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Idle Air Control (IAC) Valve

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  1. Disconnect harness connector to motor. Check resistance across IAC coil terminals "A" to "B" and "C" to "D". See Fig 1 . Resistance should be 40-80 ohms. If okay, go to next step. If resistance is not as specified, replace IAC valve.
  2. Check resistance between IAC terminals "B" to "C" and "A" to "D". Resistance should be infinite. If resistance is not as specified, replace IAC valve.
NOTE: Functional testing of Idle Air Control (IAC) valve requires a bidirectional scan tool capable of cycling PCM/VCM output devices or a special IAC Driver and Noid Light Set (222L or J-37027). Text in TESTS W/CODES articles may refer to Tech 1 tester, General Motors' bidirectional scan tool.
Fig 1: Identifying IAC Valve Circuits (Typical)
G95D27709Courtesy of GENERAL MOTORS CORP.
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