Diagnosis Procedure

POWER SUPPLY AND GROUND CIRCUIT


Diagnosis Procedure

1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections M16, M70. Refer to Power Supply and Ground Circuit.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connections.
2.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
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 F102, M72
- 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 M72, F102
- Fuse block (J/B) connector M4
- 15 A fuse (No. 1)
- 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 per the following.





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
Refer to Description.
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 as per the following.





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 connectors E11, F2
- 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 20 A FUSE
1. Disconnect 20 A fuse (No. 77) from IPDM E/R.
2. Check 20 A fuse.
Is the inspection result normal?
YES - GO TO 15.
NO - Replace 20 A fuse.
13.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 15.
NO - GO TO 14.
14.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E108, M15
- 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
Refer to Description.
Is the inspection result normal?
YES - Replace IPDM E/R.
NO - Repair open circuit, short to ground or short to power in harness or connectors.