Controlled Idle Speed Check
- Ensure no DTCs are present, IAC system is okay, and ignition timing is correct. Block drive wheels. Apply parking brake. Connect scan tool to Data Link Connector (DLC). Put scan tool into OPEN mode.
- Start engine and allow it to reach normal operating temperature. Check for correct state of transmission range switch on scan tool. 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, see appropriate
TROUBLE SHOOTING - NO CODES article.
CONTROLLED IDLE SPEED & IAC COUNT
| Application |
Idle RPM |
IAC Counts |
| 2.2L |
|
5-60 |
| 3.4L |
Varies |
Varies |
| 4.3L |
650 |
18 |
| 4.8L, 5.3L & 6.0L |
|
Varies |
| 5.0L & 5.7L |
650 |
48 |
| 7.4L |
650 |
60 |