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Nissan Sentra Service Manual: Fuel pump

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / Fuel pump

Component Function Check

1.CHECK FUEL PUMP FUNCTION

  1. Turn ignition switch ON.
  2. Pinch fuel feed hose two fingers. with
    two fingers.

Fuel pressure pulsation should be felt on the fuel feed


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 >> Proceed to EC-453, "Diagnosis Procedure".

Diagnosis Procedure

1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-1

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between ECM harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 3.

NO >> GO TO 2.

2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-2

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Check the continuity between IPDM E/R harness connector and ECM harness connector.


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

Is the inspection result normal? YES >> GO TO 8.

NO >> Repair or replace error-detected parts.

3.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-3

  1. Turn ignition switch OFF.
  2. Reconnect all harness connectors disconnected.
  3. Disconnect fuel pump harness connector.
  4. Turn ignition switch ON.
  5. Check the voltage between fuel pump harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 6.

NO >> GO TO 4.

4.CHECK FUSE

  1. Turn ignition switch OFF.
  2. Disconnect 15A fuse (No. 50) from IPDM E/R.
  3. Check 15A fuse.

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace 15A fuse.

5.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-4

  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 harness connector.


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

Is the inspection result normal? YES >> GO TO 6.

NO >> Repair or replace error-detected parts.

6.CHECK FUEL PUMP GROUND CIRCUIT

  1. Turn ignition switch OFF.
  2. Check the continuity between fuel pump harness connector and ground.


  1. Also check harness for short to power.

Is the inspection result normal? YES >> GO TO 7.

NO >> Repair or replace error-detected parts.

7.CHECK FUEL PUMP

Check fuel pump. Refer to EC-455, "Component Inspection (Fuel Pump)".

Is the inspection result normal? YES >> GO TO 8.

NO >> Replace fuel filter and fuel pump. Refer to FL-6, "Exploded View".

8.CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to GI-39, "Intermittent Incident".

Is the inspection result normal? YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation" (With intelligent key) or PCS-58, "Removal and Installation" (Without intelligent key).

NO >> Repair or replace error-detected parts.

Component Inspection (Fuel Pump)

1.CHECK FUEL PUMP

  1. Turn ignition switch OFF
  2. Disconnect fuel level sensor unit and fuel pump harness connector.
  3. Check resistance between fuel pump terminals as follows.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace fuel filter and fuel pump. Refer to FL-6, "Removal and Installation".

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Other materials:

When reading the manual
This manual includes information for all features and equipment available on this model. Features and equipment in your vehicle may vary depending on model, trim level, options selected, order, date of production, region or availability. Therefore, you may find information about features or eq ...

Basic inspection
Diagnosis and repair work flow Work flow Overall sequence Detailed flow 1.Get information for symptom Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the “diagnostic work sheet”. ( ...

Normal operating condition
Description FUEL CUT CONTROL (AT NO LOAD AND HIGH ENGINE SPEED) If the engine speed is above 2,500 rpm under no load (for example, the selector lever position is neutral and engine speed is over 2,500 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies b ...

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