Diagnosis System
- DESCRIPTION
- The ECM controls the vehicle's immobilizer system functions. immobilizer system data and Diagnostic Trouble Code (DTC) 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 intelligent tester to check for malfunctions and perform repairs.
- CHECK DLC3
- 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.DLC3
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 intelligent tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the intelligent tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem may be in the vehicle or tester.
- 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.
- 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.
- CHECK BATTERY VOLTAGE
- Measure the battery voltage.
Standard voltage: 11 to 14 V
If the voltage is below 11 V, replace the battery before proceeding to the next step.
- Measure the battery voltage.