volvo Workshop Repair Guides

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Idle Speed/Throttle Actuator - Electronic: Description and Operation
Idle Air Control Valve - Engine Braking

IDLE AIR CONTROL VALVE - ENGINE BRAKING

During engine braking and at Closed Throttle Position (CTP), the Engine Control Module (ECM) controls the Idle Air Control (IAC) Valve so that
air is supplied to the engine to:

^ maintain the negative pressure in the inlet manifold within bounds
^ improve combustion and reduce emissions
^ control engine braking and how fast engine speed can drop.

Powertrain Management > Fuel Delivery and Air Induction > Idle Speed/Throttle Actuator - Electronic > Component Information > Description and Operation > Overview > Page 4001

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