Diagnosis System
- CHECK DLC3
- The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 1576-4 format.
HINT:
Connect the cable of the Techstream to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
If communication is still not possible 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.
TERMINAL DESCRIPTION AND SPECIFIED CONDITIONSymbol (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 11 to 14 V CANH (6) - CANL (14) HIGH-level CAN bus line Engine switch off 54 to 69 Ω CANH (6) - Battery positive HIGH-level CAN bus line Engine switch off 1 MΩ or higher CANH (6) - CG (4) HIGH-level CAN bus line Engine switch off 3 MΩ or higher CANL (14) - Battery positive LOW-level CAN bus line Engine switch off 1 MΩ or higher CANL (14) - CG (4) LOW-level CAN bus line Engine switch off 3 MΩ or higher
- The vehicle's ECM uses the ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 1576-4 format.