Idle Speed/Throttle Actuator - Electronic: Service and Repair

Idle Air / Vacuum Signal Housing:

REMOVE
^ Negative Battery terminal.
^ Electrical connector.
^ Idle Air Control (IAC) valve attaching screws.
^ IAC valve assembly.

CAUTION:
On IAC valves that have been in service: Do Not push or pull on the IAC valve pintle. The force required to move the pintle may damage the threads on the worm drive. Also, Do Not soak IAC valve in any liquid cleaner or solvent, as damage may result.


CLEANING AND INSPECTION
Clean IAC Valve O-Ring Sealing Surface, Pintle Valve Seat And Air Passage.

^ Use carburetor cleaner and a parts cleaning brush to remove carbon deposits. Do Not use a cleaner that contains methyl ethyl ketone, an extremely strong solvent, and not necessary for this type of deposit.

^ Shiny spots on the pintle or seat are normal, and do not indicate misalignment or a bent pintle shaft.

^ If air passage has heavy deposits, remove throttle body for complete cleaning.

^ Inspect IAC valve O-Ring for cuts, cracks or distortion. Replace if damaged.


NOTICE: If installing a new IAC valve, be sure to replace with an identical part. IAC valve pintle shape and diameter are designed for the specific application.

Idle Air Control (IAC) Valve:

MEASURE
If Installing a new IAC Valve measure the distance between tip of IAC valve pintle and mounting flange. If greater than 28 mm, use finger pressure to slowly retract the pintle. The force required to retract the pintle of a new valve will not cause damage to the valve.



INSTALL
^ Lubricate IAC valve O-Ring with engine oil.
^ IAC valve assembly.
^ Attaching screws.

Tighten
IAC valve attaching screws to 3.4 Nm (30 lb in)

^ Electrical connector.
^ Negative battery terminal.

IDLE LEARN PROCEDURE
Any time the battery is disconnected, the programmed position of the Idle Air Control (IAC) valve pintle is lost, and replaced with a "default" value. To return the IAC valve pintle to the correct position, the Idle Learn Procedure must be performed. Refer to Adjustments.