CAN

ECM 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).
- ECM
- Harness connector E7
- Harness connector M69
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 ECM.
2. Check the resistance between the ECM harness connector terminals.





Is the measurement value within the specification?
YES - GO TO 3.
NO - Repair the ECM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to the following.
- HR16DE: POWER SUPPLY AND GROUND CIRCUIT
- MR18DE: POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES (Present error)-Replace the ECM. Refer to the following.
- HR16DE: Special Repair Requirement
- MR18DE:
YES (Past error)-Error was detected in the ECM branch line.
NO - Repair the power supply and the ground circuit.