10C
On-Board Diagnostic System (Self-Diagnosis Function) Description
Immobilizer Control Module and ECM diagnose troubles which may occur in the area including the following parts when the ignition switch is ON.
Immobilizer Control Module:
• Transponder code
• Coil antenna
• ECM/Immobilizer Control Module code
• Serial data link circuit
• Immobilizer Control Module
• Ignition signal
ECM:
• ECM/Immobilizer Control Module code
• Serial data link circuit
• ECM
Vehicle not equipped with immobilizer indicator lamp
With the diagnosis switch terminal of monitor coupler for ECM not grounded, the ignition switch turned ON (but the engine at stop) and regardless of the condition of the electronic fuel injection system, ECM indicates whether a trouble has occurred in the immobilizer control system or not by causing the malfunction indicator lamp to flash or turn ON.
Malfunction indicator lamp is ON:
No trouble exists in the immobilizer control system.
Malfunction indicator lamp is flashing:
ECM or Immobilizer Control Module has detected some trouble in the immobilizer control system.
NOTE:
As soon as the ignition switch is turned ON, ECM and Immobilizer Control Module diagnose if a trouble has occurred in the immobilizer control system. While the diagnosis is being made, the MIL (malfunction indicator lamp) stays ON. If the diagnosis result is “abnormal” (2), it immediately changes to flashing but if the result is “normal” (1), it remains ON. Diagnosis takes about 3 seconds at maximum.
Vehicle equipped with immobilizer indicator lamp
With the ignition switch turned ON (but the engine at stop) regardless of the condition of the engine and emission control system, ECM indicates whether a trouble has occurred in the immobilizer control system or not by causing the immobilizer indicator lamp to flash or turn ON.
Immobilizer indicator lamp is ON:
No trouble exists in the immobilizer control system.
Immobilizer indicator lamp is flashing:
ECM or Immobilizer Control Module has detected some trouble in the immobilizer control system.
NOTE:
As soon as the ignition switch is turned ON, ECM and Immobilizer Control Module diagnose if a trouble has occurred in the immobilizer control system. While the diagnosis is being made, the immobilizer indicator lamp stays ON and if the diagnosis result is “abnormal” (2), it immediately changes to flashing but if the result if “normal” (1), it remains ON. Diagnosis takes about 3 seconds at maximum.
When ECM and Immobilizer Control Module detects a trouble which has occurred in the above areas, it stores DTC corresponding to the exact trouble area in ECM and Immobilizer Control Module memory.
DTCs stored in memory of each controller (Immobilizer Control Module and ECM) can be read by using the procedure described in DTC Check:M13A Model .