DIAGNOSIS SYSTEM
Troubleshooting
| 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 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 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.Symbol (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