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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Control System Self-Diagnostics - 3.1L Engine) >> Diagnostic Tests >> DTC P0506: Idle Speed - Low >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 5

    This test determines the ability of the engine controller and IAC valve circuits to control the IAC valve.

  2. 7

    This test determines the ability of the PCM to provide the IAC 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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