W20 POLLUTANT EMISSIONS IN VEHICLE - Alfa - 159 - eLearn

Pollutant emissions enter the vehicle during automatic operation (failed automatic operation of the recirculation flaps)

Only for vehicles equipped with AQS.

1	RECIRCULATION MOTOR ELECTRICAL CIRCUIT CHECK	All OK	Problems encountered	Operation

	Check the operation of:- air recirculation motor;- connection between air motor and climate control system control unit: See E6020 AIR CONDITIONING - control on climate control system control unit.	Move on to Step 2	Recirculation motor defective	Replace the recirculation motor Op. 5040D75 AIR CONDITIONING RECIRCULATION FLAP CONTROL MOTOR - R.R
			Connections between recirculation motor and control unit not correct.	Restore the correct connection See E6020 AIR CONDITIONING
			Control on control unit defective.	Replace the climate control system control unit Op. 5040D18 AIR CONDITIONING CONTROL UNIT - R.R.
2	POLLUTION SENSOR CHECK	All OK	Problems encountered	Operation
	Check that the pollution sensor is correctly supplied and working properly by carrying out the See Test 5040DD Check operation of pollution sensor (AQS)	End of diagnosis	AQS sensor not correctly supplied	Restore the correct power supply See E6020 AIR CONDITIONING
		End of diagnosis	AQS sensor not working properly.	Replace the AQS sensor Op. 5010D72 AIR QUALITY SENSOR - R.R. FOLLOWING ELECTRICAL CIRCUIT CHECK