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Home >> Nissan-Datsun >> 2008 >> Altima Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - Component Testing (Qr25DE Except Hybrid) (For CALIFORNIA) >> Ignition Signal >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
    2. Check the voltage between ECM harness connector and ground.
      VOLTAGE REFERENCE CHART

      ECM Ground Voltage
      Connector Terminal
      E10 105 Ground Battery voltage

    Is the inspection result normal? 

    YES : GO TO 2.

    NO : Go to "DIAGNOSIS PROCEDURE ".

  2. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect condenser-2 harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between condenser-2 harness connector and ground.
      VOLTAGE REFERENCE CHART

      Condenser Ground Voltage
      Connector Terminal
      F26 1 Ground Battery voltage

    Is the inspection result normal? 

    YES : GO TO  4.

    NO : GO TO 3.

  3. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector F10.
    3. Check the continuity between IPDM E/R harness connector and condenser-2 harness connector.
      CONTINUITY REFERENCE CHART

      IPDM E/R Condenser-2 Continuity
      Connector Terminal Connector Terminal
      F10 53 F26 1 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES : Go to "DIAGNOSIS PROCEDURE ".

    NO : Repair open circuit or short to ground or short to power in harness or connectors.

  4. CHECK CONDENSER-2 GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check the continuity between condenser-2 harness connector and ground.
      CONTINUITY REFERENCE CHART

      Condenser-2 Ground Continuity
      Connector Terminal
      F26 2 Ground Existed
    3. Also check harness for short to power.

    Is the inspection result normal? 

    YES : GO TO 5.

    NO : Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK CONDENSER

    Refer to "COMPONENT INSPECTION (CONDENSER-2) "

    Is the inspection result normal? 

    YES : GO TO 6.

    NG : Replace condenser.

  6. CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
    1. Reconnect all harness connectors disconnected.
    2. Disconnect ignition coil harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ignition coil harness connector and ground.
      VOLTAGE REFERENCE CHART

      Ignition coil Ground Voltage
      Cylinder Connector Terminal
      1 F34 3 Ground Battery voltage
      2 F35 3
      3 F36 3
      4 F37 3

    Is the inspection result normal? 

    YES : GO TO 7.

    NO : Repair open circuit or short to ground or short to power in harness or connectors.

  7. CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check the continuity between ignition coil harness connector and ground.
      CONTINUITY REFERENCE CHART

      Ignition coil Ground Continuity
      Cylinder Connector Terminal
      1 F34 2 Ground Existed
      2 F35 2
      3 F36 2
      4 F37 2
    3. Also check harness for short to power.

    Is the inspection result normal? 

    YES : GO TO 8.

    NO : Repair open circuit or short to ground or short to power in harness or connectors.

  8. CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ignition coil harness connector.
      ECM CONTINUITY REFERENCE CHART

      Ignition coil ECM Continuity
      Cylinder Connector Terminal Connector Terminal
      1 F34 1 F14 11 Existed
      2 F35 1 10
      3 F36 1 9
      4 F37 1 21
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES : GO TO 9.

    NO : Repair open circuit or short to ground or short to power in harness or connectors.

  9. CHECK IGNITION COIL WITH POWER TRANSISTOR

    Refer to "COMPONENT INSPECTION (IGNITION COIL WITH POWER TRANSISTOR) ".

    Is the inspection result normal? 

    YES : GO TO 10.

    NO : Replace malfunctioning ignition coil with power transistor.

  10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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