Electric Cooling Fan Diagnosis

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    Circuit Description:

    Power for the fan motors is supplied through 2 Maxifuses in the U/H Electrical Center. The cooling fan relays are energized when current flows from the 2 Maxifuses through the relay coils to ground through the PCM. The Coolant Fan #1 Rela...

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    Service Manual Table of Contents

    Document Tags

    Document Title: Electric Cooling Fan Diagnosis

    circuit

    electrical

    center

    cooling

    current

    relay

    ground

    coolant

    cool

    control

    speed

    fans

    operation

    during

    supplies

    path

    engine

    right

    motor

    running

    diagnostic

    check

    poor

    connection

    harness

    terminal

    test

    diagnosis

    replacement

    ambient

    temperature

    request

    refrigerant

    pressure

    vehicle

    powertrain

    module

    action

    value

    system

    turn

    observe

    command

    using

    scan

    tool

    output

    function

    wait

    seconds

    view

    does

    display

    conditioning

    ignition

    switch

    disconnect

    remove

    underhood

    locate

    repair

    short

    voltage

    procedures

    complete

    problem

    found

    battery

    positive

    refer

    probe

    cavity

    light

    connected

    identify

    blown

    fuse

    connect

    fused

    cavities

    install

    jumper

    connector

    open

    replace

    specified

    sensor

    digital

    multimeter

    service

    radiator

    relay cool

    relay control

    control circuit

    path cool

    engine cooling

    ground path

    right engine

    cooling fans

    powertrain control

    control module

    engine coolant

    engine running

    observe cooling

    fans cooling

    fans using

    fans running

    command speed

    running speed

    tool display

    turn ignition

    remove cool

    relay underhood

    underhood electrical

    repair procedures

    procedures electrical

    diagnosis action

    action complete

    found repair

    repair repair

    diagnosis problem

    short battery

    positive voltage

    probe cool

    relay cavity

    cavity test

    test light

    ground test

    voltage cool

    cavity repair

    connect test

    light cool

    relay cavities

    observe test

    light test

    install fused

    fused jumper

    jumper cool

    poor cool

    repair open

    check open

    replace cool

    short ground

    circuit repair

    display voltage

    pressure sensor

    sensor ground

    light battery

    vehicle service

    motor vehicle

    service cooling

    radiator action

    open battery

    relay control circuit

    right engine cooling

    ground path cool

    diagnostic trouble codes

    enable cooling fans

    powertrain control module

    control module replacement

    module replacement programming

    powertrain board diagnostic

    engine coolant temperature

    observe cooling fans

    cooling fans cooling

    speed fans using

    fans using scan

    fans cooling fans

    cooling fans running

    command speed fans

    fans running speed

    request scan tool

    scan tool display

    control module controlled

    turn ignition switch

    cooling fans engine

    fans engine cooling

    relay underhood electrical

    repair procedures electrical

    diagnosis action complete

    problem found repair

    found repair repair

    repair repair procedures

    diagnosis problem found

    cooling fans right

    fans right engine

    repair short battery

    short battery positive

    battery positive voltage

    found repair necessary

    refer repair procedures

    ignition engine running

    relay cavity test

    cavity test light

    test light connected

    ground test light

    identify battery positive

    positive voltage cool

    relay cavity blown

    fuse fuse blown

    fuse blown locate

    repair battery positive

    relay cavity repair

    cavity repair procedures

    connect test light

    test light cool

    observe test light

    test light test

    light test light

    reconnect cooling fans

    install fused jumper

    fused jumper cool

    check poor cool

    test light ground

    light ground test

    locate repair open

    electrical center cavities

    does scan tool

    short ground cool

    circuit repair procedures

    pressure scan tool

    tool display voltage

    display voltage specified

    refrigerant pressure sensor

    pressure signal circuit

    digital multimeter connected

    pressure sensor ground

    does digital multimeter

    digital multimeter display

    multimeter display voltage

    light battery positive

    pressure sensor volt

    repair open short

    install test light

    wait approx seconds

    with test light

    test light battery

    motor vehicle service

    vehicle service cooling

    radiator action complete

    repair open battery

    open battery positive

    positive voltage circuit

    underhood electrical center