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Diagnostic Procedure

WARNING: This page is about a different car, the 2006 Nissan Xterra. 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: Consult-II ACTIVE TEST Display Screen
    G04080452Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK OVERALL FUNCTION 

    With 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: Voltage Waveform Pattern
    G04073752Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Signal Waveform Graph
    G04203320Courtesy 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 

    OK : GO TO  5.

    NG : Go to "POWER SUPPLY AND GROUND CIRCUIT ".

    Fig 4: Identifying Voltage Between ECM Terminals 119, 120 And Ground
    G04203321Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect condenser-1 harness connector.
    3. Turn ignition switch ON.
      Fig 5: Identifying Condenser-1 Harness Connector
      G04203322Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between condenser-1 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: Checking Voltage Between Terminal 1 And Ground
    G04075312Courtesy 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 E119.
    3. Check harness continuity between IPDM E/R terminal 3 and condenser-1 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. 7.DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between condenser-1 and IPDM E/R

    : Repair open circuit or short to ground or short to power in harness or connectors.

  8. CHECK CONDENSER-1 GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between condenser-1 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-1 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO  10.

    NG : Replace condenser-1.

  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: Identifying Ignition Coil Harness Connector
      G04203324Courtesy 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: Identifying Voltage Between Connector Terminal 3 and Ground
    G04075010Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F26, F125
    • Harness for open or short between ignition coil and harness connector F32

    : Repair or replace 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 F125, F26
    • 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 F26, F125
    • 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 ".

    : INSPECTION END 

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