Power Supply And Ground Circuit

POWER SUPPLY AND GROUND CIRCUIT





Diagnosis Procedure
1.CHECK GROUND CONNECTION-I
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-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 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 or 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.
8.CHECK INTERMITTENT INCIDENT
Circuit Inspection.
- INSPECTION END
9.CHECK ECM POWER SUPPLY CIRCUIT-III
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 13.
NO - GO TO 10.
10.CHECK ECM POWER SUPPLY CIRCUIT-IV
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 or 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-IV
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 or 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.
NO - Repair open circuit or short to ground or short to power in harness or connectors.