Audi A3 1997 Manual page 19

Vehicles with high-pressure sensor -G65
V.A.G 1551 printer
00792 3224
Air conditioner pressure switch -
F129
* Short to earth /SP
(cont.)
▼
V.A.G 1551 printer
(cont.) - Open circuit in the power supply or in the
earth connection to high-pressure sensor -
G65.
Short circuit in the wiring between -G65, -
J293 and the engine control unit
- Actuation of radiator fan -V7 (speed 1) de‐
fective.
Condenser or radiator dirty.
Actuation of radiator fan -V7 (speed 2) by
radiator fan control unit -J293 defective
(cont.)
▼
V.A.G 1551 printer
(cont.) - High-pressure sensor -G65 defective.
Radiator fan control unit -J293 defective.
Fault in refrigerant circuit (overpressure or
vacuum).
Notes:
◆ High-pressure sensor -G65 will gradually replace air conditioner pressure switch -F129 (as of model year
1999, initially vehicles with 1.6 l engines). As of model year 2001 only high-pressure switches -G65 are
installed.
◆ Radiator fan control unit -J293 versions and vehicle wiring differ for vehicles with pressure switch -F129 and
high-pressure sensor -G65.
=> Parts List
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
◆ The high-pressure sensor -G65 generates a square wave-signal whose duty cycle changes in line with the
refrigerant circuit pressure =>Page
◆ Depending on high-pressure sensor -G65 signal, radiator fan control unit -J293:
- indicates to operating and display unit -E87 that the refrigerant circuit pressure is OK and the compressor
can be switched on (magnetic clutch -N25 via control unit -J293).
- switches radiator fan to 2nd speed if pressure increases.
◆ The signal generated by high-pressure sensor -G65 is also used for engine control (the required compressor
drive torque is governed by the refrigerant circuit pressure). Depending on the engine control unit version,
Heating, Air Conditioner - Edition 06.2000
Possible causes of fault
- Open circuit in the wiring between
radiator fan control unit -J293 and -
E87.
Open circuit in the wiring between
High-pressure sensor -G65 and
control unit -J293.
Possible causes of fault
Possible causes of fault
85
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Audi A3 1997 ➤
Fault remedy
- Use current flow diagram to locate
and eliminate open circuit or loose
contact.
=> Current Flow Diagrams, Electrical
Fault-Finding and Fitting Locations
Fault remedy
- Use current flow diagram to locate and elim‐
inate open circuit or loose contact.
=> Current Flow Diagrams, Electrical Fault-
Finding and Fitting Locations
Use current flow diagram to locate and elim‐
inate short circuit
- Check the actuation of the fan -V7 (speed
1) =>Final control diagnosis, Page
Fault remedy
- Check signal from high-pressure sensor -
G65 (=>Page 76 ).
Send vehicle to a specialist VW/Audi air-con‐
ditioning service centre.
46 ).
13
4.1 - Fault table