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Home >> Cadillac >> 2003 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Engine Controls - System & Component Testing - 4.3) >> Idle Control System >> Idle Air Control System Diagnosis >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to step number in diagnostic procedure.

  1. 5  - This test will determine the ability of the PCM and IAC valve control circuits to control the IAC valve.
  2. 7  - This test will determine the ability of the PCM to provide the IAC control valve circuits with a ground. On a normally operating system, the test light should not flash while the IAC Counts are incrementing.

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