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Inspecting Idle Air Control Motor Operation

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION. For wiring diagram, see WIRING DIAGRAMS - 3.3L article in ENGINE PERFORMANCE. After each repair, perform TEST VER-1  .
  1. Disconnect Idle Air Control (IAC) motor connector. Turn ignition on. Using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on IAC motor connector terminal No. 1 (Gray/Red wire). If voltage is less than one volt, go to TEST NS-7B  . If voltage is more than one volt, go to next step.
  2. Check voltage on IAC motor connector terminal No. 3 (Brown/White wire). If voltage is less than one volt, go to TEST NS-7C  . If voltage is more than one volt, go to next step.
  3. Check voltage on IAC motor connector terminal No. 4 (Violet/Black wire). If voltage is less than one volt, go to TEST NS-7D. If voltage is more than one volt, go to next step.
  4. Check voltage on IAC motor connector terminal No. 2 (Yellow/Black wire). If voltage is less than one volt, go to TEST NS-7E  . If voltage is more than one volt, turn ignition off. Go to next step.
  5. Remove IAC motor from throttle body. Reconnect IAC motor connector. Using scan tool, actuate IAC motor connector. If IAC motor tip moves in and out, go to TEST NS-8A  . If IAC motor tip does not move in and out, replace IAC motor.
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