Diagnosis System
- DESCRIPTION
- When the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and perform repairs.
- CHECK DLC3
- The vehicle 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 ON (IG) and attempt to use the tester. If the display informs that a communication error has occurred, there is a problem either with the vehicle or with the tester.
HINT:
- 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 is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.