Power Supply And Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK GROUND CONNECTION-I

1.Turn ignition switch OFF.
2.Check ground connection E9. 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-I

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- GO TO 3.

3. DETECT MALFUNCTIONING PART

Check the following.
- Harness connectors E11, F2
- Harness for open or short between ECM and ground
- Repair open circuit, short to power in harness or connectors.

4. CHECK ECM POWER SUPPLY CIRCUIT-I

1.Reconnect ECM harness connector.
2.Turn ignition switch OFF and then ON.





3.Check the voltage between ECM harness connectors.





Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.

5. DETECT MALFUNCTIONING PART

Check the following.
- IPDM E/R connector E18
- 10 A fuse (No. 35)
- 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 connectors.





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.

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 connectors.





Is the inspection result normal?
YES- GO TO 12.
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 11.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

11. CHECK 15 A FUSE

1.Disconnect 15 A fuse (No. 42) from IPDM E/R.
2.Check 15 A fuse.
Is the inspection result normal?
YES- GO TO 14.
NO- Replace 15 A fuse.

12. 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 14.
NO- GO TO 13.

13. DETECT MALFUNCTIONING PART

Check the following.
- Junction block connectors E44, E45
- 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.

14. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
Is the inspection result normal?
YES- Replace IPDM E/R.
NO- Repair or replace harness or connectors.