Idle Speed/Throttle Actuator - Electronic: Adjustments

Idle Speed Adjusting Screw:

RH Rear Of Engine Compartment:

Idle Speed Settings:

IDLE SPEED / IAC DUTY (ISC DUTY) ADJUSTMENT

IMPORTANT: Before starting engine place manual selector in "P" (automatic transmission) or place gearshift control lever in neutral (manual transmission) and set parking brake and block drive wheels.

PROCEDURE
1. Check accelerator cable for free movement and excessive play; cable play should be within specification. Refer to Throttle Cable/Linkage under Fuel Delivery and Air Induction.
2. Inspect lead wires and hoses of the Throttle Body Fuel Injection (TBI) and Evaporative Emission (EVAP) control system for being connected securely.
3. Check ignition timing, and adjust if necessary. Refer to Ignition System / Adjustments.
4. Turn "OFF" all accessories (A/C, wipers, heater, lights, etc.).
5. Make sure air cleaner (ACL) is installed correctly.
6. Remove cover from idle speed adjusting screw.
7. Start engine and allow it to reach normal operating temperature (accessories "OFF").

ADJUST
1. Bring engine speed above 1,500 RPM once and let it slow down to idle speed.
2. Connect Tech 1 scan tool (note ENGINE SPEED and ISC ADJUST MONIT).
3. Connect a jumper from Diagnostic Request Terminal in the Duty Check Data Link Connector (DLC) to ground.
4. Check idle speed and IAC duty (ISC duty). IAC duty (ISC duty) should read 50% with correct engine idle speed.
5. Adjust idle speed and/or IAC duty (ISC duty) as necessary. Correct idle speed and/or IAC duty (ISC duty) by turning idle speed adjusting screw "IN" to increase or "OUT" to decrease.
6. Turn A/C switch and blower speed selector switch "ON." Check that the specified idle speed is obtained. If not, check A/C idle-up circuit or IAC valve.
7. Remove jumper from duty check DLC.
8. Disconnect Tech 1 scan tool.
9. Install idle speed adjusting screw cover.