub. Therefore, replace the rear axle hub.
Next▼
19.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Completed
| DTC | C1241 | Power supply voltage error |
|---|
Description of functions
If there is a malfunction in the power supply circuit, the skid control computer (brake actuator ASSY) outputs a diagnostic code and prohibits the operation by fail safe function.
If the voltage to the +BS terminal is not within the range of DTC detecting conditions due to a malfunctioning power supply or charging circuit (including battery and alternator circuits), this code will be stored in memory.
When the voltage to the +BS terminal returns to normal, this diagnostic code will be cleared.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1241 |
·The voltage applied to the +BS terminal continues 9.6V or less for 1 second or more, at the vehicle speed of 6 km/h or more. ·The voltage applied to the +BS terminal continues 6.9 V or less for 1 second or more, at the vehicle speed of 6 km/h or more. ·When the voltage of the +BS terminal is 9.6 V or more at the vehicle speed of 15 km/h or more and the skid control computer (brake actuator ASSY) starts the solenoid, the voltage of the solenoid relay has dropped significantly. |
·ABS No.2 fuse ·ECM IG1 fuse ·Battery ·Charging system ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Battery check
(1) Check the battery voltage.
Voltage
: 11 to 14 V
NG
>Check or replacement of battery or charging system (Refer to )
)OK▼
2.
Check wiring harness and connector (+BS, IG1, GND1, GND2 terminals)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-25(+BS) - chassis ground |
Always |
11 to 14 V |
| A5-28(IG1) - chassis ground |
IG ON |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-38(GND1) - chassis ground |
Always |
Less than 1 Ω |
| A5-13(GND2) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If there is a malfunction in GND1 and GND2 terminals, check the ground point for looseness.
NG
>Repair or replacement of wiring harness or connector
OK▼
3.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)| DTC | C1246 | Pressure sensor system |
|---|
Description of functions
The master cylinder pressure sensor is integrated into the brake actuator ASSY and connected to the skid control computer.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1246 |
·Voltage of the sensor signal is outside the specified range. ·The offset value of the sensor signal is outside the specified range. |
·STOP fuse ·Stop light switch circuit ·Wiring harness and connector ·Brake actuator ASSY (master cylinder pressure sensor circuit) ·Skid control computer (brake actuator ASSY) |
Circuit figure
For a circuit figure, refer to .
.Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Stop light illumination check
(1) Turn IG ON and depress the brake pedal to check that the stop light illuminates.
Criteria
: The stop light illuminates.
NG
>Stop light circuit check (Refer to )
)OK▼
2.
Check the Current Data Display (Master cylinder pressure)
(1) Using SSM3, check [Current Data Display] of [Master cylinder pressure]. (Refer to )
)
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Master cylinder pressure] |
Indicates the output value on the master pressure sensor. Display range: -1 to 23.99 Mpa |
While the brake pedal is being operated: It varies in proportion to depressing force. Brake pedal, not being operated: -1 to 0.5 MPa |
- |
Criteria
: Output value varies in proportion to the brake pedal depressing force.
NG
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)OK▼
3.
Check the Current Data Display (Stop Light Switch)
(1) Using SSM3, check [Current Data Display] of [Stop Lamp Switch]. (Refer to )
)SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Stop Lamp Switch] |
Indicates the stop light switch operation. Display range: OFF/ON |
OFF: Brake pedal, released ON: Brake pedal, depressed |
- |
Criteria
: According to the brake pedal operation, the display switches ON/OFF.
NG
> Go to step 5.
OK▼
4.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)5.
Check wiring harness and connector (noise filter - battery)
(1) Disconnect the connector, A13 of the noise filter.
NG
>Repair or replacement of wiring harness or connector
OK▼
6.
Noise filter check
(1) Check the noise filter. (Refer to )
)NG
>Repair or replacement of noise filter (Refer to )
)OK▼
7.
Check wiring harness and connector (noise filter - stop light switch ASSY)
(1) Disconnect the connector, A22 for the stop light switch ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
8.
Stop light switch ASSY check
(1) Check the stop light switch ASSY. (Refer to )
)NG
>Repair or replacement of stop light switch ASSY (Refer to )
)OK▼
9.
Check wiring harness and connector (STP terminal)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Measure the voltage between the terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-30(STP) - chassis ground |
Brake pedal, depressed |
11 to 14 V |
| A5-30(STP) - chassis ground |
Brake pedal, released |
Less than 1.5 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of skid control computer (brake actuator ASSY) (Refer to )
)| DTC | C1249 | BLS malfunction |
|---|
Description of functions
The skid control computer (brake actuator ASSY) inputs the stop light switch signal to input the brake operation conditions.
When the skid control computer (brake actuator ASSY) judges one of the followings, this diagnostic code will be stored in memory.
·Stop light switch ON/OFF, stuck
·Accelerator pedal and brake pedal, depressed simultaneously (*)
·Accelerator pedal and brake pedal, depressed simultaneously (*)
NOTE:
*: If the accelerator pedal and the brake pedal are depressed simultaneously, the skid control computer (brake actuator ASSY) judges that the stop light switch is stuck to ON and the diagnostic code may be stored in memory. However, this is not a malfunction.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1249 |
·The accelerator pedal has been ON and the brake has been OFF, at the vehicle speed of 10km/h or more. ·When the pressure inside the master cylinder increases with the stop light switch OFF. |
·STOP fuse ·Stop light switch ASSY ·Noise filter ·Wiring harness and connector ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Interview
(1) Interview the customer if the accelerator pedal and the brake pedal have been depressed simultaneously while driving and braking.
Criteria
: The acceleration pedal and the brake pedal were not depressed simultaneously.
NOTE:
·If the accelerator pedal and the brake pedal are depressed simultaneously, the skid control computer (brake actuator ASSY) judges that the stop light switch is stuck to ON and the diagnostic code may be stored in memory.
·If the accelerator pedal and the brake pedal have been depressed simultaneously, it is not a malfunction. Clear the diagnostic code. (Refer to)
·If the accelerator pedal and the brake pedal have been depressed simultaneously, it is not a malfunction. Clear the diagnostic code. (Refer to
)NG
>Complete
OK▼
2.
Stop light illumination check
NG
> Go to step 5.
OK▼
3.
Check the Current Data Display (Stop Light Switch)
(1) Using SSM3, check [Current Data Display] of [Stop Lamp Switch]. (Refer to )
)
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Stop Lamp Switch] |
Indicates the stop light switch operation. Display range: OFF/ON |
OFF: Brake pedal, released ON: Brake pedal, depressed |
- |
Criteria
: According to the brake pedal operation, the display switches ON/OFF.
NG
> Go to step 11.
OK▼
4.
Diagnostic code list recheck
(1) Drive at the speed of 10 km/h or more and stop the vehicle by depressing the brake pedal.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)5.
Check wiring harness and connector (noise filter - battery)
(1) Disconnect the noise filter connector (A13).
NG
>Repair or replacement of wiring harness or connector
OK▼
6.
Noise filter check
(1) Check the noise filter. (Refer to )
)NG
>Repair or replacement of noise filter (Refer to )
)OK▼
7.
Check wiring harness and connector (noise filter - stop light switch ASSY)
(1) Disconnect the connector, A22 for the stop light switch ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
8.
Stop light switch ASSY check
(1) Check the stop light switch ASSY. (Refer to )
)NG
>Repair or replacement of stop light switch ASSY (Refer to )
)OK▼
9.
Check wiring harness and connector (STP terminal)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Measure the voltage between the terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-30(STP) - chassis ground |
Brake pedal, depressed |
11 to 14 V |
| A5-30(STP) - chassis ground |
Brake pedal, released |
Less than 1.5 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
10.
Diagnostic code list recheck
(1) Drive at the speed of 10 km/h or more and stop the vehicle by depressing the brake pedal.
B
>Malfunction reproduction test (Refer to )
)A▼
To lighting system (How to troubleshoot) (Refer to )
)11.
Check wiring harness and connector (STP terminal)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Measure the voltage between the terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-30(STP) - chassis ground |
Brake pedal, depressed |
11 to 14 V |
| A5-30(STP) - chassis ground |
Brake pedal, released |
Less than 1.5 V |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of skid control computer (brake actuator ASSY) (Refer to )
)| DTC | C1288 | Different ECM specification |
|---|
Description of functions
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
| DTC | C1294 | AT error |
|---|
Description of functions
When an automatic transmission system error is input, this code will be output to illuminate the slip indicator light. (Vehicle stability control system is normal.)
Under the automatic transmission system error, TRC and Vehicle stability controls are prohibited for fail safe.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1294 |
Transmission error signal is received |
Transmission control computer |
Inspection steps
1.
Diagnostic code check (automatic transmission system)
B
>To automatic transmission system (diagnostic code list) (Refer to )
)A▼
Check and replacement of transmission control computer (Refer to )
)| DTC | C1300 | ECM |
|---|
Description of functions
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Replacement of skid control computer (brake actuator ASSY)
(1) Replace the skid control computer (brake actuator ASSY). (Refer to )
)Next▼
Complete
| DTC | C1330 | FR wheel speed sensor system open circuit/excessive input |
|---|
| DTC | C1331 | FL wheel speed sensor system open circuit/excessive input |
|---|
| DTC | C1464 | FR wheel speed sensor signal |
|---|
| DTC | C1465 | FL wheel speed sensor signal |
|---|
Description of functions
The speed sensor detects the wheel speed and sends the signal to the skid control computer (brake actuator ASSY). These signals are used for ABS control.
The speed sensor detects magnetic field changes in the magnetic rotor, where the N and S poles are evenly allocated in a circumferential direction, and generates a vehicle speed pulse.
With this vehicle speed pulse, the skid control computer (brake actuator ASSY) detects each wheel’s speed.
NOTE:
The following voltage outputs are the values when the vehicle harness connectors are connected to the skid control computer (brake actuator ASSY) and the speed sensor.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1330 C1331 |
Short circuit occurs in the power supply or the signal line of the speed sensor. |
·Front speed sensor ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
| C1464 C1465 |
·Signal values are outside the specified range when signals of the four speed sensors are compared. ·An abnormal wheel speed is detected. |
·Front speed sensor ·Front speed sensor, poor installation ·Wiring harness or connector ·Speed sensor rotor ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Check the Current Data Display (Wheel speed)
(1) Using SSM3, check [Current Data Display] of [Wheel speed] while driving straight at a speed of 10 km/h or more. (Refer to )
)
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Wheel Speed FR] |
Indicates the front right wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| [Wheel Speed FL] |
Indicates the front left wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
Criteria
: There is no big difference from the speed meter.
NG
> Go to step 3.
OK▼
2.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 3.
A▼
Malfunction reproduction test (Refer to )
)3.
Speed sensor installation condition check
NG
>Properly install the speed sensor or replace it.
OK▼
4.
Speed sensor check (foreign matter adhesion)
(1) Remove the speed sensor from the relevant wheel and check it for foreign matter adhesion or damage at the tip. (Refer to )
)
Criteria
: There is no foreign particles or damage.
CAUTION:
If there is no damage in the speed sensor through this check, do not replace the speed sensor.
NG
>Clean or replace the speed sensor.
OK▼
5.
Check wiring harness and connector (front speed sensor - brake actuator ASSY)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Disconnect the connector, A12 or A42 of the front speed sensor.
(4) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(5) Measure the resistance between the terminals.
Resistance
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-16(FR+) - A42-2(FR+) |
Always |
Less than 1 Ω |
| A5-16(FR+) - chassis ground |
Always |
10 k Ω or more |
| A5-4(FR-) - A42-1(FR-) |
Always |
Less than 1 Ω |
| A5-4(FR-) - chassis ground |
Always |
10 k Ω or more |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-19(FL+) - A12-2(FL+) |
Always |
Less than 1 Ω |
| A5-19(FL+) - chassis ground |
Always |
10 k Ω or more |
| A5-32(FL-) - A12-1(FL-) |
Always |
Less than 1 Ω |
| A5-32(FL-) - chassis ground |
Always |
10 k Ω or more |
NG
>Repair or replacement of wiring harness or connector
OK▼
6.
Skid control computer check (speed sensor power supply)
CAUTION:
With the front speed sensor connector connected, turn the ignition switch from OFF to ON, and then check the voltage.
(1) Measure the voltage between the terminal and chassis ground.
Voltage
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A42-2(FR+) - chassis ground |
IG ON |
8-14 V |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A12-2(FL+) - chassis ground |
IG ON |
8-14 V |
Captions in illustration
| *A |
RH |
| *B |
LH |
| *a |
Front side of vehicle wiring harness connector (Front speed sensor connector) |
NG
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)OK▼
7.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 8.
A▼
Malfunction reproduction test (Refer to )
)8.
Replacement of front speed sensor
(1) Replace the relevant front speed sensor with error code. (Refer to )
)Next▼
9.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 10.
A▼
Completed
10.
Replacement of speed sensor rotor
(1) Replace the relevant speed sensor rotor with error code. (Refer to )
)
NOTE:
The speed sensor rotor is assembled in the front axle hub. Therefore, replace the front axle hub.
Next▼
11.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Completed
| DTC | C1332 | RR wheel speed sensor system open circuit/excessive input |
|---|
| DTC | C1333 | RL wheel speed sensor system open circuit/excessive input |
|---|
| DTC | C1466 | RR wheel speed sensor signal |
|---|
| DTC | C1467 | RL wheel speed sensor signal |
|---|
Description of functions
The speed sensor detects the wheel speed and sends the signal to the skid control computer. These signals are used for ABS control.
The speed sensor detects magnetic field changes in the magnetic rotor, where the N and S poles are evenly allocated in a circumferential direction, and generates a vehicle speed pulse.
With this vehicle speed pulse, the skid control computer detects the speed for each wheel.
NOTE:
The following voltage outputs are the values when the vehicle harness connectors are connected to the skid control computer (brake actuator ASSY) and the speed sensor.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C1332 C1333 |
Short circuit occurs in the power supply or the signal line of the speed sensor. |
·Rear speed sensor ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
| C1466 C1467 |
·Signal values are outside the specified range when signals of the four speed sensors are compared. ·An abnormal wheel speed is detected. |
·Rear speed sensor ·Rear speed sensor, poor installation ·Wiring harness or connector ·Speed sensor rotor ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Check the Current Data Display (Wheel speed)
(1) Using SSM3, check [Current Data Display] of [Wheel speed] while driving straight at a speed of 10 km/h or more. (Refer to )
)
SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Item name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| Wheel speed RR |
Indicates the rear right wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
| Wheel speed RL |
Indicates the rear left wheel speed. Display range: 0 to 326.4 km/h |
When stopping: 0 km/h While driving at a stable speed: There is no big change. |
- |
Criteria
: There is no big difference from the speed meter.
NG
> Go to step 3.
OK▼
2.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 3.
A▼
Malfunction reproduction test (Refer to )
)3.
Speed sensor installation condition check
(1) Check installation condition of the speed sensor.
Criteria
: Properly installed.
Captions in illustration
| *a |
Normal |
| *b |
Malfunction |
NG
>Properly install the speed sensor or replace it.
OK▼
4.
Speed sensor check (foreign matter adhesion)
(1) Remove the speed sensor from the relevant wheel and check it for foreign matter adhesion or damage at the tip. (Refer to )
)
Criteria
: There is no foreign particles or damage.
CAUTION:
If there is no damage in the speed sensor through this check, do not replace the speed sensor.
NG
>Clean or replace the speed sensor.
OK▼
5.
Check wiring harness and connector (rear speed sensor brake actuator ASSY)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Disconnect the connector, G9 or H12 for the rear speed sensor.
(4) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(5) Measure the resistance between the terminals.
Resistance
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-17(RR+) - G9-2(RR+) |
Always |
Less than 1 Ω |
| A5-17(RR+) - chassis ground |
Always |
10 k Ω or more |
| A5-29(RR-) - G9-1(RR-) |
Always |
Less than 1 Ω |
| A5-29(RR-) - chassis ground |
Always |
10 k Ω or more |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-31(RL+) - H12-2(RL+) |
Always |
Less than 1 Ω |
| A5-31(RL+) - chassis ground |
Always |
10 k Ω or more |
| A5-18(RL-) - H12-1(RL-) |
Always |
Less than 1 Ω |
| A5-18(RL-) - chassis ground |
Always |
10 k Ω or more |
NG
>Repair or replacement of wiring harness or connector
OK▼
6.
Skid control computer check (speed sensor power supply)
CAUTION:
With the rear speed sensor connector connected, turn the ignition switch from OFF to ON, and then check the voltage.
(1) Measure the voltage between the terminal and chassis ground.
Voltage
RH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| G9-2(RR+) - chassis ground |
IG ON |
8-14 V |
LH
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| H12-2(RL+) - chassis ground |
IG ON |
8-14 V |
Captions in illustration
| *A |
RH |
| *B |
LH |
| *a |
Front side of vehicle wiring harness connector (Rear speed sensor connector) |
NG
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)OK▼
7.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 8.
A▼
Malfunction reproduction test (Refer to )
)8.
Replacement of rear speed sensor
(1) Replace the relevant rear speed sensor with error code. (Refer to )
)Next▼
9.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
> Go to step 10.
A▼
Completed
10.
Replacement of speed sensor rotor
(1) Replace the relevant speed sensor rotor with error code. (Refer to )
)
NOTE:
The speed sensor rotor is assembled in the rear axle hub. Therefore, replace the rear axle hub.
Next▼
11.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Completed
| DTC | C146C | Motor relay system |
|---|
Description of functions
The ABS motor relay is integrated into the brake actuator ASSY.
The skid control computer (brake actuator ASSY) turns on the ABS motor relay to operate the pump motor in the brake actuator ASSY while ABS, TRC, Vehicle stability control, or brake assist is operating.
If the power supply voltage for the ABS motor relay drops due to insufficient output of the battery or alternator, this code may be stored in memory.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C146C |
·When the motor relay is started, power is not supplied to the pump motor. ·When the motor relay is not operating, voltage inside the pump motor increases. ·Skid control computer (brake actuator ASSY) detects improper operation of the pump motor. |
·ABS No.1 fuse ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Check wiring harness and connector (motor relay power supply)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-1(+BM) - chassis ground |
Always |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-38(GND1) - chassis ground |
Always |
Less than 1 Ω |
| A5-13(GND2) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
2.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Turn IG OFF→ON, and drive for 30 seconds or more at the speed of 40km/h or more.
(3) If the ABS warning light illuminates, check the diagnostic code, using SSM3. (Refer to )
)
Result
| Result |
Go to |
|---|---|
| No output |
A |
| Output exists |
B |
NOTE:
·The skid control computer (brake actuator ASSY) self-diagnoses the motor relay circuit when IG is turned ON and the vehicle speed, 40 km/h has been input with the stop light switch turned OFF.
·If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator ASSY) to make sure that no error code is output.
·If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.
·If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator ASSY) to make sure that no error code is output.
·If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)| DTC | C146E | Valve relay system |
|---|
Description of functions
The ABS solenoid relay is integrated into the brake actuator ASSY and supply power to the ABS solenoid.
After turning IG ON, if the solenoid has been judged as normal by self-diagnosis during initial check, turn the relay ON. If open or short circuit has been detected, turn the relay OFF.
If the power supply voltage for the ABS solenoid relay drops due to insufficient output of the battery or alternator, this code may be stored in memory.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| C146E |
·The ABS solenoid relay driving circuit in the skid control computer (brake actuator ASSY) does not operate normally. ·The ABS solenoid relay cannot be turned ON/OFF. |
·ABS No.2 fuse ·Wiring harness or connector ·Skid control computer (brake actuator ASSY) |
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Check wiring harness and connector (solenoid relay power supply)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-25(+BS) - chassis ground |
Always |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-38(GND1) - chassis ground |
Always |
Less than 1 Ω |
| A5-13(GND2) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NG
>Repair or replacement of wiring harness or connector
OK▼
2.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Turn IG OFF→ON, and drive for 30 seconds or more at the speed of 40km/h or more.
(3) If the ABS warning light illuminates, check the diagnostic code, using SSM3. (Refer to )
)
Result
| Result |
Go to |
|---|---|
| No output |
A |
| Output exists |
B |
NOTE:
·The skid control computer (brake actuator ASSY) self-diagnose the solenoid relay circuit when IG is turned ON and the vehicle speed, 15 km/h has been input with the stop light switch turned OFF.
·If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator ASSY) to make sure that no error code is output.
·If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.
·If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator ASSY) to make sure that no error code is output.
·If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.
B
>Replacement of skid control computer (brake actuator ASSY) (Refer to )
)A▼
Malfunction reproduction test (Refer to )
)| DTC | U0073 | CAN failure·A system bus off detection |
|---|
| DTC | U0100 | Engine data, not received |
|---|
| DTC | U0101 | Transmission data, not received |
|---|
| DTC | U0126 | Steering angle sensor data, not received |
|---|
Description of functions
The skid control computer (brake actuator ASSY) inputs signals of the engine control computer, the transmission control computer, and the steering sensor through CAN communication.
| Diagnostic codes |
DTC detecting conditions |
Faulty part |
|---|---|---|
| U0073 |
The voltage at +BS terminal is between 9.6 to 16.5 V and bus off status continues for 0.1 second or more. |
CAN communication system |
| U0100 |
The vehicle is running and the voltage at +BS terminal is between 9.6 to 16.5 V, and the data transmission or reception to the engine control computer is impossible for 0.5 seconds or more. |
·CAN communication line ·Skid control computer (brake actuator ASSY) ·Engine control computer |
| U0101 |
The vehicle is running and the voltage at +BS terminal is between 9.6 to 16.5 V, and the data transmission or reception to the transmission control computer is impossible for 0.5 seconds or more. |
·CAN communication line ·Skid control computer (brake actuator ASSY) ·Transmission control computer |
| U0126 |
The vehicle is running and the voltage at +BS terminal is between 9.6 to 16.5 V, and the data reception from the steering sensor is impossible for 0.1 second or more. |
·CAN communication line ·Skid control computer (brake actuator ASSY) ·Steering sensor |
Inspection steps
1.
Diagnostic code list recheck
(1) Using SSM3, clear the diagnostic code. (Refer to )
)(2) Perform a driving test.
B
>Malfunction reproduction test (Refer to )
)A▼
To CAN communication system (How to troubleshoot) (Refer to )
)| ABS warning light remains ON |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication.
When one of the following conditions is detected, the ABS warning light illuminates.
·The skid control ECM connector is disconnected from the skid control ECM.
·The skid control ECM has trouble in its internal circuit.
·Wiring harness between the combination meter ASSY and the skid control ECM are open.
·ABS control system is defective.
·The skid control ECM has trouble in its internal circuit.
·Wiring harness between the combination meter ASSY and the skid control ECM are open.
·ABS control system is defective.
NOTE:
When the skid control ECM has trouble, in some cases the SSM3 may not be useful.
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Inspection of connection for each part
(1) Lightly shake the connectors and the wiring harness of the skid control computer (brake actuator ASSY) up/down/left/right, and check the illumination status for the ABS warning light.
Criteria
: The ABS warning light status does not change.
NG
>Repair or replacement of wiring harness or connector
OK▼
2.
Diagnostic code check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
3.
Check wiring harness and connector (+BS, IG1, GND1, GND2 terminals)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-25(+BS) - chassis ground |
Always |
11 to 14 V |
| A5-28(IG1) - chassis ground |
IG ON |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-38(GND1) - chassis ground |
Always |
Less than 1 Ω |
| A5-13(GND2) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If there is a malfunction in GND1 and GND2 terminals, check the ground point for looseness.
NG
>Repair or replacement of wiring harness or connector
OK▼
To meter & gauge system (How to troubleshoot) (Refer to )
)| The ABS warning light does not illuminate. |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication.
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
ABS warning light check
(1) Disconnect the skid control ECM connector.
(2) Turn the ignition switch to ON.
(3) Check that the ABS warning light illuminates.
Criteria
: The ABS warning light illuminates.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
> Go to step 3.
OK▼
Currently normal
3.
Combination meter ASSY check
(1) Turn the ignition switch to OFF.
(2) Reconnect the skid control ECM connector.
(3) Start the engine.
(4) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(5) Check the combination meter ASSY.
Criteria
: In response to SSM3 operation, the ABS warning light turns ON/OFF.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY
| Brake warning light remains ON |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication.
When one of the following conditions is detected, the brake warning light illuminates.
·The skid control ECM connector is disconnected from the skid control ECM.
·The brake fluid level is insufficient.
·The parking brake is being applied.
·EBD control is not allowed.
·The brake fluid level is insufficient.
·The parking brake is being applied.
·EBD control is not allowed.
Circuit figure
Inspection steps
CAUTION:
·When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
·Before performing troubleshooting, check the fuse for this circuit.
)·Before performing troubleshooting, check the fuse for this circuit.
1.
Preliminary inspection
(1) Make sure that the following conditions for turning off the brake warning light are met.
(a) The ABS warning light is OFF.
(b) The brake fluid is sufficient in the brake master cylinder reservoir.
(c) The parking brake is completely released.
Next▼
2.
Inspection of connection for each part
(1) Lightly shake the connectors and the wiring harness at eat part up/down/left/right, to check the illumination status for the brake warning light.
Criteria
: The brake warning light status does not change.
NOTE:
If the warning light illumination status changes when shaking the connectors and the wires of the skid control computer (brake actuator ASSY), check the terminals for poor connections.
NG
>Repair or replacement of wiring harness or connector
OK▼
3.
Diagnostic code check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
4.
Check wiring harness and connector (+BS, IG1, GND1, GND2 terminals)
(1) Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.
Criteria
: No trouble
(2) Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
(3) Check the case and terminal of the connector for deformation and/or corrosion.
Criteria
: No deformation or corrosion.
(4) Check the voltage and resistance between terminals.
Voltage
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-25(+BS) - chassis ground |
Always |
11 to 14 V |
| A5-28(IG1) - chassis ground |
IG ON |
11 to 14 V |
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| A5-38(GND1) - chassis ground |
Always |
Less than 1 Ω |
| A5-13(GND2) - chassis ground |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If there is a malfunction in GND1 and GND2 terminals, check the ground point for looseness.
NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Parking brake switch ASSY check
(1) Check the parking brake switch ASSY. (Refer to )
)NG
>Replacement of parking brake switch ASSY (Refer to )
)OK▼
6.
Check wiring harness and connector (Main body ECM (network gateway computer) - parking brake switch ASSY)
(1) Turn IG OFF and disconnect the connector (3B) for the main body ECM (network gateway computer).
(2) Disconnect the connector, D31 for the parking brake switch ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
7.
Brake master cylinder SUB-ASSY check (fluid level warning switch)
(1) With the brake fluid at a specified level, disconnect the connector (A59) for the fluid level warning switch (brake master cylinder reservoir SUB-ASSY), and check the brake warning light status.
Result
| Result |
Go to |
|---|---|
| The brake warning light does not go off. |
A |
| The brake warning light goes off. |
B |
NOTE:
If the warning light goes off, the fluid level warning switch (brake master cylinder reservoir SUB-ASSY) is internally shorted.
B
>Replacement of brake master cylinder SUB-ASSY (Refer to )
)A▼
8.
Check wiring harness and connector (fluid level warning switch - combination meter ASSY and chassis ground)
(1) Turn the ignition switch to OFF, and then disconnect the connector (D7) for the combination meter ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
To meter & gauge system (How to troubleshoot) (Refer to )
)| The brake warning light does not illuminate. |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication.
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code check (CAN communication system)
B
>CAN communication system check (Refer to )
)A▼
2.
Brake warning light check
(1) Disconnect the skid control ECM connector.
(2) Turn the ignition switch to ON.
(3) Check that the brake warning light illuminates.
Criteria
: Check that the brake warning light illuminates (for 3 seconds).
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
> Go to step 3.
OK▼
Currently normal
3.
Combination meter ASSY check
(1) Turn the ignition switch to OFF.
(2) Reconnect the skid control ECM connector.
(3) Start the engine.
(4) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(5) Check the combination meter ASSY.
Criteria
: In response to the SSM3 operation, the brake warning light turns ON/OFF.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)| TRC OFF indicator light remains ON/TRC OFF indicator light does not illuminate. |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication. When the Vehicle stability control OFF switch is pressed, TRC is turned to OFF. When this switch is kept pressed, TRC and Vehicle stability control are turned to OFF. When TRC switches to OFF, the TRC OFF indicator light illuminates.
Wiring diagram
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
Inspection of skid control ECM connector connection
(1) Check if the skid control ECM connector is properly connected.
Criteria
: The connector is properly connected.
NG
>Properly connect the connector to the ECM.
OK▼
3.
Check the battery.
(1) Check the battery voltage.
Standard voltage
: 11 to 14 V
NG
>Check or replace charging system components or battery (Refer to )
)OK▼
4.
Check the Current Data Display (TRC/VSC OFF mode)
(1) Connect the SSM3 to the DLC3.
(2) Start the engine.
(3) Using SSM3, check [Current Data Display] of [TRC/VSC OFF Mode]. (Refer to )
)SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Tester display |
Measured item/Range |
Normal condition |
Notes for diagnosis |
|---|---|---|---|
| [TRC/VSC OFF Mode] |
TRC/Vehicle stability control OFF Mode/Normal mode, TRC OFF mode, VSC OFF mode |
Normal Mode: Normal mode TRC OFF Mode: TRC OFF mode VSC OFF Mode: Vehicle stability control OFF mode |
- |
(4) Using SSM3, make sure that the state of the switch displayed in SSM3 changes depending on the Vehicle stability control OFF switch operation.
Criteria
: The display of the SSM3 changes depending on the operation of Vehicle stability control OFF switch.
NG
> Go to step 6.
OK▼
5.
Combination meter ASSY check
(1) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(2) Check the combination meter ASSY.
Criteria
: TRC OFF indicator light turns ON/OFF in response to SSM3 operation.
NOTE:
If this page is referred while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)6.
Vehicle stability control OFF switch check
(1) Check the Vehicle stability control OFF switch. (Refer to )
)NG
>Replacement of Vehicle stability control OFF switch (Refer to )
)OK▼
7.
Harness and connector check (skid control ECM - Vehicle stability control OFF switch)
(1) Disconnect the skid control ECM connector.
(2) Measure the resistance according to the following table.
Normal resistance
| Tester connection |
Condition |
Specific condition |
|---|---|---|
| A5-12 (CSW) - D35-5 |
Always |
1 Ω or less |
| A5-12(CSW) - chassis ground |
Always |
10 k Ω or more |
| D35-8 - chassis ground |
Always |
1 Ω or less |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of brake actuator ASSY (Refer to )
)| Vehicle stability control OFF indicator light remains ON/Vehicle stability control OFF indicator light does not illuminate |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication. When the Vehicle stability control OFF switch is pressed, TRC is turned to OFF. When this switch is kept pressed, TRC and Vehicle stability control are turned to OFF. When TRC switches to OFF, the TRC OFF indicator light illuminates.
Wiring diagram
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code output check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
Inspection of skid control ECM connector connection
(1) Check if the skid control ECM connector is properly connected.
Criteria
: The connector is properly connected.
NG
>Properly connect the connector to the ECM.
OK▼
3.
Check the battery.
(1) Check the battery voltage.
Standard voltage
: 11 to 14 V
NG
>Check or replace charging system components or battery (Refer to )
)OK▼
4.
Check the Current Data Display (TRC/VSC OFF mode)
(1) Connect the SSM3 to the DLC3.
(2) Start the engine.
(3) Using SSM3, check [Current Data Display] of [TRC/VSC OFF Mode]. (Refer to )
)SSM3 screen: [Chassis]→[ABS/VDC System]→[Current Data Display & Save]
| Tester display |
Measured item/Range |
Normal condition |
Notes for diagnosis |
|---|---|---|---|
| [TRC/VSC OFF Mode] |
TRC/Vehicle stability control OFF Mode/Normal mode, TRC OFF mode, VSC OFF mode |
Normal: Normal mode TRC OFF: TRC OFF mode VSC OFF: Vehicle stability control OFF mode |
- |
(4) Using SSM3, make sure that the state of the switch displayed in SSM3 changes depending on the Vehicle stability control OFF switch operation.
Criteria
: The display of the SSM3 changes depending on the operation of Vehicle stability control OFF switch.
NG
> Go to step 6.
OK▼
5.
Combination meter ASSY check
(1) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(2) Check the combination meter ASSY.
Criteria
: Vehicle stability control OFF indicator light is turned ON or OFF depending on the SSM3 operation.
NOTE:
If this page is referred while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)6.
Vehicle stability control OFF switch check
(1) Check the Vehicle stability control OFF switch. (Refer to )
)NG
>Replacement of Vehicle stability control OFF switch (Refer to )
)OK▼
7.
Harness and connector check (skid control ECM - Vehicle stability control OFF switch)
(1) Disconnect the skid control ECM connector.
(2) Measure the resistance according to the following table.
Normal resistance
| Tester connection |
Condition |
Specific condition |
|---|---|---|
| A5-12 (CSW) - D35-5 |
Always |
1 Ω or less |
| A5-12(CSW) - chassis ground |
Always |
10 k Ω or more |
| D35-8 - chassis ground |
Always |
1 Ω or less |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of brake actuator ASSY (Refer to )
)| Vehicle stability control SPORT indicator light remains ON/Vehicle stability control SPORT indicator light does not illuminate |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication. The system is switched between Normal mode and SPORT mode each time Vehicle stability control SPORT switch is pressed. When Vehicle stability control SPORT switch is pressed in SPORT mode, the system switches to Normal mode.
Wiring diagram
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code output check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
Inspection of skid control ECM connector connection
(1) Check if the skid control ECM connector is properly connected.
Criteria
: The connector is properly connected.
NG
>Properly connect the connector to the ECM.
OK▼
3.
Check the battery.
(1) Check the battery voltage.
Standard voltage
: 11 to 14 V
NG
>Check or replace charging system components or battery (Refer to )
)OK▼
4.
Check the Current Data Display (VSC SPORT mode)
(1) Connect the SSM3 to the DLC3.
(2) Start the engine.
(3) Using SSM3, check [Current Data Display] of [VSC SPORT MODE]. (Refer to )
)SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]
| Tester display |
Measured item/Range |
Normal condition |
Notes for diagnosis |
|---|---|---|---|
| VSC SPORT mode |
Vehicle stability control SPORT mode / Normal or Sports |
Normal: Normal mode Sports: Vehicle stability control SPORT mode |
- |
(4) Using SSM3, make sure that the state of the switch displayed in SSM3 changes depending on the Vehicle stability control SPORT switch operation.
Criteria
: The display of the SSM3 changes depending on the operation of Vehicle stability control SPORT switch.
NG
> Go to step 6.
OK▼
5.
Combination meter ASSY check
(1) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(2) Check the combination meter ASSY.
Criteria
: Vehicle stability control SPORT indicator light is turned ON or OFF depending on the SSM3 operation.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)6.
Vehicle stability control SPORT switch check
(1) Check the Vehicle stability control SPORT switch. (Refer to )
)NG
>Replacement of Vehicle stability control SPORT switch (Refer to )
)OK▼
7.
Harness and connector check (skid control ECM - Vehicle stability control SPORT switch)
(1) Disconnect the skid control ECM connector.
(2) Measure the resistance according to the following table.
Normal resistance
| Tester connection |
Condition |
Specific condition |
|---|---|---|
| A5-27 (CSW) - D35-5 |
Always |
1 Ω or less |
| A5-27(CSW) - chassis ground |
Always |
10 k Ω or more |
| D35-8 - chassis ground |
Always |
1 Ω or less |
Captions in illustration
| *a |
Front side of vehicle wiring harness connector (Skid control computer (brake actuator ASSY)- connector) |
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Repair or replacement of wiring harness or connector
OK▼
Replacement of brake actuator ASSY (Refer to )
)| Slip indicator light remains ON |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication. When Vehicle stability control and/or TRC is active, the slip indicator light flashes. When a malfunction is detected, the slip indicator light illuminates and the driver is warned of the condition.
Wiring diagram
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code output check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
Inspection of skid control ECM connector connection
(1) Check if the skid control ECM connector is properly connected.
Criteria
: The connector is properly connected.
NG
>Properly connect the connector to the ECM.
OK▼
3.
Check the battery.
(1) Check the battery voltage.
Standard voltage
: 11 to 14 V
NG
>Check or replace charging system components or battery (Refer to )
)OK▼
4.
Combination meter ASSY check
(1) Start the engine.
(2) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(3) Check the combination meter ASSY.
Criteria
: In response to the SSM3 operation, the slip indicator light turns ON/OFF.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)| The slip indicator light does not illuminate. |
|---|
Description of functions
The skid control ECM is connected to the combination meter ASSY through the CAN communication.
Inspection steps
CAUTION:
When the skid control ECM (brake actuator ASSY) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to )
)1.
Diagnostic code output check (CAN communication system)
B
>To CAN communication system (How to troubleshoot) (Refer to )
)A▼
2.
Combination meter ASSY check
(1) Turn the ignition switch to OFF.
(2) Using SSM3, display [System Operation Check Mode] of the combination meter ASSY (meter CPU). (Refer to )
)(3) Check the combination meter ASSY.
Criteria
: In response to the SSM3 operation, the slip indicator light turns ON/OFF.
NOTE:
If this page is referenced while performing troubleshooting described in the symptom table, go back to the table and go to the next step before replacing parts. (Refer to )
)NG
>Replacement of combination meter ASSY (Refer to )
)OK▼
Replacement of brake actuator ASSY (Refer to )
)