Nissan Maxima Service and Repair Manual: Fuel pump

Description

Nissan Maxima. Description

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine start ability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Nissan Maxima. Description

Component Function Check

1.CHECK FUEL PUMP FUNCTION

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

Nissan Maxima. CHECK FUEL PUMP FUNCTION

: Vehicle front (Illustration shows the view with intake air duct removed)

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

Diagnosis Procedure

1.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

Nissan Maxima. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

  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.

Nissan Maxima. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

2.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Nissan Maxima. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Check the voltage between IPDM E/R harness connector and ground.

Nissan Maxima. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

3.DETECT MALFUNCTIONING PART

Check the following.

  • IPDM E/R harness connector F10
  • Harness for open or short between IPDM E/R and ECM

4.CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III

  1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
  2. Check harness continuity between IPDM E/R harness connector and "fuel level sensor unit and fuel pump" harness connector

Nissan Maxima. CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III

5.DETECT MALFUNCTIONING PART

Check the following.

  • Harness connectors B10, E29
  • Harness for open or short between "fuel level sensor unit and fuel pump" and IPDM E/R

6.CHECK FUEL PUMP GROUND CIRCUIT

  1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
  2. Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ground.

Nissan Maxima. CHECK FUEL PUMP GROUND CIRCUIT

7.CHECK FUEL PUMP

8.CHECK INTERMITTENT INCIDENT

Component Inspection

1.CHECK FUEL PUMP

Nissan Maxima. CHECK FUEL PUMP

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

Nissan Maxima. CHECK FUEL PUMP

    Fuel injector
    Description The fuel injector is a small, precise solenoid valve. When the ECM supplies a ground to the fuel injector circuit, the coil in the fuel injector is energized. The energized coil p ...

    Ignition signal
    Description The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induc ...

    Other materials:

    System maintenance
    The two radar sensors 1 for the BSW and RCTA systems are located near the rear bumper. Always keep the area near the radar sensors clean. The radar sensors may be blocked by temporary ambient conditions such as splashing water, mist or fog. The blocked condition may also be caused b ...

    Spark Plug
    Exploded View Ignition coil Spark plug Rocker cover (RH) Rocker cover (LH) Removal and Installation REMOVAL Remove the ignition coil. Refer to EM-42, "Removal and Installation (LH)" and EM-42, "Removal and Installation (RH)". Remove the spark plug with a suitable spark p ...

    Troubleshooting guide
    Verify the location of all Intelligent Keys that are programmed for the vehicle. If another Intelligent Key is in range or inside the vehicle, the vehicle system may respond differently than expected. Symptom Possible Cause Remedy When pushing the ignition switch to sto ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2021 Copyright www.nimainfo.com
    0.0116