Power Supply And Ground Circuit
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
1. CHECK FUSE
Check that there is no blowout in the following fuses.
Is the fuse fusing?
YES- Replace the fuse after repairing the applicable circuit.
NO- GO TO 2.
2. CHECK GROUND CONNECTION
1.Turn ignition switch OFF.
2.Check ground connection E9. Refer to "Circuit Inspection" Circuit Inspection.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace ground connection.
3. CHECK ECM GROUND CIRCUIT
1.Disconnect ECM harness connectors.
2.Check the continuity between ECM harness connector and ground.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace error-detected parts.
4. CHECK ECM POWER SUPPLY (MAIN)-I
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 6.
NO- GO TO 5.
5. CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connectors.
3.Disconnect IPDM E/R harness connector.
4.Check the continuity between ECM harness connector and IPDM E/R harness connector.
5.Also check harness for short to ground.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.
6. CHECK ECM POWER SUPPLY (MAIN)-II
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
Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 8.
8. CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Disconnect IPDM E/R harness connector.
4.Check the continuity between ECM harness connector and IPDM E/R harness connector.
5.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- Replace IPDM E/R. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace error-detected parts.
9. CHECK IGNITION SWITCH SIGNAL
1.Turn ignition switch ON.
2.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.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Disconnect IPDM E/R harness connector.
4.Check the continuity between ECM harness connector and IPDM E/R harness connector.
5.Also check harness for short to ground and to power.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.
11. CHECK ECM POWER SUPPLY (BACK-UP)
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- GO TO 12.
12. CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Disconnect IPDM E/R harness connector.
4.Check the continuity between ECM harness connector and IPDM E/R harness connector.
5.Also check harness for short to ground.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.