Audi A3 1997 Manual page 61

Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (200 ω)
- Adapter cable V.A.G 1598/12 connected
Test step V.A.G 1598
socket
4.4
and
12
4.5
and
13
4.6
and
11
Test step 5
Pressure switch -F129 / signal from radiator fan control unit -J293, "AC compressor cut-in" output, "engine
temperature too high" signal and temperature sensor blower -V42
Notes:
◆ High-pressure sensor -G65 will gradually replace air conditioner pressure switch -F129 (as of model year
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
1999, initially vehicles with 1.6 l engines).
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
◆ Test step 5.1 must be implemented only for vehicles with pressure switch -F129.
◆ Test steps 5.2 to 5.5 are identical for vehicles with pressure switch -F129 and high-pressure sensor -G65.
◆ Test step 5.6 must be implemented only for vehicles with high-pressure sensor -G65.
Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (200 ω)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
5.1 2
and
42
Notes:
◆ Test step 5.1 must be implemented only for vehicles with pressure switch -F129.
◆ If code 1 "pressure switch -F129 open" is displayed in measured value block 1 as a compressor shutoff
criterion:
- Also use current flow diagram to check the wiring to -F129 for a loose contact.
- Check the actuation of the radiator fan -V7 speed 1 (=>Final control diagnosis, Page
- Check AC pressure switch -F129 (switch between contacts 3 and 4, actuation of radiator fan
-V7 speed 2) (=>Page
Testing of
4 Central flap position‐
ing motor -V70
5 Air flow flap position‐
ing motor -V71
3 Footwell/defroster
flap positioning mo‐
tor -V85
Testing of
Air conditioner pres‐
sure switch -F129
(switch between the
contacts 1 and 2)
135 ).
Heating, Air Conditioner - Edition 06.2000
▪ Test conditions
- Additional opera‐
tions
▪ Test conditions
- Additional opera‐
tions
▪ Ignition off.
10.3 - Test in vehicles with an operating and display unit with two displays
Audi A3 1997 ➤
Specified value Remedies if specified
value not attained
- 20 ωto 100ω. - Use current flow di‐
agram to locate and
eliminate open circuit,
contact resistance or
short circuit
- 20 ωto 100ω. - Replace positioning
motor
- 20 ωto 100ω.
Specified value Remedies if specified
value not attained
- Less than 20 ω - Use current flow dia‐
gram to locate and
eliminate open circuit
or contact resistance.
Check pressure switch
-F129 (=>Seite
18 ).
135 ).
55