Controlled Idle Speed

There should be no Diagnostic Trouble Code (DTC)(s) displayed, idle air control system has been checked, and ignition timing correct.

1. Set parking brake and block drive wheels.
2. Connect a Tech 1 scan tool to the Data Link Connector (DLC) with tool in open mode.
3. Start engine and bring it to normal operating temperature.
4. Check for correct state of PRNDL (R-D-L) position on Tech 1 scan tool.
5. Check specifications chart for controlled idle speed and Idle Air Control (IAC) valve pintle position (counts).
6. If within specifications, the idle speed is being correctly controlled by the control module.
7. If not within specifications, refer to Diagnosis by Symptoms. Testing and Inspection