Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESMEASURING VALUE BLOCKS (FUNCTION 08)EVALUATING MEASURED VALUE BLOCKS
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Evaluating Measured Value Blocks
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Evaluating Measured Value Blocks
Overview of display group numbers which can be selected
NOTE: With the introduction of sensor for air quality -G238-, A/C control head -E87- was changed (Part No. beginning with index "J"). In display group 001, display field 4 of the measuring value block now shows why the A/C is operating in recirculation mode or why it remains in fresh air mode, although the air quality sensor requires the recirculation mode.
Display Group 001 - 006:
Display Group 007 - 015:
Display group 001 - A/C compressor cut-off conditions, voltage for A/C clutch -N25-, voltage to terminal 15 and requirement for recirculating air mode/sensor for air quality -G238-
Display Field 1, Code 0 - 1:
Display Field 1, Code 2 - 4:
Display Field 1, Code 5:
Display Field 1, Code 6 - 11:
Display Field 1 - 3, Code 12 - 14:
Display Field 4, Code 00 - 11:
Display Field 4, Code 12 - 13:
Display Field 4, Code 20 - 60:
Display group 002-Defroster flap motor -V107-
Display group 003-Left center vent motor -V110-
Display group 004-Right center vent motor -V111-
Display group 005-Center vent adjusting motor -V102-
Display group 006-Temperature regulator flap motor -V68-
Display group 007-Left footwell flap motor -V108-
Display group 008-Right footwell flap motor -V109-
Display group 009-Rear footwell vent motor -V112-
Display group 010-Air flow flap motor -V71-
Display group 011-Recirculation flap motor -V113-
Display group 012-ACF flap motor -V114-
Display group 013-Left center air vent switch -F183- and right center vent switch -F184-, center vent position sensor -G142- and calculated ambient temperature for outside air temperature display -G106-
Display group 014-Outside air temperature sensor -G17- and fresh air intake duct temperature sensor -G89-, left vent temperature sensor -G150- and right vent temperature sensor -G151-
Display group 015-Instrument panel interior temperature sensor -G56-, calculated coolant temperature and sunlight photo sensor -G107-
Display group 016-Voltage and fresh air blower -V2-, parking light and voltage at terminal 58D)
Display group 017-Engine speed, compressor speed and vehicle speed
Display group 018-Kick-down switch, coolant temperature switch, A/C compressor cut-in and A/C refrigerant high pressure switch -F118-
Display group 019-Coolant pump -V50-, left heat regulating valve -N175- and right heat regulating valve -N176-
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.