Idle Speed Control Check

Circuit Description

The Idle Speed Control Check verifies proper IAC valve operation.

Diagnostic Aids

Reviewing the Failure Rec. may help diagnose an intermittent failure by showing how long ago and under what conditions a DTC has set.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

3. This check test the IAC valve to make sure that it is moving in and out without binding. When the IAC valve is commanded the PCM adjusts the IAC position and spark advance for a desired RPM.