Engine immobilizer system (with entry & start system)
Precautions Parts location System information Troubleshooting Diagnostic trouble codes
ANTI-THEFT SYSTEM / SMART ENTRY & START SYSTEM
ENGINE IMMOBILIZER SYSTEM (WITH ENTRY & START SYSTEM)
PRECAUTIONS
1. Notes for registration
(1) When replacing any of the following parts, refer to the “immobilizer registration manual”.
CAUTION:
·When replacing the collation ECM (smart key ECM ASSY), it is also necessary to prepare all the registered electrical key transmitter SUB-ASSYs.
·It is not possible to use a registered electrical key transmitter SUB-ASSY or ECM in a different vehicle.
·It is not possible to use a registered electrical key transmitter SUB-ASSY or ECM in a different vehicle.
(a) Collation ECM (smart key ECM ASSY)
(b) ID code box (immobilizer code ECM)*
(c) Steering lock actuator ASSY (steering lock ECM)
(d) ECM
(e) Electrical key transmitter SUB-ASSY
*: The ID code box is included.
2. Precautions for battery
(1) Immediately after the battery cable disconnection and re-connection, the entry unlock function may not operate. In this case, the entry unlock function returns by performing the wireless door lock and unlock.
(2) After battery cable disconnection and re-connection, the engine may not start immediately when trying to start. In this case, turn of the engine switch. On 2nd try, the engine can start normally.
(3) The vehicle records the power supply mode continuously. If you remove and then reconnect the battery cable, the power returns to the mode it was before you removed the cable. Always turn off the engine switch, before disconnecting the battery cable.
CAUTION:
With the battery run-out condition, if you do not know the power supply mode before cable disconnection, be very careful when re-connecting the battery cable.
PARTS LOCATION
CIRCUIT FIGURE
Functions of the main parts
| Parts |
Function |
|---|---|
| Collation ECM (smart key ECM ASSY) |
·This identifies and confirms the ID code from the door control receiver and sends the signal to the steering lock actuator ASSY (steering lock ECM) according to the operation function. ·This performs the code communication of ID code box (immobilizer code ECM) and steering lock actuator ASSY (steering lock ECM) during engine starting. * 1 ·This performs the code communication with the steering lock actuator ASSY (steering lock ECM) during engine starting. * 2 |
| Engine switch |
·This sends the engine switch operation signal to the collation ECM (smart key ECM ASSY). ·This sends the ID code to the collation ECM (smart key ECM ASSY) after receiving ID code from the key, when the transmitter battery is run-out, using the built-in transporter key amplifier (smart key ECM ASSY). |
| ID code box (immobilizer code ECM)*1 |
This sends the immobilizer set/not set command to the ECM after receiving it from the collation ECM (smart key ECM ASSY) via LIN communication. |
| ECM |
This starts the engine after receiving the immobilizer not set command from the ID box (immobilizer code ECM)*1 or the collation ECM (smart key ECM ASSY)*2 or after receiving the engine start request signal from the collation ECM (smart key ECM ASSY). |
| Steering lock actuator ASSY (steering lock ECM) |
This unlocks the steering lock after receiving the steering lock/unlock signal from the collation ECM (smart key ECM ASSY) or ID code box (immobilizer code ECM). * 1 This unlocks the steering lock after receiving the steering lock/unlock signal from the collation ECM (smart key ECM ASSY). * 2 |
*1: The ID code box is included.
*2: The ID code box is not included.
*2: The ID code box is not included.
DESCRIPTION OF FUNCTIONS
1. Description of engine immobilizer system
(1) The engine immobilizer system judges the EFI system starting capability, based on the key ID code and the code already registered to the vehicle. The engine immobilizer system compares the ID code registered in vehicle collation ECM (smart key ECM ASSY) with the transponder chip ID code built in the electrical key transmitter SUB-ASSY. If these ID codes do not match, the engine immobilizer system operates and EFI system can not be started. The collation ECM (smart key ECM ASSY) controls the communication with the EFI system, steering lock actuator ASSY (steering lock ECM), ID code box (immobilizer code ECM)*. If ID codes of the transponder chip and ECM (smart key ECM ASSY) match, the collation ECM (smart key ECM ASSY) permits the EFI system starting.
*: The ID code box is included.
2. System functions
(1) Push button start function
(a) When the driver (or passenger) enters inside the vehicle while holding the electrical key transmitter SUB-ASSY, and depresses the brake pedal*1 or clutch pedal*2, the collation ECM (smart key ECM ASSY) recognizes that the brake pedal*1 or clutch pedal*2 is depressed, and sends the electrical key transmitter SUB-ASSY collation request signal to the inside vehicle electrical key antenna. When the request signal is received, the inside vehicle electrical key antenna sends other signal to detect whether the electrical key transmitter SUB-ASSY is inside the vehicle. When the electrical key transmitter SUB-ASSY receives this request signal, it returns the ID code including the response code. The ID code sent from the electrical key transmitter SUB-ASSY is sent to the collation ECM (smart key ECM ASSY) via the door control receiver. When the ID code is received, the collation ECM (smart key ECM ASSY) analyzes the code. If the collation result is normal, the entry key indicator light in the combination meter ASSY illuminates in green. When the indicator lights up green and the driver pushes the engine switch, the collation ECM (smart key ECM ASSY) recognizes the engine start signal, and turns on the ACC relay and IG1 relay and IG2 relay respectively. At this time, it recognizes that the power supply mode of the collation ECM (smart key ECM ASSY) has been changed, and sends the electrical power to the steering lock actuator. Then, (via the ID code box (immobilizer code ECM))*3 the steering lock actuator ASSY (steering lock ECM) recognizes that the collation ECM (smart key ECM ASSY) is the suitable ECM and drives the steering actuator motor until the steering lock unlocks.) When the steering lock is unlocked, the steering lock actuator ASSY (steering lock ECM) transmits an unlock completion signal to the collation ECM (smart key ECM ASSY). If there is an ID code box, when this signal is received, the collation ECM (smart key ECM ASSY) sends the immobilizer not set command signal to the ID code box (immobilizer code ECM). When this signal is received, the ID code box (immobilizer code ECM) sends the immobilizer not set command signal to the EFI system after confirming that the collation ECM (smart key ECM ASSY) is the suitable ECM. If there is no ID code box, when this signal is received, the collation ECM (smart key ECM ASSY) sends the immobilizer not set command signal to the EFI system.
*1: With automatic transmission
*2: for manual transmission
*3: The ID code box is included.
*4: The ID code box is not included.
*2: for manual transmission
*3: The ID code box is included.
*4: The ID code box is not included.
HOW TO PROCEED WITH TROUBLESHOOTING
NOTE:
·Use these procedures to troubleshoot the engine immobiliser system.
·*: Use the SSM3.
·*: Use the SSM3.
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT▼
2.
INSPECT BATTERY VOLTAGE
Standard voltage
: 11 to 14 V
If the voltage is below 11V, recharge or replace the battery before proceeding.
NOTE:
A simple method to determine whether the battery is depleted is to operate the horn.
NEXT▼
3.
TURN ENGINE SWITCH ON (IG)
NEXT▼
4.
Communication function inspection of the CAN communication system
(1) Check CAN communication system. (Refer to 
)
)
B
>Go to “CAN communication system (How to troubleshoot)” (Refer to ).
).A▼
5.
Communication function inspection of large-scale multiplex communication system for vehicle body [LIN]
(1) Perform a function check of the large-scale multiplex communication system for vehicle body [LIN] to see that no abnormal condition is present in the communication system. (Refer to )
)
B
>To Large-scale multiplex communication system for vehicle body [LIN] (How to troubleshoot) (Refer to )
)A▼
6.
CHECK FOR DTC (ENTRY AND START SYSTEM)*
(1) Check for DTCs and make a note of any codes that are output.
(2) Clear the DTCs. (See page )
)(3) Recheck for DTCs. Based on the DTCs output above, try to duplicate the engine immobiliser system DTC or steering lock system DTC by simulating the symptoms indicated by the DTCs.
B
>Go to “steering lock system (List of diagnostic codes)” (Refer to )
)C
>GO TO DIAGNOSTIC TROUBLE CODE CHART (See page )
)A▼
7.
CHECK FOR DTC (ECD SYSTEM OR EFI SYSTEM)*
(1) Clear the DTCs. (Refer to )
) (2) Check for DTCs. (Refer to )
)
NOTE:
The DTCs for the engine immobiliser system are specified above. If other codes are output, check the DTC chart for the EFI system.
B
>GO TO DIAGNOSTIC TROUBLE CODE CHART (See page )
)C
>To EFI system (list of diagnostic codes) (Refer to )
)A▼
8.
PROBLEM SYMPTOMS TABLE
(1) Refer to Problem Symptoms Table. (See page )
)
B
>Go to step 10
A▼
9.
OVERALL ANALYSIS AND TROUBLESHOOTING*
(1) Check current data display & save / system operation check mode. (Refer to )
)(2) Check Terminals of ECU. (See page)
)NEXT▼
10.
ADJUST, REPAIR OR REPLACE
NEXT▼
11.
CHECK FOR DTC*
(1) Clear the DTCs. (See page)
)(2) Check for DTCs. (See page)
)
NOTE:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" of each diagnostic procedure. (See page)
)B
>GO TO DIAGNOSTIC TROUBLE CODE CHART (See page ).
).A▼
END
PROBLEM SYMPTOMS TABLE
NOTE:
·Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
·Inspect the fuses and relays related to this system before inspecting the suspected areas below.
·If the problem only occurs in certain locations or at certain times of day, check for wave interference.
·If the vehicle components are added, check for wave interference from the added components.
·Inspect the fuses and relays related to this system before inspecting the suspected areas below.
·If the problem only occurs in certain locations or at certain times of day, check for wave interference.
·If the vehicle components are added, check for wave interference from the added components.
Engine Immobiliser System
| Symptom |
Suspected Area |
See page |
|---|---|---|
| Engine cannot be started*1 |
Certification ECU (smart key ECU assembly) |
- |
| Engine cannot be started*2 |
ID code box (immobiliser code ECU)*1 |
|
| ECM |
|
|
| EFI system |
|
|
| Power source mode cannot be changed*2 |
Engine switch |
|
| Certification ECU (smart key ECU assembly) |
|
|
| Steering lock lock/unlock not possible*3 |
Steering lock actuator assembly (steering lock ECU) |
|
*1: w/ ID Code Box
*2: Refer to Problem Symptoms Table for Entry and Start System (for Start Function) (Refer to)
*3: Refer to Problem Symptoms Table for Steering Lock System (Refer to)
*2: Refer to Problem Symptoms Table for Entry and Start System (for Start Function) (Refer to
)*3: Refer to Problem Symptoms Table for Steering Lock System (Refer to
)ECM TERMINAL ARRANGEMENT
1. Check the engine switch.
(1) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D25-6 (AGND) - Chassis ground |
- |
Transponder key amplifier GND-output short |
Always |
1 Ω or less |
- |
| D25-7 (TXCT) - D25-6 (AGND) |
Input |
Clock signal |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
- |
| D25-8 (CODE) - D25-6 (AGND) |
Input/output |
Dual directional data communication |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
- |
| D25-10 (VC5) - D25-6 (AGND) |
Input |
Transponder key amplifier power supply |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
- |
*1: With automatic transmission
*2: for manual transmission
*2: for manual transmission
(2) Confirm the pulse based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D25-7 (TXCT) - D25-6 (AGND) |
Input |
Clock signal |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
Pulse generation (Refer to waveform 1) |
·BCC fault
·Abnormal condition ·Different encryption code ·Different serial code NOTE: If the immobilizer key code collation communication is not operated correctly, the fault may be displayed in one or several items listed in the [Current Data Display & Save] described above. |
| D25-8 (CODE) - D25-6 (AGND) |
Output |
Dual directional data communication |
IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*. |
Pulse generation (Refer to waveform 2) |
|
| D25-10 (VC5) - D25-6 (AGND) |
Input |
Transponder key amplifier power supply |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
Pulse generation (Refer to waveform 3) |
NOTE:
*: Before performing this inspection, remove the transmitter battery.
(3) Inspect using an oscilloscope.
CAUTION:
The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
(a) Waveform 1 (reference)
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D25-7 (TXCT) - D25-6 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
(b) Waveform 2 (reference)
Captions in illustration
| *a |
Hold the key above the engine switch. |
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D25-8 (CODE) - D25-6 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*. |
NOTE:
*: Before performing this inspection, remove the transmitter battery.
2. Check the collation ECM (smart key ECM ASSY).
(1) Disconnect the D48 collation ECM (smart key ECM ASSY) connector.
(2) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D48-2 (+B) - D48- 11 (GND) |
Input |
+B power supply |
Always |
11 to 14 V |
- |
| D48-11 (GND) - chassis ground |
- |
Ground |
Always |
1 Ω or less |
- |
(3) Reconnect the D48 connector of the collation ECM (smart key ECM ASSY).
(4) Measure the resistance and voltage based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D41-5 (IG) - D48-11 (GND) |
Input |
Engine switch power supply |
Engine switch OFF → ON (IG) |
1V or less → 11 to 14V |
IG |
| D41-9 (TXCT) - D41-24 (AGND) |
Output |
Clock signal |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
·BCC fault ·Abnormal condition ·Different encryption code ·Different serial code |
| D41-7 (CODE) - D41-24 (AGND) |
Input |
Signal input from transponder key amplifier power |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
|
| D41-1 (VC5) - D41-24 (AGND) |
Output |
Transponder key amplifier power supply |
When IG OFF, and the brake pedal*1 or clutch pedal*2 is depressed, and after 30 seconds or more have passed after the driver opens and closes the door. |
1 V or less |
|
| D41-24 (AGND) - chassis ground |
- |
Transponder key amplifier GND-output short |
Always |
1 Ω or less |
|
| D48-13 (EFIO) -D48-11 (GND)*3 |
Input/output |
EFI communication signal (from collation ECM (smart key ECM ASSY) to ECM) |
IG OFF |
11 to 14 V |
·B1571 ·B1572 ·Engine start request ·EFI code reception |
*1: With automatic transmission
*2: for manual transmission
*3: The ID code box is not included.
*2: for manual transmission
*3: The ID code box is not included.
(5) Confirm the pulse based on the following table.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D41-9 (TXCT) - D41-24 (AGND) |
Output |
Clock signal |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
Pulse generation (Refer to waveform 1) |
·BCC fault ·Abnormal condition ·Different encryption code ·Different serial code |
| D41-7 (CODE) - D41-24 (AGND) |
Input |
Signal input from transponder key amplifier power |
IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*1. |
Pulse generation (Refer to waveform 2) |
|
| D41-1 (VC5) - D41-24 (AGND) |
Output |
Transponder key amplifier power supply |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
Pulse generation (Refer to waveform 3) |
|
| D48-13 (EFIO) -D48-11 (GND)*2 |
Input/output |
EFI communication signal (from collation ECM (smart key ECM ASSY) to ECM) |
Engine switch OFF → ON (IG) |
Pulse generation (Refer to waveform 4) |
·B1571 ·B1572 ·Engine start request ·EFI code reception |
*1: Before performing this inspection, remove the transmitter battery.
*2: The ID code box is not included.
*2: The ID code box is not included.
(6) Inspect using an oscilloscope.
CAUTION:
The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
(a) Waveform 1 (reference)
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D41-9 (TXCT) - D41-24 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
(b) Waveform 2 (reference)
Captions in illustration
| *a |
Hold the key above the engine switch. |
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D41-7 (CODE) - D41-24 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned to OFF, the key is held above the engine switch, and the engine switch is pushed*. |
NOTE:
*: Before performing this inspection, remove the transmitter battery.
(c) Waveform 3 (reference)
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D41-1 (VC5) - D41-24 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
3. Confirm the ID code box (immobilizer code ECM) (with ID code box).
(1) Disconnect the connector A30 of the ID code box (immobilizer code ECM).
(2) Measure the resistance and voltage based on the following table.
If the specified result is not obtained, there may be the defect in the wire harness side.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| A30-1 (+B) - A30- 5 (GND) |
Input |
+B power supply |
Always |
11 to 14 V |
- |
| A30-5 (GND) - Chassis ground |
- |
Ground |
Always |
1 Ω or less |
- |
(3) Reconnect the connector A30 of the ID code box (immobilizer code ECM).
(4) Refer to the table below and measure the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| A30-4 (IMO1) - A30-5 (GND) |
Input/output |
EFI communication signal (from ID code box (immobilizer code ECM) to ECM) |
IG OFF |
11 to 14 V |
·B1571 ·B1572 ·Engine start request ·EFI code reception |
| EFI communication signal (from ID code box (immobilizer code ECM) to ECM) |
IG OFF → IG ON |
Pulse generation (Refer to waveform 1) |
(5) Inspect using an oscilloscope.
CAUTION:
The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
4. Confirm the steering lock actuator ASSY (steering lock ECM).
(1) Refer to the table below and measure the resistance and the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| D59-1 (GND) - Chassis ground |
- |
Ground |
Always |
1 Ω or less |
- |
| D59-3 (SLR+) - Chassis ground |
Input |
Motor drive command signal sent from the steering lock motor drive command signal (collation ECM (smart key ECM ASSY) |
After establishing the necessary conditions, the steering lock motor operates when any one of the doors opens. ·Shift lever positioned in P*1 or N*2 ·The key is held in hand and engine switch is ON (IG), and steering lock is unlocked beforehand. ·If the above conditions are met turn off the engine switch. |
Pulse generation (Refer to waveform 1) |
·Power supply short ·Unlock request reception ·Lock request reception |
| D59-4 (SLR) - Chassis ground |
Output |
Steering lock bar position signal (output signal from steering unlock sensor) |
Steering lock → unlock *3 |
11 to 14 V → 1.2 V or less |
·Push button start error ·Sensor value |
| D59-6 (IGN1) - Chassis ground |
Input |
Power supply mode signal (IG2 power supply input for all steering lock actuator ASSY) |
Engine switch OFF → ON (IG) |
1V or less → 11 to 14V |
·B2788 ·IG |
| D59-7 (B) - Chassis ground |
Input |
Power supply |
Always |
11 to 14 V |
B2788 |
*1: With automatic transmission
*2: for manual transmission
*2: for manual transmission
NOTE:
·*3: With shift lever positioned in P (for automatic transmission), if any one of the doors opens the steering is locked and IG is turned OFF. With ACC ON, the steering is unlocked.
(2) Inspect using an oscilloscope.
CAUTION:
The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
(a) Waveform 1 (reference)
Captions in illustration
| *a |
The steering lock motor does not operate. |
| *b |
The steering lock motor is operating. |
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D59-3 (SLR+) - D59-1 (GND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
If both conditions are met, the steering motor operates and door opens: ·Shift lever positioned in P*1 ·The key is held in hand and engine switch is ON (IG), and steering lock is unlocked beforehand. ·If the above conditions are met turn off the engine switch. |
*1: With automatic transmission
5. CHECK ECM
(1) Refer to the table below and measure the resistance and the voltage and check for a pulse.
| Terminal No. (symbol) |
Input/output |
Terminal description |
Conditions |
Specified condition |
Related [Current Data Display & Save] item / DTC |
|---|---|---|---|---|---|
| A36-4 (GNDEG1) - chassis ground |
- |
Ground |
Always |
1 Ω or less |
- |
| A33-2 (BATT) - A36-4 (GNDEG1) |
Input |
+B power supply |
Always |
11 to 14 V |
- |
| A33-1 (VBEC2) - A36-4 (GNDEG1) |
Input |
+B power supply |
IG ON |
11 to 14 V |
- |
| A34-6 (VBEC1) - A36-4 (GNDEG1) |
Input |
+B power supply |
IG ON |
11 to 14 V |
- |
| A35-25 (IMO1) - A36-4 (GNDEG1) |
Input |
ID code box (immobilizer code ECM) *1 or the collation ECM (smart key ECM ASSY) communication ID code box (immobilizer code ECM) communication input |
IG OFF |
11 to 14 V |
- |
| IG ON |
Pulse generation (Refer to waveform 1) |
- |
*1: The ID code box is included.
*2: The ID code box is not included.
If you cannot get the specified result, there could be a problem in the ECM.*2: The ID code box is not included.
(2) Inspect using an oscilloscope.
CAUTION:
The waveform shown in the figure is an example for reference. The noise and chattering are not shown in the figure.
DIAGNOSIS SYSTEM
1. Description of functions
(1) The collation ECM (smart key ECM ASSY) and ECM controls the vehicle engine immobilizer system function. The engine immobilizer system data and the list of diagnostic codes are read from vehicle data link connector 3 (DLC3).
In some cases, the engine immobilizer system may have defect even though the security indicator light does not illuminate.
If there may be a defect in the system, confirm the defects by using the SSM3 and repair them.
In some cases, the engine immobilizer system may have defect even though the security indicator light does not illuminate.
If there may be a defect in the system, confirm the defects by using the SSM3 and repair them.
2. Check the DLC3.
(1) Check the DLC3.
3. Check the battery voltage.
(1) Measure the battery voltage.
Voltage
: 11 to 14 V
If the voltage is 11 V or less, charge the battery or replace it.4. Symptom that occurred in starting function
| TROUBLE SYMPTOM |
Part name |
Trouble contents of each part |
Expected DTC |
Related [Current Data Display & Save] |
|---|---|---|---|---|
| Engine can not start *1 |
Collation ECM (smart key ECM ASSY) |
Open or short circuit in ECM |
·B278A ·B1571 ·B1572 ·B1577 |
·IG ·#Codes ·Immobilizer when IG=ON ·Immobilizer ·Master key ·Sub key ·BCC fault ·Abnormal condition ·Different encryption code ·Different serial code ·Frame error ·Response ·Wireless starter communication ID ·Wireless C code ·ID box sleep status ·ID box starting status ·Engine start request ·S code check ·L code check ·Unlock request reception ·Lock request reception ·S code check (past) ·L code check (past) ·EFI/EGI code reception ·EFI communication |
| ID code box (immobilizer code ECM)*3 |
Open or short circuit in ECM |
·B1571 ·B1572 ·B1577 |
·Immobilizer when IG=ON ·Immobilizer ·Master key ·Sub key ·BCC fault ·Abnormal condition ·Different encryption code ·Different serial code ·Frame error ·Response ·ID box sleep status ·ID box starting status ·Engine start request ·S code check ·L code check ·S code check (past) ·L code check (past) ·EFI/EGI code reception ·EFI communication |
|
| ECM |
Open or short circuit in ECM |
·B1571 ·B1572 ·B1576 |
EFI/EGI code reception |
|
| EFI system |
ECM is not compatible with the engine immobilizer system that is installed. |
B1576 |
EFI/EGI code reception |
|
| Power supply mode does not change *1 |
Engine switch |
Open or short circuit in switch |
B278A |
·IG ·Unlock request reception ·Lock request reception |
| Collation ECM (smart key ECM ASSY) |
Open or short circuit in ECM |
·B2271 ·B2274 |
·IG ·Immobilizer when IG=ON ·Immobilizer |
|
| The steering lock can not lock/unlock * 2. |
Steering lock ECM (steering lock actuator ASSY) |
·Open or short circuit in ECM ·Actuator stuck |
·B2781 ·B2782 ·B2788 |
·Unlock request reception ·Lock request reception |
*1: Refer to the symptom list of the entry & start system (start function).
*2: Refer to the symptom list of the steering lock system.
*3: The ID code box is included.
*2: Refer to the symptom list of the steering lock system.
*3: The ID code box is included.
DTC CHECK / CLEAR
1. CHECK FOR IMMOBILISER DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the SSM3 on.
(4) Enter the following menus: [Keyless access system]→ [Collation ECM] → [Diagnostic Code(s) Display]
(5) Check for DTCs.
2. CHECK FOR ECM DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the SSM3 on.
(4) Enter the following menus: [Engine Control System] → [Diagnostic Code(s) Display]
(5) Check for DTCs.
3. CLEAR IMMOBILISER DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the SSM3 on.
(4) Enter the following menus: [Keyless access system]→ [Collation ECM] → [Clear Memory]
(5) Clear the DTCs.
4. CLEAR ECM DTC
(1) Connect the SSM3 to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the SSM3 on.
(4) Enter the following menus: [Engine Control System] → [Clear Memory]
(5) Clear the DTCs.
CURRENT DATA DISPLAY & SAVE / SYSTEM OPERATION CHECK MODE
1. Current Data Display & Save
CAUTION:
In the following table, the value listed in the normal condition is a reference value. Do not depend on reference value only when judging if the part is faulty.
NOTE:
By using the SSM3 and viewing [Current Data Display & Save], you can find out about the value and status related to items such as the switch, the sensor, or the actuator without having to remove the relevant parts. Because the non-intrusive inspection allows you to read the intermittent statuses or signals without interfering with parts or lines, it is very convenient. By reading the [Current Data Display & Save] information at the initial stage of troubleshooting, you can save on time for diagnosing trouble.
(1) Connect the SSM3 to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn on the SSM3.
(4) Input the following menus: [Keyless access system] → [Collation ECM] → [Current Data Display & Save]
(5) Based on the contents of the SSM3 display, read the [Current Data Display & Save].
Entry & Start
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Ignition] |
Engine switch condition / OFF or ON |
[OFF]: IG OFF [ON]: Engine switch is ON (IG). |
Using this [Current Data Display & Save] item, identify the cause when all entry & start system/wireless functions do not operate. |
| [IG = ON, immobilizer set condition established] |
Engine immobilizer system condition when the power supply mode is ON (IG) / Unset or Set |
Unset: It is not set when the engine immobilizer system is engine switch ON (IG). Or the engine immobilizer system releases the setting for 40 times after setting. Set: When the engine immobilizer system is set (driver’ door opens/closes with engine switch ON (IG). |
- |
| [Immobilizer] |
The engine immobilizer system condition is judged by the collation ECM (smart key ECM ASSY) / Unset or Set |
Set: Engine immobilizer set (engine start prohibited) (engine switch OFF) Unset: Engine immobilizer unset (engine start permitted) [engine switch ON (ACC) or (IG)] |
When [Set] is displayed, the engine start function is prohibited. |
| [Master] |
Whether the master key ID code matches with the ID code registered in the collation ECM (smart key ECM ASSY) / Does not match, or match |
Does not match: The master key ID code does not match with the ID code registered in the collation ECM (smart key ECM ASSY). Match: The master key ID code matches with the ID code registered in the collation ECM (smart key ECM ASSY). |
·Always [Match] is displayed. ·Without the diagnosis function |
| [Sub] |
Whether the sub key ID code matches with the ID code registered in the collation ECM (smart key ECM ASSY) / Does not match, or match |
Match: The sub key ID code matches with the ID code registered in the collation ECM (smart key ECM ASSY). Does not match: The sub key ID code does not match with the ID code registered in the collation ECM (smart key ECM ASSY). |
·Always [Match] is displayed. ·Without the diagnosis function |
| [BCC failure] |
Transponder chip BCC signal condition * 1 / OK or NG |
OK: BCC signal normal NG: BCC signal fault (fault in the code calculation function for key / collation ECM (smart key ECM ASSY)) |
The following may be the cause: ·Communication error caused by the noise entering from outside (LF). ·Defect in the electrical key transmitter SUB-ASSY or the collation ECM (smart key computer ASSY) |
| [Status Failure] |
Transponder chip condition signal * 1 / OK or NG |
OK: Transponder chip condition signal normal NG: Transponder chip condition signal fault (fault in the code calculation function for key / collation ECM (smart key ECM ASSY) |
The following may be the cause: ·Communication error caused by the noise entering from outside (LF). ·Defect in the electrical key transmitter SUB-ASSY or the collation ECM (smart key computer ASSY) |
| [Incorrect Encryption] |
Code condition between the transponder chip and collation ECM (smart key ECM ASSY) * 1 / OK or NG |
OK: Code of the transponder chip and collation ECM (smart key ECM ASSY) matches. NG: Code of the transponder chip and collation ECM (smart key ECM ASSY) does not match. |
The following may be the cause: ·The electrical key transmitter SUB-ASSY of another vehicle is used. ·Defect in the electrical key transmitter SUB-ASSY or the collation ECM (smart key computer ASSY) |
| [Incorrect Serial No.] |
Vehicle serial No. * 1 / OK or NG |
OK: Signal from the transponder chip and the vehicle serial No. outputs to the collation ECM (smart key ECM ASSY) matches. NG: Signal from the transponder chip and the vehicle serial No. outputs to the collation ECM (smart key ECM ASSY) does not match. |
The following may be the cause: ·The electrical key transmitter SUB-ASSY of another vehicle is used. ·Defect in the electrical key transmitter SUB-ASSY or the collation ECM (smart key computer ASSY) |
| [Frame error] |
The data condition sent from the electrical key transmitter SUB-ASSY / OK or NG |
OK: No problems in the data sent from the electrical key transmitter SUB-ASSY NG: Problems in the data sent from the electrical key transmitter SUB-ASSY |
·[OK] is displayed. ·Without the diagnosis function |
| [Sleep possible status] |
ID code box (immobilizer code ECM) is in sleep mode condition / No or Yes |
No: ID code box (immobilizer code ECM) does not enter to the sleep mode. Yes: ID code box (immobilizer code ECM) enters to the sleep mode. |
- |
| [Wake-up transmission status] |
ID code box (immobilizer code ECM) condition *3 / No or Yes |
No: ID code box (immobilizer code ECM) does not send the wake-up signal. Yes: ID code box (immobilizer code ECM) sends the wake-up signal. |
- |
| [EFI/EGI code reception status] |
The request for engine start permission sent from the collation ECM (smart key ECM ASSY) to the ID code box (immobilizer code ECM)* 3 / OK or NG |
OK: The engine start permission request signal that the ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 receives from the collation ECM (smart key ECM ASSY) NG: The ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 does not receive the engine start permission request signal. |
If [OK] is not displayed, the ECM cannot release the immobilizer setting. |
| [S Code Check] *9 |
S code check result * 4 / OK or NG |
OK: S code check result is normal. NG: S code check result is abnormal. |
The following may be the cause: ·The registration setting is not performed for the collation ECM (smart key ECM ASSY) or ID code box (immobilizer code ECM). ·There are defects in the collation ECM (smart key ECM ASSY) or ID code box (immobilizer code ECM). |
| [L Code Check] |
L code check result * 5 / OK or NG |
OK: L code check result is normal. NG: L code check result is abnormal. |
The following may be the cause: ·The registration setting is not performed for the collation ECM (smart key ECM ASSY) or lock actuator ASSY (steering lock ECM). ·There are defects in the collation ECM (smart key ECM ASSY) or steering lock actuator (steering lock ECM). |
| [Steering lock unlock request reception status] |
Steering unlock command condition from the collation ECM (smart key ECM ASSY) * 6 / OK or NG |
OK: The collation ECM (smart key ECM ASSY) sends the steering unlock command (within 10 seconds after engine switch is ON (ACC) or ON (IG), or within 10 seconds after engine starting operation) NG: The collation ECM (smart key ECM ASSY) does not send the steering unlock command (engine switch does not turn ON (ACC) or ON (IG), or engine starting operation cannot be performed) |
Even when the steering lock is unlocked, if the [OK] is not displayed, the collation ECM (smart key ECM ASSY) may be defective. |
| [Steering lock lock request reception status] |
Steering lock command condition from the collation ECM (smart key ECM ASSY) * 7 / OK or NG |
OK: The collation ECM (smart key ECM ASSY) sends the steering unlock command (within 10 seconds after the door opens/closes when the engine switch is OFF with the shift lever in P* 11) NG: The collation ECM (smart key ECM ASSY) does not send the steering unlock command (the door does not open/close when the engine switch is OFF with the shift lever in P* 11) |
Even when the steering lock condition is met, if the [OK] is not displayed, the collation ECM (smart key ECM ASSY) may be defective. |
| [S Code Check(Past)] |
S code check result (past) / OK or NG (past) |
OK: Confirmation operation finished (past). NG (past): Confirmation operation has not finished (past). |
- |
| [L Code Check(Past)] |
L code check result (past) / OK or NG (past) |
OK: Confirmation operation finished (past). NG (past): Confirmation operation has not finished (past). |
- |
| [Engine start permission request reception status] |
Recognition information that is sent to the ID code box (immobilizer code ECM) from ECM, when the ECM receives the engine start permission signal from the ID code box (immobilizer code ECM)*8. / OK or NG |
OK: The ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 receives the signal sent from ECM in order to release the engine immobilizer setting. NG: The ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 does not receive the signal sent from ECM in order to release the engine immobilizer setting. |
- |
| [EFI/EGI Communication] |
Communication status to release the immobilizer setting between the collation ECM (smart key ECM ASSY) and ECM / NG or OK |
NG: Communication to release the immobilizer setting between the collation ECM (smart key ECM ASSY) and ECM does not start. OK: Communication to release the immobilizer setting between the collation ECM (smart key ECM ASSY) and ECM starts. |
Even when the condition to release the immobilizer setting is met, if the [NG] is displayed in the items and [OK] is displayed in the items in the engine start request, ECM may be defective. If the engine cannot be started, use this [Current Data Display & Save] while the troubleshooting is performed. |
NOTE:
·*1: This indicates that there is a problem in the communication type between the electrical key transmitter SUB-ASSY and the collation ECM (smart key computer ASSY). Possible fault causes include the external radio waves, or the faulty electrical key transmitter SUB-ASSY, or collation ECM (smart key ECM ASSY), use of other vehicle electrical key transmitter SUB-ASSY.
·*2: This indicates that the wake-up signal communication is possible. ([Yes] indicates that the LIN communication signal is sent to start the confirmation operation.) If the steering lock motor operates normally and IGE ON signal is received (steering lock work request), or the communication occurs between the ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 and ECM, the displayed item is changed to [Yes].
·*3: This indicates that the engine start permission request signal (EGST) sent from ECM (smart key ECM ASSY) is received by the ID code box (immobilizer code ECM)*9 or the collation ECM (smart key ECM ASSY)*10.
·*4: This indicates the collation results of the collation code for the collation ECM (smart key ECM ASSY) and ID code box (immobilizer code ECM) collation code.
·*5: This indicates the collation results of the collation code for the steering lock actuator ASSY (steering lock ECM) and the ID code box (immobilizer code ECM) *9 or collation ECM (smart key ECM ASSY)*10.
·*7: The collation ECM (smart key ECM ASSY) outputs the steering lock request for 10 seconds after the engine switch is OFF, or after the door is opened with the shift lever positioned in P.*11.
·*8: This indicates that the ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 receives the confirmation information from the ECM. The display changes to [OK] if the ECM can send the information.
·*2: This indicates that the wake-up signal communication is possible. ([Yes] indicates that the LIN communication signal is sent to start the confirmation operation.) If the steering lock motor operates normally and IGE ON signal is received (steering lock work request), or the communication occurs between the ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 and ECM, the displayed item is changed to [Yes].
·*3: This indicates that the engine start permission request signal (EGST) sent from ECM (smart key ECM ASSY) is received by the ID code box (immobilizer code ECM)*9 or the collation ECM (smart key ECM ASSY)*10.
·*4: This indicates the collation results of the collation code for the collation ECM (smart key ECM ASSY) and ID code box (immobilizer code ECM) collation code.
·*5: This indicates the collation results of the collation code for the steering lock actuator ASSY (steering lock ECM) and the ID code box (immobilizer code ECM) *9 or collation ECM (smart key ECM ASSY)*10.
·When the steering lock actuator ASSY (steering lock ECM) receives the unlock request from the collation ECM (smart key ECM ASSY), the confirmation operation for ID code box (immobilizer code ECM) L code is performed. When the L code is matched, the steering lock actuator ASSY (steering lock ECM) unlocks the steering. But when the S code check result is not matched, the steering lock does not unlock.
·*6: The collation ECM (smart key ECM ASSY) outputs the steering lock/unlock request for 10 seconds after the engine switch is ON (ACC) or ON (IG) or the engine start operation has been performed.·*7: The collation ECM (smart key ECM ASSY) outputs the steering lock request for 10 seconds after the engine switch is OFF, or after the door is opened with the shift lever positioned in P.*11.
·*8: This indicates that the ID code box (immobilizer code ECM)*9, or collation ECM (smart key ECM ASSY)*10 receives the confirmation information from the ECM. The display changes to [OK] if the ECM can send the information.
·*9: The ID code box is included.
·*10: The ID code box is not included.
·*11: With automatic transmission
·*10: The ID code box is not included.
·*11: With automatic transmission
(a) Refer to the items in following [Current Data Display & Save] for the actual vehicle data.
NOTE:
With the IG OFF and the shift lever in P*6, perform the following operation to confirm the power supply mode.
*1: Without depressing the brake pedal*6 or clutch pedal*7, push the engine switch to confirm the power supply mode is turned ON (ACC).
*2: Without depressing the brake pedal*6 or clutch pedal*7, push the engine switch to confirm the power supply mode turns to ON (IG).
*3: Depress the brake pedal*6 or clutch pedal*7 (stop light switch*6 or clutch start switch*7 turns to ON).
*4: Push the engine switch to confirm the power supply mode turns to ON.
*5: Open the door (the steering lock operation starts when the door opens).
*6: With automatic transmission
*7: for manual transmission
*2: Without depressing the brake pedal*6 or clutch pedal*7, push the engine switch to confirm the power supply mode turns to ON (IG).
*3: Depress the brake pedal*6 or clutch pedal*7 (stop light switch*6 or clutch start switch*7 turns to ON).
*4: Push the engine switch to confirm the power supply mode turns to ON.
*5: Open the door (the steering lock operation starts when the door opens).
*6: With automatic transmission
*7: for manual transmission
2. System Operation Check Mode
NOTE:
By performing the [System Operation Check Mode] using the SSM3, relay, VSV, actuator and other devices can be operated without removing parts. This type of non-intrusive function inspection is very useful because the intermittent operation is possible without interference with parts or wiring. Diagnostic time can be reduced by performing the [System Operation Check Mode] at an early stage of troubleshooting. The information of [Current Data Display & Save] can be displayed while performing the [System Operation Check Mode].
(1) Connect the SSM3 to the DLC3.
(2) Turn IG SW to ON.
(3) Turn on the SSM3.
(4) Enter the following menu items: [Integ. unit mode] → [Work Support] → [System Operation Check Mode].
DIAGNOSTIC TROUBLE CODE CHART
ECM
| Diagnostic codes |
Diagnostic items |
Diagnostic code output check operation |
Reference pages |
|---|---|---|---|
| B1571 |
Identification code mismatch (immobilizer collation mismatch) |
Engine switch on (IG) |
|
| B1572 |
IMM Circuit Failure (Except Antenna Circuit) |
Engine switch on (IG) |
|
| B1576 |
EGI unit EEPROM |
·Engine switch on (IG) ·Register the ECU communication ID |
|
| B1577 |
Immobilizer unit EEPROM |
Engine switch on (IG) |
|
Certification ECU
| Diagnostic codes |
Diagnostic items |
Diagnostic code output check operation |
Reference pages |
|---|---|---|---|
| B2784 |
Faulty antenna coil |
With the shift lever in P* the electrical key transmitter sub-assembly is held against the engine switch and an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted. |
|
| B278A |
Faulty immobilizer power |
With the shift lever in P* the electrical key transmitter is held against the engine switch and an engine start operation is performed by pressing and holding the engine switch when the transmitter battery is depleted. |
|
| B278D |
ID code box recognition evaluation abnormal |
Always |
|
| DTC | B1571 | Mismatching identification code (immobilizer collation mismatched) |
|---|
Circuit description
The ECM outputs this code if the reference code between the collation ECM (smart key ECM ASSY)*2 or the ID code box (immobilizer code ECM)*1 and the ECM does not match.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B1571 |
The ECM reference code and the reference code sent from the collation ECM (smart key ECM ASSY)*2 or the ID code box (immobilizer code ECM)*1 do not match (1-trip detection logic*). |
·ECM ·Collation ECM (smart key ECM ASSY)*2 ·ID code box (immobilizer code ECM) *1 |
IG ON |
*: Output only when a failure is noted.
*1: The ID code box is included.
*2: The ID code box is not included.
*1: The ID code box is included.
*2: The ID code box is not included.
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| The engine does not start. |
- |
[Current Data Display & Save]/[System Operation Check Mode]
| Diagnostic codes |
[Current Data Display & Save] and [System Operation Check Mode] |
|---|---|
| B1571 |
- |
Inspection steps
CAUTION:
·Refer to the entry & start system (entry function) before replacing the collation ECM (smart key ECM ASSY)*2 or ID code box (immobilizer code ECM)*1. (Refer to )
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
)·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
1.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
> Go to Step 2.
OK▼
Complete
2.
Replacement of the ECM
(1) Replace the ECM with a new one temporarily.
Next▼
3.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
>Replacement of the collation ECM (smart key computer ASSY)*2 or ID code box (immobilizer code ECM)*1
OK▼
END (faulty ECM)
| DTC | B1572 | [IMM Circuit Failure (Except Antenna Circuit)] |
|---|
Circuit description
The ECM records this code when a communication failure is detected between the ID code box (immobilizer code ECM)*1, or collation ECM (smart key ECM ASSY)*2, and ECM.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B1572 |
When the communication failure is detected between the ID code box (immobilizer code ECM)*1, or collation ECM (smart key ECM ASSY)*2 and ECM (1 trip detection logic*3): |
·ID code box (immobilizer code ECM)*1 ·Collation ECM (smart key ECM ASSY)*2 ·ECM ·Harness or connector |
IG ON |
*1: The ID code box is included.
*2: The ID code box is not included.
*3: Output only when a failure is noted.
*2: The ID code box is not included.
*3: Output only when a failure is noted.
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| The engine does not start. |
- |
Related [Current Data Display & Save] and [System Operation Check Mode] items
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B1572 |
Collation
·[Immobilizer] |
Circuit figure
Inspection steps
CAUTION:
·Refer to the entry & start system (entry function) before replacing the collation ECM or ID code box (immobilizer code ECM)*. (Refer to )
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
)·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
*: The ID code box is included.
1.
SSM3 data reading
(1) Use the SSM3 to perform the data monitor for the collation ECM (smart key ECM ASSY). (Refer to )
)(2) Turn to IG ON, and without opening or closing a door, check the following data.
SSM3 screen: [Each System Check] → [Keyless access system check] → [Collation ECM] → [Current Data Display & Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Immobilizer] |
This item indicates the engine immobilizer system status, as determined by the collation ECM (smart key ECM ASSY). Display range: [Unset] / [Set] |
[Unset]: The engine immobilizer is unset (engine start permitted) (ACC ON or further) [Set]: The engine immobilizer is set (engine start prohibited) (IG OFF) |
When [Set] is displayed for this item, you cannot start the engine. ·The security indicator light blinks when [Set] is displayed for this item. ·The security indicator light is interlocked with the [Set]/[Unset] status of the immobilizer, but not with the [Lock]/[Unlock] status of the steering wheel. |
| [Engine start] |
This item indicates the engine start permission of the collation ECM (smart key ECM ASSY). Display range: [OK] / [NG] |
[OK]: The collation ECM (smart key ECM ASSY) allows the engine to start. [NG]: The collation ECM (smart key ECM ASSY) prohibits the engine from starting. |
- |
| [Unlock confirmation] |
This item indicates the unlock confirmation status of the steering lock actuator ASSY (steering lock ECM). Display range: [Set] / [UnSet] |
[Set]: The unlock is set. [UnSet]: The unlock is not set. |
When “[Unset]“ is displayed, the steering cannot be unlocked and the engine cannot start. |
Criteria
: [Immobilizer] displays [Unset], [Engine start] displays [OK], and [Unlock confirmation] displays [Set].
NG
>To Smart Entry & Start System (Start system) (engine will not start) (Refer to )
)OK▼
2.
SSM3 data reading
(1) Use the SSM3 to perform the data monitor for the collation ECM (smart key ECM ASSY). (Refer to )
)(2) While depressing the brake pedal for AT vehicles or the clutch pedal for MT vehicles, press and hold the push engine switch, then check the following data.
SSM3 screen: [Each System Check] → [Keyless access system check] → [Collation ECM] → [Current Data Display & Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| EFI/EGI code reception status |
The engine control computer receives engine start permission from the ID code box (immobilizer code ECM)*1 or the collation ECM (smart key ECM ASSY)*2, and returns collation information to the ID code box (immobilizer code ECM)*1 or the collation ECM (smart key ECM ASSY)*2. This item indicates that the ID code box (immobilizer code ECM)*1 or the collation ECM (smart key ECM ASSY)*2 cannot receive that information. Display range: [NG] / [OK] |
[NG]: The ID code box (immobilizer code ECM)*1 or collation ECM (smart key ECM ASSY)*2 does not receive the signal for releasing the immobilizer from the engine control computer. [OK]: The ID code box (immobilizer code ECM)*1 or collation ECM (smart key ECM ASSY)*2 receives the signal for releasing the immobilizer from the engine control computer. |
- |
*1: The ID code box is included.
*2: The ID code box is not included.
*2: The ID code box is not included.
Criteria
: [OK] Is displayed if the EGI code is received.*
NOTE:
Even when [OK] is displayed, it changes to [NG] after about 10 seconds. When rechecking it, turn the ignition OFF before rechecking it.
NG
>Repair or replacement of the harnesses between the ID code box (immobilizer ECM)*1 or the collation ECM (smart key ECM ASSY)*2 and the ECU
OK▼
3.
Check the vehicle condition.
B
> Go to Step 6.
A▼
4.
Checking the harnesses and connectors
(1) Disconnect the connector A30 of the ID code box (immobilizer code ECM).
(2) Disconnect the A35 ECM connector.
(3) Measure the resistance according to the following table.
NG
>Repair or replace the harnesses or connectors.
OK▼
5.
Replacement of the ECM
(1) Replace the ECM with a new one temporarily.
Next▼
6.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
>Replace the ID code box (immobilizer code ECM).
OK▼
END (faulty ECM)
7.
Checking the harnesses and connectors
(1) Disconnect the D48 collation ECM (smart key ECM ASSY) connector.
(2) Disconnect the A35 ECM connector.
(3) Measure the resistance according to the following table.
NG
>Repair or replace the harnesses or connectors.
OK▼
8.
Replacement of the ECM
(1) Replace the ECM with new one temporarily.
Next▼
9.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the “immobilizer registration manual”)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
>Replacement of the collation ECM (smart key computer ASSY)
OK▼
END (faulty ECM)
| DTC | B1576 | EGI unit EEPROM |
|---|
Circuit description
The ECM outputs this code if the internal error is detected in the ECM or it can not access ROM inside the ECM during ECM communication ID registration.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B1576 |
·Fault inside ECM (1 trip detection logic) ·When it can not access ROM inside the ECM during ECM communication ID registration. (1 trip detection logic*). |
ECM |
·Engine switch is ON (IG) ·Register the ECM communication ID. |
*: Output only when a failure is noted.
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
·The engine does not start. ·The ECM communication ID is not registered. |
- |
[Current Data Display & Save]/[System Operation Check Mode]
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B1576 |
- |
Inspection steps
CAUTION:
After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
1.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the REGISTRATION MANUAL FOR IMMOBILIZER)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
> Go to Step 2.
OK▼
Complete
2.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the REGISTRATION MANUAL FOR IMMOBILIZER)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
> Go to Step 3.
OK▼
Complete
3.
ECU communication ID registration
(1) Register the ECM communication ID. (Refer to the REGISTRATION MANUAL FOR IMMOBILIZER)
(2) Check if the engine can be started.
Criteria
: The engine can start.
NG
>Replacement of the ECM
OK▼
Complete
| DTC | B1577 | Immobilizer unit EEPROM |
|---|
Circuit description
The ECM outputs this code if the internal error is detected in the ECM or it can not access ROM inside the ECM during ECM communication ID registration.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B1577 |
·Fault inside the collation ECM (smart key ECM ASSY)*2 or the ID code box*1 (1 trip detection logic) ·Cannot access the ROM inside the collation ECM (smart key ECM ASSY*2 or ID code box*1) (1 trip detection logic) |
Collation ECM (smart key ECM ASSY)*2 or ID code box*1 |
Engine start operation. |
*1: The ID code box is included.
*2: The ID code box is not included.
*: Output only when a failure is noted.
*2: The ID code box is not included.
*: Output only when a failure is noted.
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| The engine does not start. |
Engine switch is ON (IG) |
[Current Data Display & Save]/[System Operation Check Mode]
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B1577 |
- |
Inspection steps
CAUTION:
·Refer to the entry & start system (entry function) before replacing the collation ECM (smart key ECM ASSY)*2 or ID code box*1. (Refer to )
·After the repair work is complete, perform the “DTC output check operationn” to confirm that the diagnostic code is not output again.
)·After the repair work is complete, perform the “DTC output check operationn” to confirm that the diagnostic code is not output again.
1.
Clear the DTC.
(1) Clear the DTC. (Refer to )
)Next▼
2.
DTC check
(1) Turn to IG OFF, and disconnect the battery ground terminal
(2) Connect the battery ground terminal.
(3) If there is an ID code box, register the ID code box. If there is no ID code box, turn the ignition switch ON and wait 5 seconds or more.
(4) Check the DTC. (Refer to )
)Criteria
: DTC B1577 is not output.
NG
>Replacement of the collation ECM (smart key computer ASSY)*2 or ID code box*1
OK▼
Complete
| DTC | B2784 | Faulty antenna coil |
|---|
Circuit description
When the open or short circuit is detected in the transponder key amplifier coil built in the engine switch, the collation ECM (smart key ECM ASSY) outputs this DTC. This DTC is also output as the past DTC.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B2784 |
Open or short circuit in the transponder key amplifier coil built in the engine switch (judged by communication to the collation ECM (smart key ECM ASSY)) (1 trip detection logic*1) ·Open circuit in AGND, VC5, TXCT, or CODE (including disconnected engine switch) ·Open circuit in the transponder key amplifier coil built in the engine switch. |
·Engine switch ·Harness or connector ·Collation ECM (smart key ECM ASSY) |
When the transmitter battery is run-out, with the shift lever in P* 2 and hold the electrical key transmitter SUB-ASSY above the engine switch, and push the engine switch to perform the engine start operation. |
*1: Output only when a failure is noted.
*2: With automatic transmission
*2: With automatic transmission
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| When the transmitter battery is run-out, with the shift lever in P* and the electrical key transmitter SUB-ASSY is held above the engine switch, the engine can not start even though the engine switch is pushed. |
- |
*: for automatic transmission
[Current Data Display & Save]/[System Operation Check Mode]
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B2784 |
- |
Circuit figure
Inspection steps
CAUTION:
·Before replacing the collation ECM (smart key ECM ASSY), refer to “entry & start system (entry function)”. (Refer to )
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
)·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
1.
Checking the harnesses and connectors (collation ECM (smart key ECM ASSY) - engine switch)
(1) Disconnect the connector D41 of the collation ECM (smart key ECM ASSY).
(2) Disconnect the D25 engine switch connector.
(3) Measure the resistance according to the following table.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| D41-1 (VC5) - D25-10 (VC5) |
Always |
1 Ω or less |
| D41-7 (CODE) - D25-8 (CODE) |
Always |
1 Ω or less |
| D41-9 (TXCT) - D25-7 (TXCT) |
Always |
1 Ω or less |
| D41-24 (AGND) - D25-6 (AGND) |
Always |
1 Ω or less |
| D41-1 (VC5) - Chassis ground |
Always |
10 kΩ or more |
| D41-7 (CODE) - Chassis ground |
Always |
10 kΩ or more |
| D41-9 (TXCT) - Chassis ground |
Always |
10 kΩ or more |
| D41-24 (AGND) - chassis ground |
Always |
10 kΩ or more |
NG
>Repair or replace the harnesses or connectors.
OK▼
2.
Replace engine switch.
(1) Temporarily replace the engine switch with new one or one that is functioning properly. (Refer to )
)Next▼
3.
Clear the DTC.
(1) Clear the DTC. (Refer to )
)Next▼
4.
DTC check
(1) Check for DTC. (Refer to )
)
Criteria
: DTC B2784 is not output.
NG
>Replacement of the collation ECM (smart key computer ASSY)
OK▼
END (faulty engine switch)
| DTC | B278A | Faulty immobilizer power |
|---|
Circuit description
When the short circuit is detected in the GND of the transponder key amplifier power supply in the engine switch, the collation ECM (smart key ECM ASSY) outputs this DTC.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B278A |
The short circuit in the GND of the transponder key amplifier power supply in the engine switch (VC5-VC5) (1 trip detection logic*1). |
·Harness or connector ·Engine switch ·Collation ECM (smart key ECM ASSY) |
When the transmitter battery is run-out, with the shift lever in P* 2 and hold the electrical key transmitter SUB-ASSY above the engine switch, and push the engine switch to perform the engine start operation. |
*1: Output only when a failure is noted.
*2: With automatic transmission
*2: With automatic transmission
Vehicle status and failsafe upon detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| When the transmitter battery is run-out, with the shift lever in P* and the electrical key transmitter SUB-ASSY is held above the engine switch, the engine can not start even though the engine switch is pushed. |
- |
*: for automatic transmission
Related [Current Data Display & Save] and [System Operation Check Mode] items
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B278A |
- |
Circuit figure
Inspection steps
CAUTION:
·Before replacing the collation ECM (smart key ECM ASSY), refer to “entry & start system (entry function)”. (Refer to )
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
)·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
1.
Checking the harnesses and connectors (collation ECM (smart key ECM ASSY) - engine switch)
(1) Disconnect the D41 collation ECM (smart key ECM ASSY) connector.
(2) Disconnect the D25 engine switch connector.
(3) Measure the resistance according to the following table.
NG
>Repair or replace the harnesses or connectors.
OK▼
2.
Check the collation ECM (smart key ECM ASSY).
(1) Reconnect the D41 connector of the collation ECM (smart key ECM ASSY).
(2) Reconnect the D25 engine switch connector.
(3) Using an oscilloscope, check the waveform.
NOTE:
Perform this check on the engine switch side.
Measuring conditions
| Item |
Contents |
|---|---|
| Tester connection |
D25-10 (VC5) - D25-6 (AGND) |
| Tool setting |
2V/DIV., 200ms./DIV. |
| Conditions |
IG is turned OFF, the key is brought outside the vehicle, and within 30 seconds after the engine switch is pushed. |
Criteria
: The waveform is output normally (Refer to the figure).
Captions in illustration
| *a |
Connector connected (Engine switch) |
NG
>Replacement of the collation ECM (smart key computer ASSY)
OK▼
Replace engine switch.
| DTC | B278D | ID code box recognition error |
|---|
Circuit description
When the collation ECM (smart key ECM ASSY) detects the input signal that indicates that the ID code box is installed on the vehicle even when ID code box is not registered, the collation ECM (smart key ECM ASSY) outputs this DTC.
| Diagnostic codes |
Detecting conditions |
Faulty part |
Diagnostic code output check operation |
|---|---|---|---|
| B278D |
Even without installation of the wire harness that judges whether the ID code box is installed on the vehicle or not, the collation ECM (smart key ECM ASSY) receives the LIN signal from the ID code box. |
There are not the communication failure without ID code box. |
Always |
*: Output only when a failure is noted.
Vehicle status and failsafe upon failure detection
| Vehicle status when a problem is detected |
Failsafe function when a problem is detected |
|---|---|
| Key registration is prohibited. |
- |
[Current Data Display & Save]/[System Operation Check Mode]
| Diagnostic codes |
[Current Data Display & Save]/[System Operation Check Mode] |
|---|---|
| B278D |
- |
Inspection steps
CAUTION:
·Before performing the following check procedures, check that the ID code box (immobilizer code ECM) is not installed on the vehicle.
·Refer to the REGISTRATION MANUAL FOR IMMOBILIZER before replacing the collation ECM (smart key ECM ASSY).
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
·Refer to the REGISTRATION MANUAL FOR IMMOBILIZER before replacing the collation ECM (smart key ECM ASSY).
·After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
1.
Clear the DTC.
(1) Clear the DTC. (Refer to )
)Next▼
2.
DTC check
(1) Check the DTC. (Refer to )
)
NOTE:
Before checking DTC, perform [Diagnostic code output check operation].
Criteria
: B278D is not output
NG
> Replacement of the collation ECM (smart key ECM ASSY)
OK▼
Complete
| Security indicator does not blink |
|---|
Circuit description
When the immobilizer function is set (power OFF), the smart key ECM ASSY (collation ECM) sends the security indicator light drive signal to the main body ECM (network gateway computer) via CAN communication, and the main body ECM (network gateway computer) makes the security indicator light in the combination meter ASSY blink.
Circuit figure
Inspection steps
CAUTION:
·When replacing the smart key ECM ASSY (collation ECM), check the precautions (refer to ), and refer to the “Immobilizer Registration Manual”.
·Check the fuses before performing the diagnosis.
), and refer to the “Immobilizer Registration Manual”.·Check the fuses before performing the diagnosis.
1.
DTC check
(1) Check DTC using SSM3. (Refer to )
)
Criteria
: Diagnostic code is not output.
NG
>To the list of diagnostic codes (Refer to )
)OK▼
2.
Implementation of the SSM3 active test (security indicator)
(1) Use the SSM3 to perform the active test, and check that the security indicator light lights up. (Refer to )
)
SSM3 screen: [Each System Check]→ [Integ. unit mode]→ [Work Support]→ [System Operation Check Mode]
| Item |
Drive |
Remarks |
|---|---|---|
| [Security Indicator] |
Output/stop |
When carrying the electrical key transmitter SUB-ASSY and in IG ON |
Criteria
: The security indicator light lights up / turns off.
NG
> Go to Step 4.
OK▼
Replacement of the main body ECM (Network gateway computer)
3.
Reading the SSM3 data (Immobilizer evaluation)
(1) Turn the ignition switch to OFF.
(2) Using the SSM3, follow the screen display and read the data monitor. (Refer to )
)
SSM3 screen: [Each System Check] → [Keyless access system check] → [Collation ECM] → [Current Data Display & Save]
| Item Name |
Description/display range |
Normal value |
Remarks |
|---|---|---|---|
| [Immobilizer] |
This item indicates the engine immobilizer system status, as determined by the collation ECM (smart key ECM ASSY). Display range: [Unset] / [Set] |
[Unset]: The engine immobilizer is unset (engine start permitted) (ACC ON or further) [Set]: The engine immobilizer is set (engine start prohibited) (IG OFF) |
When [Set] is displayed for this item, you cannot start the engine. ·The security indicator light blinks when [Set] is displayed for this item. ·The security indicator light is interlocked with the [Set]/[Unset] status of the immobilizer, but not with the [Lock]/[Unlock] status of the steering wheel. |
Criteria
: [Set] is displayed.
NG
>Replacement of the smart key ECM ASSY (collation ECM)
OK▼
4.
Inspection of the wiring harnesses and the connectors (instrument panel junction block ASSY - combination meter ASSY)
(1) Disconnect the connector 3B of the instrument panel junction block ASSY.
(2) Disconnect connector D7 of the combination meter ASSY.
NG
>Repair or replacement of wiring harness or connector
OK▼
5.
Unit inspection of the instrument panel junction block ASSY.
(1) Remove the instrument panel junction block ASSY.
(2) Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
(3) Measure the resistance between the terminals.
Resistance
| Inspection terminals |
Inspection conditions |
Standard value |
|---|---|---|
| MB-27 (ILL) - 3B-22 |
Always |
Less than 1 Ω |
| MB-11 (GND) - 3B-18 |
Always |
Less than 1 Ω |
Captions in illustration
| *a |
Connector not connected (Instrument panel junction block ASSY) |
- |
- |
NG
>Replacement of the instrument panel junction block ASSY
OK▼
6.
Replacement of combination meter ASSY
(1) Replace with a new or normal combination meter ASSY.
(2) When the immobilizer is set, check that the security indicator light flashes.
Criteria
: The security indicator light flashes
NG
>Replacement of the main body ECM (network gateway computer) (Refer to )
)OK▼
Complete (Faulty combination meter ASSY)