Idle Air Control (IAC) System Check

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    Circuit Description

    The PCM controls engine idle speed by adjusting the position of the Idle Air Control (IAC) motor pintle. The IAC is a bi-directional motor driven by two coils. The PCM pulses current to the IAC coils in steps (counts) to extend the IAC pin...

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    You may preview the service manual table of contents by clicking below.

    Service Manual Table of Contents

    Document Tags

    Document Title: Idle Air Control (IAC) System Check

    engine

    idle

    speed

    control

    motor

    pintle

    passage

    throttle

    diagnostic

    check

    following

    poor

    connection

    inspect

    harness

    terminals

    damaged

    restricted

    intake

    system

    objects

    blocking

    bore

    excessive

    deposits

    plate

    vacuum

    condition

    leaks

    valve

    faulty

    powertrain

    replacement

    action

    value

    scan

    tool

    command

    problem

    found

    repair

    procedures

    electrical

    diagnosis

    refer

    replace

    system check

    throttle bore

    throttle plate

    engine speed

    diagnosis problem

    throttle check objects

    check objects blocking

    throttle bore excessive

    pintle excessive deposits

    excessive deposits throttle

    deposits throttle bore

    powertrain control module

    control module replacement

    module replacement programming

    powertrain board diagnostic

    using scan tool

    then monitoring engine

    monitoring engine speed

    engine speed scan

    tool engine speed

    engine speed remain

    speed remain specified

    remain specified value

    diagnosis problem found

    visually physically inspect

    physically inspect following

    found repair problem

    repair problem found

    check poor connection

    problem found replace

    found replace faulty

    replace faulty terminals

    faulty terminals necessary

    refer repair procedures