DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient

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    Circuit Description

    The PCM tests the EGR system during deceleration by momentarily commanding the EGR valve open while monitoring the Manifold Absolute Pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in...

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    Service Manual Table of Contents

    Document Tags

    Document Title: DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient

    system

    deceleration

    valve

    manifold

    sensor

    detected

    counter

    test

    samples

    flow

    repair

    following

    scan

    tool

    clear

    operating

    speed

    position

    greater

    vehicle

    indicate

    diagnostic

    records

    aids

    condition

    check

    harness

    inspect

    display

    exhaust

    problem

    found

    pipes

    flow test

    display scan tool

    powertrain board diagnostic

    necessary problem found