Audi A3 1997 Manual page 64

Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
- indicates to operating and display unit -E87 that the refrigerant circuit pressure is OK and the compressor
can be switched on (via magnetic clutch -N25).
- switches radiator fan to 2nd speed if pressure increases.
◆ High-pressure sensor -G65 will gradually replace air conditioner pressure switch -F129 (as of model year
1999, initially vehicles with 1.6 l engines).
◆ If code 1 "pressure switch -F129 open" is displayed in measured value block 1 as a compressor shutoff
criterion:
- Use current flow diagram to check the wiring to -G65 for a loose contact.
- Use current flow diagram to check wiring between control unit -J293 and -E87 for loose contact.
- Check the actuation of the radiator fan -V7 speed 1 (=>Final control diagnosis, Page
- Check signal from high-pressure sensor -G65 =>Page
Test step 6
Radiator fan actuation -V7, magnetic clutch actuation -N25
Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A =)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
6.1 14
and
42
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58
01 - Self-diagnosis, Electrical check
Testing of ▪ Test conditions
- Additional opera‐
tions
Actuation of radia‐ ▪ Engine running - Less than 1 A
tor fan -V7
85 .
Specified value
Radiator fan -V7
running at speed 1
(observe relevant
notes)
18 ).
Remedies if specified
value not attained
- Use current flow dia‐
gram to locate and
eliminate open circuit
or short to positive or
earth in the wiring be‐
tween -J293 and -E87.
Check actuation of
control unit -J293
(=>Page 70 ).
Control unit -J293 de‐
fective - replace.
(cont.)
▼