Controlled Idle Speed Check
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2000 Pontiac Montana, 2000 Oldsmobile Silhouette, 2000 Oldsmobile Bravada, 2000 GMC Yukon XL, and 2000 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.
- 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 | (1) | 5-60 | ||
| 3.4L | Varies | Varies | ||
| 4.3L | 650 | 18 | ||
| 4.8L, 5.3L & 6.0L | (1) | Varies | ||
| 5.0L & 5.7L | 650 | 48 | ||
| 7.4L | 650 | 60 | ||
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