DIAGNOSIS SYSTEM
Troubleshooting
| DESCRIPTION |
The ECU stores trouble codes when trouble occurs on the vehicle. The diagnostic system allows for reading of the trouble codes from the DLC3. Use the intelligent tester to check and solve the problem.
| CHECK DLC3 |
The vehicle's ECU uses ISO 9141-2 (Euro-OBD)/ISO 14230 (M-OBD) for communication. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 9141-2/ISO 14230 format.
Symbols (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
Ignition switch OFF
54 to 67 Ω
CANH (6) - Battery positive
HIGH-level CAN bus line
Ignition switch OFF
1 MΩ or higher
CANH (6) - CG (4)
HIGH-level CAN bus line
Ignition switch OFF
3 kΩ or higher
CANL (14) - Battery positive
LOW-level CAN bus line
Ignition switch OFF
1 MΩ or higher
CANL (14) - CG (4)
LOW-level CAN bus line
Ignition switch OFF
3 kΩ or higher
- HINT:
- If the display shows a communication error message after connecting the intelligent tester to the DLC3 and turning the ignition switch to the ON position, there is a problem with either the vehicle or the tester.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on 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.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle.