Power Supply and Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure


1. CHECK GROUND CONNECTION

1.Turn ignition switch OFF.
2.Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.

2. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT

1.Disconnect ECM harness connector.
2.Check the continuity between ECM harness connector.





3.Also check harness for short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 3.

3. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors F103, M116
- Harness for open or short between ECM and ground
- Repair open circuit or short to power in harness or connectors.

4. CHECK ECM POWER SUPPLY CIRCUIT-I

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. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E3, F1
- IPDM E/R harness connector E7
- 10 A fuse (No. 44)
- Harness for open or short between ECM and fuse
- Repair open circuit, short to ground or short to power in harness or connectors.

6. CHECK ECM POWER SUPPLY CIRCUIT-II

1.Turn ignition switch OFF and wait at least 10 seconds.
2.Check the voltage between ECM harness connector terminals as follows.





Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 9.

7. CHECK ECM POWER SUPPLY CIRCUIT-III

1.Turn ignition switch ON.
2.Check the voltage between IPDM E/R harness connector and ground.





Is the inspection result normal?
YES- GO TO 8.
NO- Replace IPDM E/R. Removal and Installation.

8. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
- INSPECTION END

9. CHECK ECM POWER SUPPLY CIRCUIT-IV

1.Turn ignition switch OFF and wait at least 10 seconds.
2.Check the voltage between ECM harness connector terminals.





Is the inspection result normal?
YES- GO TO 13.
NO- GO TO 10.

10. CHECK ECM POWER SUPPLY CIRCUIT-V

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- GO TO 12.
NO- GO TO 11.

11. DETECT MALFUNCTIONING PART

Check the following.
- Harness or connectors E3, F1
- Harness for open or short between ECM and IPDM E/R
- Repair open circuit, short to ground or short to power in harness or connectors.

12. CHECK 15 A FUSE

1.Disconnect 15 A fuse (No. 50) from IPDM E/R.
2.Check 15 A fuse.
Is the inspection result normal?
YES- GO TO 15.
NO- Replace 15 A fuse.

13. CHECK ECM POWER SUPPLY CIRCUIT-VI

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- GO TO 15.
NO- GO TO 14.

14. DETECT MALFUNCTIONING PART

Check the following.
- Harness or connectors E106, M6
- Harness for open or short between ECM and IPDM E/R
- Repair open circuit, short to ground or short to power in harness or connectors.

15. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
Is the inspection result normal?
YES- Replace IPDM E/R. Removal and Installation.
NO- Repair open circuit, short to ground or short to power in harness or connectors.