CAN

CAN COMMUNICATION CIRCUIT 2

Diagnosis Procedure


1. CHECK CAN DIAGNOSIS

Check the CAN diagnosis results from CONSULT to see that the CAN communication circuit 1 has no malfunction.
NOTE:
For identification of CAN communication circuit 1, CAN communication circuit 2, ITS communication circuit, and HEV system CAN circuit, System Diagram.
Is the CAN communication circuit 1 normal?
YES- GO TO 2.
NO- Check and repair CAN communication circuit 1.

2. CONNECTOR INSPECTION

1.Turn the ignition switch OFF.
2.Disconnect the 12V battery cable from the negative terminal.
3.Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
-CAN gateway
-Harness connector M23 and PCB harness side connector
Is the inspection result normal?
YES- GO TO 3.
NO- Repair the terminal and connector.

3. CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1.Disconnect the connector of CAN gateway.
2.Check the continuity between the CAN gateway harness connector terminals.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 4.

4. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

1.Disconnect the harness connector M23.
2.Check the continuity between the CAN gateway harness connector and the harness connector.





Is the inspection result normal?
YES- Replace the PCB harness.
NO- Repair the harness between the CAN gateway harness connector M125 and the harness connector M23.

5. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

1.Disconnect all the unit connectors on CAN communication circuit 2.
2.Check the continuity between the CAN gateway harness connector terminals.





Is the measurement value within the specification?
YES- GO TO 6.
NO- Check the harness and repair or replace the root cause.

6. CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the CAN gateway harness connector and the ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Check the harness and repair or replace the root cause.

7. CHECK CAN GATEWAY TERMINATION CIRCUIT

1.Remove the CAN gateway.
2.Check the resistance between the CAN gateway terminals.





Is the measurement value within the specification?
YES- GO TO 8.
NO- Replace the CAN gateway.

8. CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced.
Inspection result
Reproduced-GO TO 9.
Non-reproduced-Start the diagnosis again. Follow the trouble diagnosis procedure when past error is detected.

9. CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.
1.Turn the ignition switch OFF.
2.Disconnect the 12V battery cable from the negative terminal.
3.Disconnect one of the unit connectors of CAN communication circuit 2.
NOTE:
CAN gateway has two termination circuits. Check other units first.
4.Connect the 12V battery cable to the negative terminal. Check if the symptoms described in the "Symptom (Results from interview with customer)" are reproduced.
NOTE:
Although unit-related error symptoms occur, do not confuse them with other symptoms.
Inspection result
Reproduced-Connect the connector. Check other units as per the above procedure.
Non-reproduced-Replace the unit whose connector was disconnected.