- Front speed sensor RH
- Front speed sensor LH
- Harness or connector
- Speed sensor rotor
- Sensor installation
- Master cylinder solenoid (Skid control ECU)
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Brake | Section: Brake Control/Dynamic Control System | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM00000252O00AX |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
C0200/31 |
Front Speed Sensor RH Circuit |
|
DTC |
C0205/32 |
Front Speed Sensor LH Circuit |
|
DTC |
C1235/35 |
Foreign Object is Attached on Tip of Front Speed Sensor RH |
|
DTC |
C1236/36 |
Foreign Object is Attached on Tip of Front Speed Sensor LH |
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the Multi-terrain ABS, EBD, BA, VSC, A-TRAC, CRAWL and hill-start assist control systems. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.
To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the skid control ECU.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C0200/31 C0205/32 |
When any of the following conditions is detected: 1. At a vehicle speed of 10 km/h (6 mph) or more, the pulses are not input for 1 second. 2. A momentary interruption of the speed sensor signal occurs at least 255 times when switching the engine switch on (IG) and off. 3. Continuous noise occurs in the speed sensor signals at a vehicle speed of 20 km/h (12 mph) or more. 4. The speed sensor signal circuit is open for 0.12 seconds or more. |
|
|
C1235/35 C1236/36 |
Noise in the speed sensor signals occurs 75 times or more for 5 seconds when the vehicle speed is 20 km/h (12 mph) or more. |
|
HINT:
- DTC C0200/31 and C1235/35 are for the front speed sensor RH.
- DTC C0205/32 and C1236/36 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration
.
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (FR/FL SPEED OPEN) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FR Speed Open |
Front speed sensor RH open detection/ERROR or NORMAL |
ERROR: Momentary interruption NORMAL: Normal |
- |
|
FL Speed Open |
Front speed sensor LH open detection/ERROR or NORMAL |
ERROR: Momentary interruption NORMAL: Normal |
- |
(d) Check for any momentary interruption in the wire harness and connector corresponding to the DTC
.
OK:
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the sensor and connector.
|
|
2. |
READ VALUE USING TECHSTREAM (FR/FL WHEEL SPEED, FR/FL WHEEL DIRECTION) |
(a) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FR Wheel Speed |
Front wheel speed sensor RH reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) |
Actual wheel speed |
A similar speed is indicated on the speedometer. |
|
FL Wheel Speed |
Front wheel speed sensor LH reading/min.: 0 km/h (0 mph), max.: 326 km/h (202 mph) |
Actual wheel speed |
A similar speed is indicated on the speedometer. |
OK:
The speed value output from the speed sensor displayed on the Techstream is the same as the actual vehicle speed.
(b) Check that the sensor signal conforms to the wheel direction.
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FR Wheel Direction |
Front wheel direction RH / FORWARD or BACK |
FORWARD: Forward BACK: Back |
- |
|
FL Wheel Direction |
Front wheel direction LH / FORWARD or BACK |
FORWARD: Forward BACK: Back |
- |
OK:
The wheel direction is displayed correctly.
|
|
3. |
PERFORM SIGNAL CHECK |
(a) Check if test mode (signal check) DTCs are output.
HINT:
Enter the following menus: Chassis / ABS/VSC/TRAC / Utility / Signal Check.
Result
|
Result |
Proceed to |
|---|---|
|
Test mode (signal check) DTC is output. |
A |
|
Test mode (signal check) DTC is not output. |
B |
|
|
4. |
INSPECT FRONT SPEED SENSOR INSTALLATION |
|
(a) Check the speed sensor installation. OK: The installation bolt is tightened properly. There is no clearance between the sensor and front steering knuckle. |
Torque: 8.3 N·m (85 kgf·cm, 73 in·lbf)
NOTICE:
Check the speed sensor signal after replacement
.
|
|
5. |
INSPECT SPEED SENSOR TIP |
(a) Remove the front speed sensor
.
(b) Check the sensor tip.
OK:
No scratches or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning/replacement
.
|
|
6. |
INSPECT FRONT SPEED SENSOR |
|
(a) Install the front speed sensor. |
(b) Turn the engine switch off.
(c) Disconnect the z17 and/or z18 front speed sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
z17-2 (FR+) - Body ground |
Engine switch off |
10 kΩ or higher |
|
z17-1 (FR-) - Body ground |
Engine switch off |
10 kΩ or higher |
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
z18-2 (FL+) - Body ground |
Engine switch off |
10 kΩ or higher |
|
z18-1 (FL-) - Body ground |
Engine switch off |
10 kΩ or higher |
|
|
7. |
INSPECT SKID CONTROL SENSOR WIRE |
|
(a) Disconnect the z17 and Az2/z18 and Az1 skid control sensor wire connectors. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z17 ("A"-2) - Az2 ("B"-5) |
Always |
Below 1 Ω |
|
z17 ("A"-2) - Az2 ("B"-1) |
Always |
10 kΩ or higher |
|
z17 ("A"-2) - Body ground |
Always |
10 kΩ or higher |
|
z17 ("A"-1) - Az2 ("B"-1) |
Always |
Below 1 Ω |
|
z17 ("A"-1) - Az2 ("B"-5) |
Always |
10 kΩ or higher |
|
z17 ("A"-1) - Body ground |
Always |
10 kΩ or higher |
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z18 ("A"-2) - Az1 ("B"-5) |
Always |
Below 1 Ω |
|
z18 ("A"-2) - Az1 ("B"-1) |
Always |
10 kΩ or higher |
|
z18 ("A"-2) - Body ground |
Always |
10 kΩ or higher |
|
z18 ("A"-1) - Az1 ("B"-1) |
Always |
Below 1 Ω |
|
z18 ("A"-1) - Az1 ("B"-5) |
Always |
10 kΩ or higher |
|
z18 ("A"-1) - Body ground |
Always |
10 kΩ or higher |
NOTICE:
Check the speed sensor signal after replacement
.
|
|
8. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) |
|
(a) Disconnect the A24 skid control ECU connector and z17/z18 front speed sensor connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A24-3 (FR+) - z17-2 (FR+) |
Always |
Below 1 Ω |
|
A24-3 (FR+) - Body ground |
Always |
10 kΩ or higher |
|
A24-17 (FR-) - z17-1 (FR-) |
Always |
Below 1 Ω |
|
A24-17 (FR-) - Body ground |
Always |
10 kΩ or higher |
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A24-18 (FL+) - z18-2 (FL+) |
Always |
Below 1 Ω |
|
A24-18 (FL+) - Body ground |
Always |
10 kΩ or higher |
|
A24-4 (FL-) - z18-1 (FL-) |
Always |
Below 1 Ω |
|
A24-4 (FL-) - Body ground |
Always |
10 kΩ or higher |
|
|
9. |
INSPECT MASTER CYLINDER SOLENOID (SKID CONTROL ECU OUTPUT VOLTAGE) |
|
(a) Reconnect the A24 skid control ECU connector. |
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
for LH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
z17-2 (FR+) - Body ground |
Engine switch on (IG) |
7.5 to 12 V |
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
z18-2 (FL+) - Body ground |
Engine switch on (IG) |
7.5 to 12 V |
|
|
10. |
RECONFIRM DTC |
(a) Clear the DTCs
.
(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.
(c) Check if the same DTCs are output
.
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is output. |
A |
|
DTC is not output (When troubleshooting in accordance with the Diagnostic Trouble Code Chart). |
B |
|
DTC is not output (When troubleshooting in accordance with the Problem Symptoms Table). |
C |
|
|
11. |
REPLACE FRONT SPEED SENSOR |
(a) Replace the front speed sensor
.
NOTICE:
Check the speed sensor signal after replacement
.
|
|
12. |
RECONFIRM DTC |
(a) Clear the DTCs
.
(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.
(c) Check if the same DTCs are output
.
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC is output. |
A |
|
DTC is not output. |
B |
|
|
13. |
INSPECT SPEED SENSOR ROTOR |
(a) Remove the front axle hub sub-assembly
.
(b) Check the sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
NOTICE:
Check the speed sensor signal after cleaning/replacement
.
|
|
|