Control of idle air

Fig 1: Identifying Engine Management System

Courtesy of VOLVO CARS OF NORTH AMERICA.

1	Engine control module (ECM)	5	Throttle position sensor (TPS)
2	Valve for idle RPM	6	ECC control panel
3	Engine speed (RPM) sensor	7	A/C pressure sensor
4	Engine coolant temperature (ECT) sensor	8	Transmission control module (TCM)

Function

Valve defective

If there should be a problem with a valve, the EVAP-valve opens to let in air to the engine through the canister.