CAN

TCM BRANCH LINE CIRCUIT





Diagnosis Procedure
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).
- A/T assembly
- Harness connector F103
- Harness connector M116
Is the inspection result normal?
YES - GO TO 2.
NO - Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of A/T assembly.
2. Check the resistance between the A/T assembly harness connector terminals.





Is the measurement value within the specification?
YES - GO TO 3.
NO - Repair the TCM branch line.
3.CHECK HARNESS FOR OPEN CIRCUIT
1. Remove the joint connector. Refer to the following.
- VQ engine models: Removal and Installation
- VK engine models: Removal and Installation
2. Check the continuity between the A/T assembly harness connector side and the TCM harness connector side of the joint connector.





Is the inspection result normal?
YES - GO TO 4.
NO - Replace the joint connector.
4.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to the following.
- VQ engine models: Main Power Supply And Ground Circuit
- VK engine models: Main Power Supply And Ground Circuit
Is the inspection result normal?
YES (Present error)-Replace the control valve & TCM. Refer to the following.
- VQ engine models: Removal and Installation
- VK engine models: Removal and Installation
YES (Past error)-Error was detected in the TCM branch line.
NO - Repair the power supply and the ground circuit.