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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 133 (Engine Controls Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P0506: Idle Control System - Low Rpm >> Test Description

Test Description

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

The number below refers to the step number in the diagnostic procedures.

  1. 5

    This test will determine the ability of the PCM and IAC valve circuits to control the IAC valve.

  2. 7

    This test will determine the ability of the PCM to provide the IAC valve control circuits with a ground. On a normal operating system, the test light should not flash while the IAC counts are incrementing.

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