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:

    Around View Monitor system limitations
    WARNING Listed below are the system limitations for Around View Monitor. Failure to operate the vehicle in accordance with these system limitations could result in serious injury or death. Do not use the Around View Monitor with the outside mirrors in the stored position, and make ...

    Rear door speaker
    Description The AV control unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the rear door speakers using the audio signal circuits. Diagnosis Procedure 1.CONNECTOR CHECK Check the AV control unit, BOSE speaker amp. a ...

    Evap leak check
    Inspection CAUTION:  Never use compressed air or a high pressure pump.  Never exceed 4.12 kPa (0.042 kg/cm2, 0.6 psi) of pressure in EVAP system. NOTE:  Do not start engine.  Improper installation of  EVAP service port adapter (commercial service tool) ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2019 Copyright www.nimainfo.com
    0.0126