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Nissan Sentra B18 (2020-2025) Service Manual: Low Pressure Fuel Pump

Component Function Check

Component Function Check

  1. CHECK LOW PRESSURE FUEL PUMP FUNCTION

    1. Turn ignition switch ON.

    2. Pinch fuel feed hose with two fingers.

      Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUEL PUMP RELAY POWER SUPPLY

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between ECM harness connector terminals.

      ECM

      Voltage

      Connector

      Terminal

      Connector

      Terminal

      F25

      118

      E16

      162

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    GO TO 2.

  2. CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect IPDM E/R harness connector.

    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

      ECM

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F25

      118

      F96

      76

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  3. CHECK FUEL PUMP POWER SUPPLY

    1. Turn ignition switch OFF.

    2. Reconnect ECM harness connector.

    3. Disconnect “fuel level sensor unit and fuel pump” harness connector.

    4. Turn ignition switch ON.

    5. Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.

      +

      −

      Voltage

      Fuel level sensor unit and fuel pump

      Connector

      Terminal

      B48

      8

      Ground

      Battery voltage should exist 1 second after ignition switch is turn ON.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    GO TO 4.

  4. CHECK FUEL PUMP POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect IPDM E/R harness connector.

    3. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and IPDM E/R harness connector.

      Fuel level sensor unit and fuel pump

      IPDM E/R

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B48

      8

      E45

      46

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    Perform trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK FUEL PUMP GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Check the continuity between “fuel level sensor unit and fuel pump” harness connector and ground.

      Fuel level sensor unit and fuel pump

      —

      Continuity

      Connector

      Terminal

      B48

      7

      Ground

      Existed

    3. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK FUEL PUMP

    Check fuel pump. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Replace “fuel level sensor unit and fuel pump”. Refer to Removal and Installation.

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