Toyota
Jeep Cherokee
 Service Manual
Fuel system » Fuel injection system » Description and operation
Fuel pump relay-pcm output

DESCRIPTION

The 5-pin, 12-volt, fuel pump relay is located in the Power Distribution Center (PDC). Refer to the label on the PDC cover for relay location.

OPERATION

The Powertrain Control Module (PCM) energizes the electric fuel pump through the fuel pump relay.

The fuel pump relay is energized by first applying battery voltage to it when the ignition key is turned ON, and then applying a ground signal to the relay from the PCM.

Whenever the ignition key is turned ON, the electric fuel pump will operate. But, the PCM will shutdown the ground circuit to the fuel pump relay in approximately 1-3 seconds unless the engine is operating or the starter motor is engaged.

    More about «Description and operation»:

    Powertrain control module (PCM)

    Modes of operation

    Automatic shutdown (asd) relay sense-pcm input

    Battery voltage-pcm input

    Brake switch-pcm input

    Five volt sensor supplies-primary and secondary

    Fuel level sensor-pcm input

    Engine coolant temperature sensor-pcm input

    Extended idle switch-pcm input

    Oxygen sensor-pcm input

    Ignition circuit sense-pcm input

    Intake manifold air temperature sensor-pcm input

    Manifold absolute pressure (map) sensor-pcm input

    Oil pressure sensor-pcm input

    Power grounds

    Power steering pressure switch- pcm input

    Sensor return-pcm input

    Throttle position sensor (tps)-pcm input

    Vehicle speed and distance sensor- pcm input

    Auto shutdown (asd) relay-pcm output

    CCD bus (+/-) circuits-pcm outputs

    Data link connector-pcm input and output

    Fuel injectors-pcm output

    Fuel pump relay-pcm output

    Idle air control (iac) motor-pcm output

    Radiator fan relay-pcm output

    Throttle body

    Jeep Cherokee Service Manual / Fuel system / Fuel injection system / Description and operation / Fuel pump relay-pcm output

    Jeep Cherokee Service Manual

    Categories


    © 2017-2024 Copyright www.jcherokee.com