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Home >> Suzuki >> 2004 >> Forenza S, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine General Information & Diagnosis >> Diagnostic Information and Procedures >> Idle Air Control System Check >> Test Description
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Test Description

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

  1. (2) The IAC valve is extended and retracted by the IAC driver. IAC valve movement is verified by an engine speed change. If no change in engine speed occurs, the valve can be removed from the throttle body and tested. Connect the IAC driver to the removed IAC valve and turn the ignition ON. Do not start the engine.
  2. (5) This step checks the quality of the IAC valve movement in Step 2. Fully extending the 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 the IAC circuit for a wiring or ECM fault.
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