Power Supply And Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT





Diagnosis Procedure
1.CHECK FUSE
Check that the following fuse is not fusing.





Is the fuse fusing?
YES - Replace the fuse after repairing the applicable circuit.
NO - GO TO 2.
2.CHECK GROUND CONNECTION
1. Check ground connection M11, M95 and M95. Main Harness.
Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace ground connection.
3.CHECK ECM GROUND CIRCUIT
1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and ground.





3. Also check harness for short to power.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair open circuit in harness or connectors.
4.CHECK ECM POWER SUPPLY (MAIN)-1
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 5.
5.CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector and IPDM E/R harness connector.
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.





Is the inspection result normal?
YES - Replace IPDM E/R. Removal And Installation.
NO - Repair harness or connectors.
6.CHECK ECM POWER SUPPLY (MAIN)-2
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Check the voltage between ECM harness connector terminals as per the following.





Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 7.
7.CHECK ECM RELAY CONTROL SIGNAL
1. Check the voltage between ECM harness connector terminals as per the following.





Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident.
NO - GO TO 8.
8.CHECK ECM RELAY CONTROL CIRCUIT
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - Replace IPDM E/R. Removal And Installation.
NO - Repair harness or connectors.
9.CHECK IGNITION SWITCH SIGNAL
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector terminals.





Is the inspection result normal?
YES - GO TO 11.
NO - GO TO 10.
10.CHECK IGNITION SWITCH SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - Replace IPDM E/R. Removal And Installation.
NO - Repair harness or connectors.
11.CHECK ECM POWER SUPPLY (BACK-UP)
1. Reconnect ECM harness connector.
2. Turn ignition switch OFF.
3. Check the voltage between ECM harness connector terminals.





Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 12.
12.CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between ECM harness connector and IPDM E/R harness connector.





4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - Replace IPDM E/R. Removal And Installation.
NO - Repair harness or connectors.