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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ENGINE START 

    Turn ignition switch OFF, and restart engine.

    Is engine running? 

    Yes or No

    • Yes (With CONSULT-II): GO TO 2.
    • Yes (Without CONSULT-II): GO TO  3.
    • No: GO TO  4.
  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    2. Make sure that each circuit produces a momentary engine speed drop.

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO  10.
    Fig 1: Scan Tool Display "Active Test"
    G02402162Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK OVERALL FUNCTION 

    Without CONSULT-II 

    1. Let engine idle.
    2. Read the voltage signal between ECM terminals 60, 61, 62, 79, 80, 81 and ground with an oscilloscope.
    3. Verify that the oscilloscope screen shows the signal wave as shown below.
      NOTE: The pulse cycle changes depending on RPM at idle.
      Fig 2: Pulse Cycle
      G02402163Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: ECM Connector Terminals 60, 61, 62, 79, 80, 81 & Ground Voltage Test
      G02402164Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: INSPECTION END 
    • NG: GO TO  10.
  4. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
    2. Check voltage between ECM terminals 119, 120 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    Fig 4: ECM Connector Terminals 119, 120 & Ground Voltage Test
    G02402165Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect condenser harness connector.
    3. Turn ignition switch ON.
      Fig 5: Disconnecting Condenser Harness Connector
      G02402166Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  8.
    • NG: GO TO 6.
    Fig 6: Condenser Terminal 1 & Ground Voltage Test
    G02402167Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector E7.
    3. Check harness continuity between IPDM E/R terminal 17 and condenser terminal 1.

      Refer to WIRING DIAGRAM 

      • Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  17.
    • NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following

    • Harness connectors E12, F3
    • Harness for open or short between IPDM E/R and condenser
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK CONDENSER GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between condenser terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    3. Also check harness for short to power.

    OK or NG

    • OK: GO TO 9.
    • NG: Repair open circuit or short to power in harness or connectors.
  9. CHECK CONDENSER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 10.
    • NG: Replace condenser.
  10. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect ignition coil harness connector.
      Fig 7: Disconnecting Ignition Coil Harness Connector
      G02402168Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch ON
    5. Check voltage between ignition coil terminal 3 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG

    • OK: GO TO  12.
    • NG: GO TO 11.
    Fig 8: Ignition Coil Terminal 3 & Ground Voltage Test
    G02402169Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F18, F201
    • Harness for open or short between ignition coil and harness connector F3
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  12. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between ignition coil terminal 2 and ground.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    3. Also check harness for short to power.

    OK or NG

    • OK: GO TO  14.
    • NG: GO TO 13.
  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F18, F201
    • Harness for open or short between ignition coil and ground
      • : Repair open circuit or short to power in harness or connectors.
  14. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminals 60, 61, 62, 79, 80, 81 and ignition coil terminal 1.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  16.
    • NG: GO TO 15.
  15. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F18, F201
    • Harness for open or short between ignition coil and ECM
      • : Repair open circuit or short to ground or short to power in harness or connectors.
  16. CHECK IGNITION COIL WITH POWER TRANSISTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 17.
    • NG: Replace ignition coil with power transistor.
  17. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG

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