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Home >> Daewoo >> 2000 >> Lanos SE, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Symptom Diagnosis >> Idle Air Control System Check >> Test Description
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Test Description

The number(s) below refer to step(s) on diagnostic table.

  1. 2. The IAC valve is extended and retracted by IAC driver. IAC valve movement is verified by an engine speed change. If no change in engine speed occurs, valve can be removed from throttle body and tested. Connect IAC driver to removed IAC valve and turn ignition ON. Do not start engine.
  2. 5. This step checks quality of IAC valve movement in step 2. Fully extending IAC valve may cause an engine stall. This may be normal.
  3. 6. Steps 2 and 5 verify proper IAC valve operation. This step checks IAC circuit for a wiring or PCM/ ECM fault.
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