Nissan Maxima Service and Repair Manual: Power supply and ground circuit

Diagnosis Procedure

1.CHECK GROUND CONNECTION-I

  1. Turn ignition switch OFF.
  2. Check ground connection E9. Refer to Ground Inspection

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.

Nissan Maxima. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

3.DETECT MALFUNCTIONING PART

Check the following.

  • Harness connectors E11, F2
  • Harness for open or short between ECM and ground

4.CHECK ECM POWER SUPPLY CIRCUIT-I

Nissan Maxima. 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.

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-I

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

6.CHECK ECM POWER SUPPLY CIRCUIT-II

Nissan Maxima. 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.

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-II

7.CHECK ECM POWER SUPPLY CIRCUIT-III

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-III

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

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-III

8.CHECK INTERMITTENT INCIDENT

9.CHECK ECM POWER SUPPLY CIRCUIT-IV

Nissan Maxima. 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.

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-IV

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.

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-V

11.CHECK 15 A FUSE

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

Nissan Maxima. CHECK ECM POWER SUPPLY CIRCUIT-VI

13.DETECT MALFUNCTIONING PART

Check the following.

  • Junction block connectors E44, E45
  • Harness for open or short between ECM and IPDM E/R

14.CHECK INTERMITTENT INCIDENT

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