- 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 article in COMPUTERIZED ENGINE CONTROLS section for trouble code definitions and diagnostics.
- Check and adjust engine timing. Cooling fan must not be running during adjustments. Place steering wheel in center position and transmission selector in Park. Using a jumper wire, ground the Green "test" connector near the alternator. The "NO CHARGE" light should come on.
- Select ECM override E.6.3 "ISC MOTOR". 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-92294-S38697243682001033000000) table. If idle speed is incorrect, adjust idle speed stop screw.
| Application | Idle Speed |
|---|---|
| 4.5L | 475-550 |
MINIMUM IDLE SPEED RPM