Idle Speed/Throttle Actuator - Electronic: Service and Repair
IDLE AIR CONTROL (IAC) VALVEREMOVAL
1. Ignition Off.
2. Disconnect IAC valve harness connector.
3. Remove IAC valve attachment screws and remove IAC valve.
NOTE:
^ The IAC valve is an electrical component and must NOT be soaked in any liquid solvent; otherwise damage could result.
^ Do not unnecessarily push or pull on the pintle valve. The force required moving the pintle of an in-service IAC valve may damage the threads on the worm drive.
4. Clean IAC valve O-ring sealing surface, pintle valve seat and air passage in the throttle body.
^ If the IAC valve is going to be reused, the IAC valve may be cleaned using a shop towel or cleaning solvent to remove heavy carbon deposits. DO NOT submerge IAC valve in solvent.
^ If the IAC valve O-ring is going to be reused, make sure it is free from cuts, cracks or distortion.
^ Shiny spots on the pintle or seat are normal and do not indicate misalignment or a bent pintle shaft.
^ Whenever the IAC valve throttle body air passage contains heavy deposits, remove throttle body assembly for complete cleaning.
IAC MEASUREMENT PROCEDURE
The following measurement procedure should only be performed if installing a new IAC valve.
IMPORTANT: Only replace an old IAC valve with an identical part. The IAC valve pintle and shape are designed for specific applications.
1. Measure distance between tip of IAC valve and IAC valve mounting flange as shown in illustration.
2. If measurement is greater than 28 mm (1.10 in), use finger pressure to slowly retract pintle until the distance becomes at least less than 20 mm (0.79 in). The force required retracting the pintle of a new IAC valve will not damage the worm drive.
INSTALLATION
1. Lubricate IAC valve O-ring with clean engine oil.
2. Install IAC valve with O-ring by installing assembly slightly counterclockwise from attachment screw holes.
3. Twist assembly clockwise until IAC valve is seated properly and aligned with attachment screw holes.
4. Install IAC valve attachment screws.
Torque:
IAC Valve Screws: 3 N.m (27 in-lbs)
5. Connect IAC valve harness connector. Push in connector until a click is heard, then pull back to confirm a positive engagement.
6. Perform the following procedure, which will allow the PCM to relearn the IAC valve position.
6.1 Turn ignition On with engine Off for 10 seconds; then turn ignition Off for 10 seconds.
6.2 Start engine and let idle for 30 seconds.
6.3 Accelerate engine slowly between idle and 3500 rpm five times.
6.4 Let engine return to idle. IAC valve position should be relearned.