Diagnosis System
- DESCRIPTION
- The ECM controls the vehicle's immobilizer system functions. Immobilizer system data and Diagnostic Trouble Code (DTCs) can be read through the vehicle's Data Link Connector 3 (DLC3). In some cases, a malfunction may be occurring in the immobilizer system even though the security indicator light is not illuminated. When the system seems to be malfunctioning, use the hand-held tester to check for malfunctions and perform repairs.
- CHECK DLC3
HINT:
The vehicle uses ISO 15765-4 for its communication protocol.
The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
TERMINAL AND CONDITION SPECIFICATION (DLC3 CONNECTOR)Symbol Terminal No. Name Reference terminal Result Condition SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission CG 4 Chassis ground Body ground Below 1 Ω Constant SG 5 Signal ground Body ground Below 1 Ω Constant BAT 16 Battery positive Body ground 11 to 14 V Constant If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:
Connect the cable of the hand-held tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem may be on the vehicle side or tester side.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.
- CHECK BATTERY VOLTAGE
Standard: 11 to 14 V
If the voltage is below 11 V, replace the battery before proceeding.