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Idle/Throttle Speed Control Unit: Description and Operation

This sensor is used to maintain engine idle RPM at a pre-set value programmed in the ECU. To accomplish this, actual idle speed is compared to the
pre-set value. When idle speed exceeds these parameters, the ISC motor mounted on the intake manifold functions as a throttle bypass and adjusts intake
air quantity. 

Powertrain Management > Fuel Delivery and Air Induction > Idle/Throttle Speed Control Unit > Component Information > Description and Operation

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