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Home >> Nissan-Datsun >> 2017 >> Murano SL, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 4) >> DTC / Circuit Diagnosis >> DTC P1220: Fuel Pump Control Module (FPCM) >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUEL PUMP CONTROL MODULE POWER SUPPLY CIRCUIT-I

    1. Turn ignition switch OFF.
    2. Disconnect Fuel pump control module harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between Fuel pump control module harness connector and ground.
      Fuel pump control module Ground Voltage
      Connector Terminal
      B37 6 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 2  .

  2. CHECK FUEL PUMP CONTROL MODULE 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 Fuel pump control module harness connector.
      IPDM E/R Fuel pump control module Continuity
      Connector Terminal Connector Terminal
      E121 15 B37 6 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Repair open circuit, short to ground or short to power in harness or connectors.

  3. 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.

  4. CHECK FUEL PUMP CONTROL MODULE GROUND CIRCUIT FOR OPEN AND SHORT

    1. Turn ignition switch OFF.
    2. Check the continuity between Fuel pump control module harness connector and ground.
      Fuel pump control module Ground Continuity
      Connector Terminal
      B37 3 Ground Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair open circuit or short to power in harness or connectors.

  5. CHECK FUEL PUMP CONTROL MODULE INPUT AND OUTPUT CIRCUITS FOR OPEN AND SHORT

    1. Disconnect ECM harness connector.
    2. Check the continuity between Fuel pump control module harness connector and ECM harness connector.
      Fuel pump control module ECM Continuity
      Connector Terminal Connector Terminal
      B37 5 E32 136 Existed
      4 130
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK FUEL PUMP CONTROL CIRCUIT FOR OPEN AND SHORT

    1. Disconnect "fuel level sensor unit" harness connector.
    2. Check the continuity between Fuel pump control module harness connector and "fuel level sensor unit" harness connector.
      Fuel pump control module Fuel level sensor unit Continuity
      Connector Terminal Connector Terminal
      B37 1 B72 6 Existed
      2 4

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK FUEL PUMP

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

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Replace fuel pump. Refer to REMOVAL AND INSTALLATION .

  8. CHECK FUEL PUMP CONTROL MODULE

    Check Fuel pump control module. Refer to COMPONENT INSPECTION (FUEL PUMP CONTROL MODULE) .

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    Replace fuel pump. Refer to REMOVAL AND INSTALLATION .

  9. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    Repair or replace malfunctioning part.

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