Climate control recirculation (automatic mode) not working

Make: Alfa Romeo
Model: Brera and Spider Factory Service Manual
Year: 2005–2010
Section: Climate control › Climate control recirculation (automatic mode) not working

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Fault diagnosisClimate control recirculation (automatic mode) not working

CLIMATE CONTROL RECIRCULATION (AUTOMATIC MODE) NOT WORKING

Automatic climate control

For vehicles with AQS sensors only, the recirculation is not closed automatically if there is pollution (CO, NO2 toxic gases only)

1	CHECK ON CORRECT OPERATION OF CLIMATE CONTROL NODE	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the engine started, set the climate control system control unit to the AUTO position, adjust the temperature knob to reach 22°C, set the fan speed at 6 bars, then press the recirculation button (check that the recirculation warning light comes on). Then check that the air flow varies during the opening/closing of the flap by feeling. Also locate the grille in the engine compartment for the air intake casing and check the air intake when switching from recirculation to outside air intake. "When the control unit is set to the FULL AUTO function and the outside temperature is below 3°C the air intake flap opens automatically to prevent the windscreen from misting up". Note:" The AQS sensor is disabled at outside temperatures below 8°C".	Move on to Step 2	1.The LED with the recirculation symbol does not light up	1. Move on to Step 4
		Move on to Step 2	2. The recirculation symbol LED comes on (but the recirculation does not operate).	2. Move on to Step 2
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment and check: that there are no errors at the air recirculation actuator; that there are no faults in the AQS sensor.	Move on to Step 3	1. Short circuit to earth error.	1. Move on to Step 5
			2. Short circuit to +12V error.	2. Move on to Step 5
			3. Mechanical interference/stuck error.	3. Move on to Step 7
			4. Errors in the AQS sensor	4. Move on to Step 4
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keeping the Examiner diagnostic equipment connected, check the correct operation of the air recirculation through active diagnosis	Move on to Step 4	Air recirculation actuator not working	Move on to Step 5
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the recirculation flap is working properly in automatic mode by carrying out the "Pollution sensor test". If the result is negative, carry out the See Test 5040DD Check operation of pollution sensor (AQS)	End of diagnosis	1.AQS sensor not working	1.Replace AQS sensor Op. 5010D72 AIR QUALITY SENSOR - R.R. FOLLOWING ELECTRICAL CIRCUIT CHECK
		End of diagnosis	2. Wiring faulty.	2. Repair the wiring
5	CHECK ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check whether the electrical wiring connections are loose. Remove the control unit from the panel mount, disconnect the wiring connector from the control unit and check visually for any damage to the connector and reconnect correctly to check for false contacts. Remove the oddments pocket and disconnect the connector, inspecting visually for any damage to it and reconnect the electrical connector to the actuator.	Move on to Step 6	Electrical wiring connections loose or damaged.	Restore the correct wiring connections.
6	CHECK ON CORRECT OPERATION OF RECIRCULATION ACTUATOR	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Then proceed as follows: with the engine running, switch on the recirculation air intake function manually with the fan at the maximum speed. If the actuator works and the flap is driven, check whether the air flow rate varies during the movement by feeling it. Deactivate the function restoring the actuator to the original condition. Identify the air intake casing grille on the vehicle and check the air intake in the shift from recirculation to outside air and the other way round by feeling with your hand.	Move on to Step 7	Incorrect operation of recirculation actuator.	Replace the recirculation actuator Op. 5040D75 AIR CONDITIONING RECIRCULATION FLAP CONTROL MOTOR - R.R
7	RECIRCULATION ACTUATOR FLAP CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Visually inspect that the air recirculation actuator flap completes its travel without any hinderance.	End of diagnosis	1. Flap travel incomplete.	1.Free from air recirculation actuator flap from the impediment.
			2. Flap damaged.	2.Replace the flap.
			3. Kinematic mechanism damaged.	3.Repair kinematic mechanism.

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Parts & tools for this job For 2005 Alfa Romeo Brera

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