Idle Speed Control

Wiring Diagram:

CIRCUIT DESCRIPTION

The Idle Speed Control Check verifies proper IAC valve operation.


TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table.

4. This check test the IAC valve to make sure that it is moving in and out without binding. Follow PCM DTC P1508 diagnosis to identify the cause of a faulty IAC valve.
5. This procedure checks for high minimum air idle which could cause a high idle at closed throttle. It is OK if the engine cannot stay running at minimum air idle.
7. This procedure checks for IAC ability to increase idle speed.