Idle Speed/Throttle Actuator - Electronic: Service and Repair

IAC Valve Replacement

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.




1. Disconnect the negative battery cable.
2. Remove the engine cover.
3. Disconnect the IAC valve harness connector.




4. Remove the IAC mounting bolts.

NOTE: If the IAC valve has 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 the IAC valve in any liquid cleaner or solvent, as damage may result.




5. Remove the IAC valve from the throttle body assembly.
6. Remove the O-ring.

CLEANING AND INSPECTION PROCEDURE




1. Clean the IAC valve O-ring sealing surface, pintle valve seat, and air passage.
^ Remove excess carbon deposits with a small amount of carburetor cleaner on a parts cleaning brush. Follow any instructions on the cleaner container regarding cleaner usage.
^ Do not use a solvent containing an extremely powerful solvent such as methyl ethyl ketone.
^ Shiny spots on the pintle and seat do not represent a bent or misaligned pintle shaft.
^ If heavy deposits are present in the air passage, then remove the throttle body for a complete cleaning. Refer to Throttle Body Assembly Replacement.
2. Inspect the IAC valve O-ring for cuts, cracks, or distortion.
3. Replace O-ring if damaged.

INSTALLATION PROCEDURE

IMPORTANT: Use an identical part when installing a new IAC valve. The IAC valve pintle shape and dimensions are designed for specific applications.

1. Measure the distance between the IAC valve pintle and mounting flange. Use finger pressure to slowly retract the pintle if the distance is greater than 28 mm.




2. Lubricate the IAC valve O-ring with clean engine oil.
3. Align the flange holes with the mounting holes on the throttle body assembly.
4. Insert the IAC valve through the O-ring into the throttle body assembly.

NOTE: Refer to Fastener Notice in Service Precautions.




5. Install the IAC valve mounting bolts.

Tighten
Tighten the bolts to 3 N.m (26 lb in).




6. Connect the IAC valve harness connector.
7. Install engine cover.
8. Connect the negative battery cable.
9. Perform the following steps to reset the IAC valve pintle position:

WITHOUT SCAN TOOL
9.1. Turn ON the ignition for 5 seconds.
9.2. Turn OFF the ignition for 10 seconds.
9.3. Start the engine.
9.4. Check for the proper idle speed.

WITH SCAN TOOL
9.1. Connect the scan tool to the DLC.
9.2. Turn ON the ignition leaving the engine OFF.
9.3. Using the scan tool, select IAC Reset in Special Functions.
9.4. Activate the reset function and wait for the IAC counter to stop.
9.5. Start the engine.
9.6. Check for proper idle speed.