Idle Up Control Valve: Testing and Inspection

An air valve solenoid, mounted on the front of the air flow meter, allows extra air to bypass the throttle plate and increase the idle speed.
1. With the engine at normal operating temperature, turn on the A/C.
2. Check the compressor clutch to verify engagement.
3. Pinch closed one of the hoses going to the air valve. Rpm should drop.
4. If not:
a. Check for voltage at the air bypass valve plug.
b. Check resistance between terminals of air bypass valve. Resistance should be about 24 ohms.
c. Check hoses for obstructions, or leaks. Replace any defective hoses.
5. If voltage is not present, repair wiring.
6. If resistance is not correct, replace the air bypass valve.