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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 401 (Engine Controls - Self Diagnostics - 8.1L) >> Diagnostic Tests >> DTC P0506: Idle Control System - Rpm Low & DTC P0507: Idle Control System - Rpm High >> Test Description

Test Description

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

  1. 2

    This test determines if the engine can achieve the commanded RPM. If the engine does not reach the commanded RPM, the test determines whether the RPM is too high or too low.
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