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Home >> Infiniti >> 2008 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Component System Testing (VQ35DE) >> Ignition Signal >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK ENGINE START 

    Turn ignition switch OFF, and restart engine.

    Is engine running? 

    Yes or No 

    Yes (With CONSULT-III)>>GO TO  2.

    Yes (Without CONSULT-III)>>GO TO  3.

    No: GO TO  4.

  2. CHECK OVERALL FUNCTION 

    With CONSULT-III 

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

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  10.

  3. CHECK OVERALL FUNCTION 

    Without CONSULT-III 

    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 1: Signal Waveform Graph
    G05216965Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Checking Voltage Signal Between ECM Terminals 60, 61, 62, 79, 80, 81 And Ground
    G04897422Courtesy 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-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  5.

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

    Fig 3: Checking Voltage Between ECM Terminals 119, 120 And Ground
    G04900811Courtesy 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 4: Identifying Condenser
      G05216968Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between condenser terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  8.

    NG: GO TO  6.

    Fig 5: Checking Voltage Between Condenser Terminal 1 And Ground
    G04875485Courtesy 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 E64, F65
    • Harness for open or short between condenser and IPDM E/R

      >> 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 6: Identifying Ignition Coil Harness Connector (Bank 1/Bank 2)
      G05216956Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch ON.
    5. Check voltage between ignition coil terminal 3 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  12.

    NG: GO TO  11.

    Fig 7: Checking Voltage Between Ignition Coil Terminal 3 And Ground
    G04875257Courtesy of NISSAN MOTOR CO., U.S.A.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F10, F211
    • Harness for open or short between ignition coil and harness connector F65

      >> 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 F211, F10
    • 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 F10, F211
    • 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 malfunctioning ignition coil with power transistor.

  17. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    OK or NG 

    OK: Replace IPDM E/R. Refer to "IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM) "

    NG: Repair or replace.

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