LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2012 >> Quest SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Fuel Pump >> Diagnosis Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis Procedure

  1. CHECK FPCM POWER SUPPLY CIRCUIT-I
    1. Turn ignition switch OFF.
    2. Disconnect FPCM harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between FPCM harness connector and ground.
      FPCM Ground Voltage
      Connector Terminal
      B41 10 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 2.

  2. CHECK FPCM POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between IPDM E/R harness connector and FPCM harness connector.
      IPDM E/R FPCM Continuity
      Connector Terminal Connector Terminal
      E10 13 B41 10 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 3.

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

  3. CHECK FUSE
    1. Disconnect 15 A fuse (No. 41) from IPDM E/R.
    2. Check 15 A fuse.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace 15 A fuse.

  4. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

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

  5. CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check the continuity between FPCM harness connector and ground.
      FPCM Ground Continuity
      Connector Terminal
      B41 5 Ground Existed
    3. Also check harness for short to power.

      Is the inspection result normal? 

      YES: GO TO 6.

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

  6. CHECK FPCM INPUT AND OUTPUT CIRCUITS FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between FPCM harness connector and ECM harness connector.
      FPCM ECM Continuity
      Connector Terminal Connector Terminal
      B41 8 F7 21 Existed
      9 20
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 7.

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

  7. CHECK FUEL PUMP CONTROL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect "fuel level sensor unit" harness connector.
    2. Check the continuity between FPCM harness connector and "fuel level sensor unit" harness connector.
      FPCM Fuel level sensor unit Continuity
      Connector Terminal Connector Terminal
      B41 6 B40 3 Existed
      7 1

      Is the inspection result normal? 

      YES: GO TO 8.

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

  8. CHECK FUEL PUMP

    Check fuel pump. Refer to "COMPONENT INSPECTION (FUEL PUMP) ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Replace fuel pump. Refer to "EXPLODED VIEW ".

  9. CHECK FPCM

    Check FPCM. Refer to "COMPONENT INSPECTION (FPCM) ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Replace fuel pump. Refer to "EXPLODED VIEW ".

  10. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    : Repair or replace malfunctioning part.

scientia non olet · About LEMON Manuals