Diagnosis System
- Description of functions
- 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 SSM4 and repair them.
- 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).
- Check the DLC3.
- Check the DLC3.
- Check the battery voltage.
- Measure the battery voltage. Voltage: 11 to 14 V
If the voltage is 11 V or less, charge the battery or replace it.
- Measure the battery voltage. Voltage: 11 to 14 V
- Symptom that occurred in starting function
TROUBLE SYMPTOM Part name Trouble contents of each part Expected DTC Related [Data monitor] 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. - B1571
- B1572
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) With ID code box