Idle Air Control Valve - Air Regulator Circuit

DESCRIPTION
The idle air control valve (IACV)-air regulator provides an air bypass when the engine is cold for a fast idle during warm-up. A bimetal, heater and rotary shutter are built into the IACV-air regulator. When the bimetal temperature is low, the air by-pass port opens. As the engine starts and electric current flows through a heater, the bimetal begins to turn the shutter to close the by-pass port. The air passage remains closed until the engine stops and the bimetal temperature drops.








DIAGNOSTIC PROCEDURE





WIRING DIAGRAM

COMPONENT INSPECTION
IACV-Air Regulator





Disconnect EFI (IACV-air regulator) sub-harness connector.
- Check IACV-air regulator resistance.
Resistance:
Approximately 70 - 80 ohms at 250°C (770°F)
- Check IACV-air regulator for clogging.