Diagnosis System

ENGINE IMMOBILIZER: ENGINE IMMOBILIZER SYSTEM: DIAGNOSIS SYSTEM

1. DESCRIPTION

(a) Engine immobilizer system data and Diagnostic Trouble Codes (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 is not illuminated. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.

2. CHECK DLC3





The vehicle's ECU uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.





NOTICE:
*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

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 Techstream to the DLC3, turn the ignition switch ON and attempt to use the Techstream. If the screen displays a communication error message, a problem exists in the vehicle side or the tester side.

* If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.
* If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.