Controlled Idle Speed Check
- Ensure no trouble code(s) are present, IAC system is okay, and ignition timing is correct. Block drive wheels. Apply parking brake. Connect Tech 1 scan tester to Data Link Connector (DLC). Put scan tester into OPEN mode.
- Start engine and bring to normal operating temperature. Check for correct state of park/neutral switch on scan tester. Check if idle speed and IAC valve pintle position (counts) are as specified. See CONTROLLED IDLE SPEED & IAC COUNT table.
- If idle speed is not within specification, refer to TESTS W/O CODES
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CONTROLLED IDLE SPEED & IAC COUNT
| Application |
Idle RPM |
IAC Counts |
| 4.3L CSI |
| AWD |
625 |
5-30 |
| 2WD |
550 |
5-30 |