Idle Speed Control

The idle speed control system is operated by vacuum signals and the MCU. The idle speed system raises and/or maintains the engine idle whenever high loads are present. The idle speed control system consists of a sole-vac (throttle positioner), an idle vacuum switching solenoid, and an idle speed relay.

The sole-vac actuator is activated if the headlamps or accessories, such as air conditioning or rear window defogger, are in operation. It is also activated during vehicle deceleration.