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 15765 - 4 format.
HINT:
Connect the cable of the intelligent tester 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 REFERENCE CHARTSymbol 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 Always SG 5 Signal ground Body ground Below 1 Ω Always BAT 16 Battery positive Body ground 11 to 14 V Always CANH 6 CAN "High" line CANL 54 to 69 Ω Engine switch off CANH 6 CAN "High" line Battery positive 1MΩ or higher Engine switch off CANH 6 CAN "High" line CG 3MΩ or higher Engine switch off CANL 14 CAN "Low" line Battery positive 1MΩ or higher Engine switch off CANL 14 CAN "Low" line CG 3MΩ or higher Engine switch off