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Home >> Chevrolet >> 2003 >> Chevy Express H2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Control System & Component Tests - 4.3L) >> Idle Control System >> Idle Air Control System Diagnosis >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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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