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Home >> Nissan-Datsun >> 2005 >> Pathfinder LE, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> Ignition Signal >> Diagnostic Procedure

Diagnostic Procedure

  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.
      Fig 1: CONSULT-II Display - Active Test Mode
      G02432457Courtesy of NISSAN MOTOR CO., U.S.A.
    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-II 

    1. Let engine idle.
    2. Read the voltage signal between ECM terminals 60, 61, 62, 79, 80, 81 and ground with an oscilloscope. Refer to Fig 2.
    3. Verify that the oscilloscope screen shows the signal wave as shown Fig 3.
      NOTE: The pulse cycle changes depending on rpm at idle.
      Fig 2: Checking Voltage Between ECM Terminals 60, 61, 62, 79, 80, 81 And Ground
      G02432459Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Signal Waveform Graph
      G02432458Courtesy 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 
      Fig 4: Checking Voltage Between ECM Connector Terminals 119, 120 & Ground
      G02432460Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  5. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect condenser harness connector.
      Fig 5: Locating Condenser
      G02432461Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 
      Fig 6: Checking Voltage Between Condenser Connector Terminal 1 And Ground
      G02432462Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO  8.
    • NG: GO TO 6.
  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 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 E2, F32
    • 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-V 
    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect ignition coil harness connector.
      Fig 7: Locating Ignition Coil Harness Connector
      G02432463Courtesy 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 
      Fig 8: Checking Voltage Between Ignition Coil Connector Terminal 3 And Ground
      G02432464Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 12.
    • NG: GO TO 11.
  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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