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. Turn ignition switch OFF.
2. Check ground connection E21 and E38. 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 5.
NO - GO TO 6.
5.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.
6.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.
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. 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. IPDM E/R (With I-Key).
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. 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.