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Idle Air Control (IAC) Valve: Turbo

  1. Warm engine to normal operating temperature. Ensure idle speed is correct. See ADJUSTMENTS article. Apply parking brake and place transaxle in Neutral.
  2. With engine idling, disconnect electrical connector from IAC valve located on lower area of throttle body. Engine RPM should increase to at least 1000 RPM. Reinstall electrical connector on IAC valve.
  3. Ensure engine returns to proper idle speed. If engine does not return to proper idle speed, check IAC valve resistance and operation.
  4. To check IAC valve resistance, ensure ignition is off. Disconnect electrical connector from IAC valve. Using ohmmeter, measure resistance between terminal B+ and each remaining terminal. See Figure. Replace IAC valve if resistance is not 19.3-22.3 ohms.
  5. To check IAC valve operation, remove IAC valve from throttle body. Connect battery voltage and ground to proper terminals and ensure valve opens and closes. See Figure and Figure. Replace IAC valve if defective.
  6. If IAC valve resistance is correct and operates correctly, check wiring circuit between Engine Control Module (ECM) and IAC valve. The ECM is located on driver's side rear corner of engine compartment. See appropriate wiring diagram in WIRING DIAGRAMS article.
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