Nissan Altima 2007-2012 Service Manual: Power supply and ground circuit

Diagnosis Procedure

1.INSPECTION START

Start engine.

Is engine running? YES >> GO TO 8.

NO >> GO TO 2.

2.CHECK ECM POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF and then ON.

2. Check the voltage between ECM harness connector and ground.


Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 3.

3.DETECT MALFUNCTIONING PART

Check the following.

• IPDM E/R harness connector E18 • 10A fuse (No. 35) • Harness for open or short between ECM and fuse >> Repair open circuit or short to ground or short to power in harness or connectors.

4.CHECK GROUND CONNECTION-I

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in GI-45, "Circuit Inspection".

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace ground connection.

5.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1. Disconnect ECM harness connectors.

2. Check the continuity between ECM harness connector and ground.

3. Also check harness for short to power.


3. Also check harness for short to power.

Is the inspection result normal? YES >> GO TO 7.

NO >> GO TO 6.

6.DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

7.CHECK ECM POWER SUPPLY CIRCUIT-II

1. Reconnect ECM harness connectors.

2. Turn ignition switch ON.

3. Check the voltage between IPDM E/R harness connector and ground.


Is the inspection result normal?


Is the inspection result normal? YES >> Go to EC-470, "Diagnosis Procedure".

NO >> GO TO 8.

8.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 and ground.


Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 14.

NO-1 >> Battery voltage does not exist: GO TO 9.

NO-2 >> Battery voltage exists for more than a few seconds: GO TO 12.

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 and ground.


Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 10.

NO >> GO TO 12.

10.CHECK ECM POWER SUPPLY CIRCUIT-V

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector E18.

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.


4. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 17.

NO >> GO TO 11.

11.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 or short to ground or short to power in harness or connectors.

12.CHECK ECM POWER SUPPLY CIRCUIT-VI

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector F10.

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.


4. Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 13.

NO >> Repair open circuit or short to ground or short power in harness or connectors.

13.CHECK 15A FUSE

1. Disconnect 15A fuse (No. 42) from IPDM E/R.

2. Check 15A fuse.

Is the inspection result normal? YES >> GO TO 17.

NO >> Replace 15A fuse.

14.CHECK GROUND CONNECTION-II

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in GI-45, "Circuit Inspection".

Is the inspection result normal? YES >> GO TO 15.

NO >> Repair or replace ground connection.

15.CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect ECM harness connector.

2. Check the continuity between ECM harness connector and ground.

3. Also check harness for short to power.


3. Also check harness for short to power.

Is the inspection result normal? YES >> GO TO 17.

NO >> GO TO 16.

16.DETECT MALFUNCTIONING PART

Check the following.

• Harness or connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

17.CHECK INTERMITTENT INCIDENT

Refer to GI-42, "Intermittent Incident".

Is the inspection result normal? YES >> Replace IPDM E/R.

NO >> Repair open circuit or short to power in harness or connectors.

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