Idle Speed Control (ISC) Motor

Motor controls pintle-type air valve (DOHC engines) or throttle plate angle (SOHC engines) to regulate volume of intake air at idle.

During start mode, ECU controls idle intake air volume according to coolant temperature input. After starting, with idle position switch activated (throttle closed), fast idle speed is controlled by ISC motor and fast idle air control valve (if equipped).

When idle switch is deactivated (throttle open), ISC motor moves to a preset position in accordance with coolant temperature input.

ECU signals ISC motor to increase engine RPM in the following situations: A/T (if applicable) is shifted from Neutral to Drive, A/C is turned on, or power steering pressure reaches a preset value.