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Home › Nissan-Datsun › 2013 › Juke SL, FWD, Automatic CVT Trans › Repair and Diagnosis › Engine Performance › System › Engine Control System - Component Testing, Periodic Maintenance And Removal And Installation › Fuel Injector › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between fuel injector harness connector and ground.
      + - Voltage
      Fuel injector
      Cylinder Connector Terminal
      1 F65 1 Ground Battery voltage
      2 F66 1
      3 F67 1
      4 F68 1

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 2.

  2. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between fuel injector harness connector and ECM harness connector.
      + - Continuity
      Fuel injector ECM
      Cylinder Connector Terminal Connector Terminal
      1 F65 1 F25 3 Existed
      2 F66 1 4
      3 F67 1
      4 F68 1 3
    4. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace error-detected parts.

  3. CHECK FUEL INJECTOR DRIVER POWER SUPPLY 
    1. Reconnect ECM harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between ECM harness connector and ground.
      + - Voltage
      ECM
      Connector Terminal
      F26 49 Ground Battery voltage
      53

      Is the inspection result normal? 

      YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT "

      NO: GO TO 4.

  4. CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect fuel injector relay harness connector.
    4. Check the continuity between ECM harness connector and fuel injector relay harness connector.
      + - Continuity
      ECM Fuel injector relay
      Connector Terminal Connector Terminal
      F26 49 E57 5 Existed
      53 7
    5. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace error-detected parts

  5. CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACT SIDE) 

    Check the voltage between fuel injector relay harness connector and ground.

    + - Voltage
    Fuel injector relay
    Connector Terminal
    E57 3 Ground Battery voltage
    6

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: Perform the trouble diagnosis for power supply circuit.

  6. CHECK FUEL INJECTOR RELAY POWER SUPPLY (EXCITATION COIL SIDE) 
    1. Reconnect all harness connectors disconnected.
    2. Turn ignition switch ON.
    3. Check the voltage between fuel injector relay harness connector and ground.
      + - Voltage
      Fuel injector relay
      Connector Terminal
      E57 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7

  7. CHECK FUEL INJECTOR RELAY POWER SUPPLY CIRCUIT (EXCITATION COIL SIDE) 
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector relay harness connector.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between IPDM E/R harness connector and fuel injector harness connector.
      + - Continuity
      IPDM E/R Fuel injector relay
      Connector Terminal Connector Terminal
      E14 35 E57 1 Existed
    5. Also check harness for short to ground.

      Is the inspection result normal? 

      YES: Perform the trouble diagnosis for power supply circuit.

      NO: Repair or replace error-detected parts.

  8. CHECK FUEL INJECTOR RELAY GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector relay harness connector.
    3. Check the continuity between fuel injector relay harness connector and ground.
      + - Continuity
      Fuel injector relay
      Connector Terminal
      E57 2 Ground Existed
    4. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: Repair or replace error-detected parts.

  9. CHECK FUEL INJECTOR GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between fuel injector harness connector and ECM harness connector.
      + - Continuity
      Fuel injector ECM
      Cylinder Connector Terminal Connector Terminal
      1 F65 2 F25 5 Existed
      2 F66 2 6
      3 F67 2 7
      4 F68 2 8
    4. Also check harness for short to ground and to power.

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: Repair or replace error-detected parts.

  10. CHECK FUEL INJECTOR RELAY 

    Check the fuel injector relay. Refer to "COMPONENT INSPECTION (FUEL INJECTOR RELAY) ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT "

    NO: Replace fuel injector relay. Refer to "STANDARDIZED RELAY ".

  11. CHECK FUEL INJECTOR 

    Check the fuel injector. Refer to "COMPONENT INSPECTION (FUEL INJECTOR) ".

    Is the inspection result normal? 

    YES: Check intermittent incident. Refer to "INTERMITTENT INCIDENT "

    NO: Replace malfunctioning fuel injector. Refer to "EXPLODED VIEW ".

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