Q7 Quattro V6-3.6L (BHK) (2007)
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Climate Control Exhaust Gas Sensor: Testing and Inspection
Air Quality Sensor, Checking
Special tools and equipment
‹› Vehicle Diagnostic, Testing and Information System (VAS 5051 A) with diagnostic cable (VAS 5051/5A)
‹› Test gas (D 007 855 A2)
Test requirements:
‹› Vehicle is in area where there is clean recirculating air (not near running engines, openings from exhaust systems, etc.)
‹› Engine compartment and plenum chamber are clean (not contaminated with oil and/or fuel).
‹› The engine compartment and plenum chamber were not sprayed with cleaning or preservative solutions.
Checking
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With ignition switched off, connect Diagnostic Operation System (VAS 5051 A) with Diagnostic Cable - 3 Meter (VAS 5051/5A) to the 16-pin
Data Link Connector (DLC) of vehicle.
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Start engine.
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Check DTC memory of front A/C control head Climatronic Control Module (J255).
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Set operating mode "Auto" on front A/C control head Climatronic Control Module (J255).
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Switch on the "automatic air recirculation" function via the front A/C control head Climatronic Control Module (J255) (function is displayed on
screen of Multi Media Interface).
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Wait 30 seconds (warm up time for Air Quality Sensor (G238)).
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Select the associated display group (currently display group " 023") via the "Read measuring value block" function of diagnostic operation system
(VAS 5051 A).
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Read indications shown in display fields "3" and " 4".
‹› Display field "4" shows the operating condition of recirculating air flap and display field "3" shows the condition of the Air Quality Sensor (G238)
signal. Explanatory notes of possible displays.
‹› Specified value in display field "4" (no request for " recirculating air mode" present, A/C system in fresh air mode)
or
‹› Specified value in display field "4" "partial recirculating air mode", (fresh air and recirculating air flap in approximate center position)
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Place spray head - A - of test gas bottle over air inlet of air quality sensor - B -.
