Audi A3 1997 Manual page 46

Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
Notes on display zone 1:
In the event of a faulty display, also check encoding of the operating and display unit -E87.
Display zone
▪ Footwell vent temperature sender -G192.
2
Measured value of sensor in °C(check=> Electrical test, Page
Operating and display unit -E87 with two displays
3
▪ Dash panel temperature sensor -G56.
Measured value of sensor in °C(check=> Electrical test, Page
Operating and display unit -E87 with one display
▪ Temperature sensor dash panel -G56 (installed in -E87).
Check temperature in front of the intake grille installed into -E87.
▪ Refrigerant temperature supplied from dash panel insert in °C
4
Auxiliary variable for control of fresh air blower speed.
Shut-off criterion exists for compressor if refrigerant temperature too high (check=> Electrical
check, Page
Note on display zones 2 and 3:
The measured value from a defective temperature sensor is suppressed by -E87, and -E87 then uses an internal
calculated value for the further control (the current measured value is displayed).
Notes on display zone 4:
◆ The signal is used by -E87 for control calculation starting at a refrigerant temperature of + 40 °C.
◆ In the absence of a signal, -53 °C (+ 125 °C only for software version D71) is displayed as the refrigerant
temperature, and the refrigerant temperature is calculated by -E87.
◆ If the refrigerant temperature from the dash panel insert is too high, the dash panel insert switches its output
to earth and 121 °C is displayed as refrigerant temperature and the compressor is switched off.
◆ The "refrigerant temperature" wiring from -E87 to the dash panel insert does not exist in all model year 1997
and 1998 vehicles.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
◆ For vehicles without "refrigerant temperature" wiring between -E87 and the dash panel insert, compressor
shutoff in the event of excessively high refrigerant temperature is actuated by refrigerant temperature switch
-F14.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
◆ For vehicles with pressure switch -F129 with "refrigerant temperature" wiring between -E87 and dash panel
insert, compressor shutoff in the event of excessively high refrigerant temperature is controlled by refrigerant
temperature switch -F14 or by the dash panel insert.
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
Display group 008:
Voltage at fresh-air blower -V2, side lights, voltage at terminal 58d and 58s
Display zone
▪ Specified voltage for fresh air blower -V2 (calculated by -E87).
1
0 V to 12.5 V (depending on the -E87 setting).
▪ Actual voltage at fresh air blower -V2.
2
Deviation from the specified voltage (in the vehicle voltage range) less than 0.7 V.
40
01 - Self-diagnosis, Electrical check
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with respect to the correctness of information in this document. Copyright by AUDI AG.
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