Diagnostic Procedure

Start engine.

Is engine running? 

Yes or No 

1. Yes : GO TO  4.
2. No : GO TO 2.

1. Turn ignition switch OFF and then ON.
2. Check voltage between ECM terminal 24 and ground with CONSULT-II or tester.

   Voltage : Battery voltage 

OK or NG 

1. OK : GO TO  12.
2. NG : GO TO 3.
   Fig 1: Checking Voltage Between ECM Terminal And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

Check the following.

• Harness connectors M65, E43
• Harness connectors M59, F27
• Fuse block (J/B) connector E49
• 10A fuse
• Harness for open or short between ECM and fuse
  1. : Repair harness or connectors.

1. Stop engine.
2. Check voltage between ECM terminal 80 and ground with CONSULT-II or tester.

   Voltage : Battery voltage 

OK or NG 

1. OK : GO TO  6.
2. NG : GO TO 5.
   Fig 2: Checking Voltage Between ECM Terminal And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

Check the following.

• Harness connectors M81, F36
• Fuse block (J/B) connector M27
• 10A fuse
• Harness for open or short between ECM and fuse
  1. : Repair harness or connectors.

1. Turn ignition switch ON and then OFF.
2. Check voltage between ECM terminals 67, 72, 117 and ground with CONSULT-II or tester.

   Voltage : After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0V. 

OK or NG 

1. OK : GO TO  12.
2. NG (Battery voltage does not exist.) : GO TO 7.
3. NG (Battery voltage exists for more than a few seconds.) : GO TO  11.
   Fig 3: Checking Voltage Between ECM Terminals And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

1. Disconnect ECM harness connector.
2. Disconnect ECM relay.
3. Check harness continuity between ECM terminals 67, 72, 117 and ECM relay terminal 3.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

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

OK or NG 

1. OK : GO TO 8
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.
   Fig 4: Identifying Location Of ECM And ECM Relay

   Courtesy of NISSAN MOTOR CO., U.S.A.

Check voltage between ECM relay terminals 2, 5 and ground with CONSULT-II or tester.

Voltage : Battery voltage 

OK or NG 

1. OK : GO TO  10.
2. NG : GO TO 9.
   Fig 5: Checking Voltage Between ECM Relay Terminals And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.

Check the following.

• Harness for open or short between ECM relay and harness connector F36
  1. : Repair harness or connectors.

1. Check harness continuity between ECM terminal 4 and ECM relay terminal 1.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

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

OK or NG 

1. OK : GO TO 11.
2. NG : Repair open circuit or short to ground or short to power in harness or connectors.

1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between ECM relay terminals 3 and 5.

   12V (1 - 2) applied : Continuity exists. 

   No voltage applied : No continuity 

OK or NG 

1. OK : GO TO 12.
2. NG : Replace ECM relay.
   Fig 6: Checking Continuity Between ECM Relay Terminals

   Courtesy of NISSAN MOTOR CO., U.S.A.

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 10, 19, 25, 32, 116, 124 and engine ground.

   Refer to WIRING DIAGRAM .

   Continuity should exist. 

4. Also check harness for short to power.

OK or NG 

1. OK : GO TO 13.
2. NG : Repair open circuit or short to power in harness or connectors.

Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

1. : INSPECTION END.