Toyota 22270-74290 Valve Assembly, Idle Speed Control

1. Detach the cable from the negative terminal of the battery. (Caution: If the stereo has an anti-theft system, refer to the manual before detaching the cable.) 2. Drain the radiator. 3. Loosen the hose clamps and remove the air intake duct. 4. Detach the accelerator cable from the throttle lever arm, then detach the throttle cable bracket and set it aside. 5. If equipped with an automatic transaxle, detach the throttle valve (TV) cable from the throttle linkage and set the cable and brackets aside. 6. Clearly label and detach all vacuum and coolant hoses from the throttle body. 7. Unplug the electrical connector from the throttle position sensor. 8. Remove the throttle body mounting bolts and detach the throttle body and gasket from the air intake chamber. 9. Clean the throttle body casting with a soft brush and carburetor cleaner, then blow out all passages with compressed air. (Caution: Do not clean the throttle position sensor with anything.) 10. Installation of the throttle body is the reverse of removal. Be sure to tighten the throttle body mounting bolts to the specified torque.

The engine idle speed is controlled by the Idle Air Control (IAC) valve.