Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

INSPECTION START
Start engine.

Is engine running?

Yes or No
1. Yes : GO TO 7.
2. No : GO TO 2.
CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF and then ON.
2. Check voltage between ECM terminal 43 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
  
  OK or NG
  
  Fig 1: Checking Voltage Between ECM Terminal 43 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
1. OK : GO TO 4.
2. NG : GO TO 3.
DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors M71, F59
- Fuse block (J/B) connector M4
- 10A fuse
- Harness for open or short between ECM and fuse
1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".
OK or NG
1. OK : GO TO 5.
2. NG : Repair or replace ground connections.
  
  Fig 2: Locating Two Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 48, 57, 106, 108 and ground.
  Refer to Wiring Diagram .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK : GO TO 6.
2. NG : Repair open circuit or short to power in harness or connectors.
CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check voltage between ECM terminal 31 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
OK or NG
1. OK : Go to "IGNITION SIGNAL ".
2. NG : GO TO 7.
  
  Fig 3: Checking Voltage Between ECM Terminal 31 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ECM POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and then OFF.
3. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.
  Voltage: After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop approximately 0V.
OK or NG
1. OK : GO TO 8.
2. NG (Battery voltage does not exist.) : GO TO 10.
3. NG (Battery voltage exists for more than a few seconds.) : GO TO 18.
  
  Fig 4: Checking Voltage Between ECM Terminals 110, 112 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check harness continuity between ECM terminal 31 and IPDM E/R terminal 17. 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 16.
2. NG : GO TO 9.
DETECT MALFUNCTIONING PART
Check the following.
- Harness or connectors E20, F32
- Harness for open or short between ECM and IPDM E/R
1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ECM POWER SUPPLY CIRCUIT-V
1. Turn ignition switch OFF.
2. Check voltage between ECM terminal 38 and ground with CONSULT-II or tester.
  Voltage: Battery voltage
OK or NG
1. OK : GO TO 11.
2. NG : GO TO 13.
  
  Fig 5: Checking Voltage Between ECM Terminal 38 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ECM POWER SUPPLY CIRCUIT-VI
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check harness continuity between ECM terminals 110, 112 and IPDM E/R terminal 18.
  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 16.
2. NG : GO TO 12.
DETECT MALFUNCTIONING PART
Check the following.
- Harness or connectors E20, F32
- Harness for open or short between ECM and IPDM E/R
1. : Repair open circuit or short to ground or short to power in harness or connectors.
CHECK ECM POWER SUPPLY CIRCUIT-VII
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector.
3. Check harness continuity between ECM terminal 38 and IPDM E/R terminal 46.
  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 15.
2. NG : GO TO 14.
DETECT MALFUNCTIONING PART
Check the following.
- Harness or connectors E20, F32
- Harness for open or short between ECM and IPDM E/R
1. Repair open circuit or short to ground or short to power in harness or connectors.
CHECK 15A FUSE
1. Disconnect 15A fuse from IPDM E/R.
2. Check 15A fuse.
OK or NG
1. OK : GO TO 18.
2. NG : Replace 15A fuse.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten two engine ground screws. Refer to "GROUND INSPECTION ".
OK or NG
1. OK : GO TO 17.
2. NG : Repair or replace ground connections.
  
  Fig 6: Locating Two Engine Ground Screws
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 48, 57, 106, 108 and ground.
  Refer to Wiring Diagram .
  
  Continuity should exist.
3. Also check harness for short to power.
OK or NG
1. OK : GO TO 18.
2. NG : Repair open circuit or short to power in harness or connectors.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

OK or NG
1. OK : Replace IPDM E/R.
2. NG : Repair open circuit or short to power in harness or connectors.