- Warm engine to normal operating temperature. Turn A/C and all accessories off. Enter diagnostics by pushing the "OFF" and "WARMER" buttons on the climate control panel. Check for any trouble codes. See appropriate SELF-DIAGNOSTICS article in this section for trouble code definitions and diagnostics.
- Check and adjust engine timing. Cooling fan must not be running during adjustments. Place steering wheel in straight ahead position and transmission selector in Park. Select ECM "ISC MOTOR" override E.S.3. Retract ISC by pressing the "COOLER" button on climate control panel. Wait a minimum of 20 seconds for ISC plunger to retract.
- ISC plunger should now be retracted. If plunger still contacts throttle lever, turn plunger in, so it is not touching. With ISC plunger fully retracted and not touching throttle lever, check minimum idle speed RPM. See «MINIMUM IDLE SPEED»(ref-10116-S38751948912000110900000) table. If idle speed is incorrect, adjust idle speed stop screw. Proceed to THROTTLE POSITION SENSOR (TPS) in this article to check and adjust TPS if necessary. Once TPS is adjusted, perform «MAXIMUM ISC EXTENSION (ELDORADO & SEVILLE)»(ref-10116-S09596596512000110900000) in this article.
| Application | Idle Speed (RPM) |
|---|---|
| Deville, Eldorado, Fleetwood & Seville | 500-550 |
MINIMUM IDLE SPEED