Diagnosis System
- DESCRIPTION
Key reminder warning system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.
- 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.
CONNECTOR TERMINAL REFERENCE CHARTSymbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7) - SG (5) Bus "+" line During transmission Pulse generation CG (4) - Body ground Chassis ground Always Below 1 Ω SG (5) - Body ground Signal ground Always Below 1 Ω BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Ignition switch OFF* 54 to 69 Ω CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF* 200 Ω or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF* 200 Ω or higher CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch OFF* 6 kΩ or higher CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch OFF* 6 kΩ or higher *: 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.
Connect the cable of the intelligent tester (With CAN VIM) To the DLC3, turn the power switch to the ON position and attempt to use the Techstream. If the screen displays a communication error message, a problem exists in the vehicle side or tester side.
HINT:
- If communication is normal when the intelligent 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.