Audi A3 1997 Manual page 79

Test step 2 (actuation of radiator fan)
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
2.1 Connector
A contact 5
and
connector
A, contact 6
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
2.2 Connector
A contact 2
and
connector
A, contact 6
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
2.3 Connector
A
and
connector
B attached
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
"Fan ON" signal ▪ Engine running
from -E87 (1st Operating and dis‐
speed from -E87). play unit -E87 in "au‐
to" mode (compres‐
sor on)
Testing of ▪ Test conditions
- Additional opera‐
tions
"Fan ON" signal ▪ Connector re‐
from -E87 (2nd moved from pres‐
speed from pres‐ sure switch -F129,
sure switch -F129). and contacts 3 and 4
jumpered
▪ Ignition on.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
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.
Testing of ▪ Test conditions
- Additional opera‐
tions
Actuation of fan -V7 ▪ Ignition on.
(speed 2) from pres‐ ▪ Connector de‐
sure switch -F129. tached from pres‐
sure switch -F129.
Contacts 3 and 4
jumpered (at con‐
nector to -F129).
11.2 - Electrical check at control unit -J293 (version for pressure switch -F129)
Heating, Air Conditioner - Edition 06.2000
Specified value
- approx. battery
voltage
Specified value
- approx. battery
voltage
Specified value
- Radiator fan run‐
ning at speed 2
Audi A3 1997 ➤
Remedies if speci‐
fied value not at‐
tained
- Use circuit flow di‐
agram to locate and
rectify open circuit or
short circuit to earth
in the wiring be‐
tween control unit
-J293 and -E87.
Renew operating
and display unit -
E87.
Remedies if speci‐
fied value not at‐
tained
- Use current flow di‐
agram to rectify volt‐
age supply to pres‐
sure switch -F129.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween pressure
switch -F129 and
control unit -J293.
Remedies if speci‐
fied value not at‐
tained
- Use current flow di‐
agram to rectify volt‐
age supply to pres‐
sure switch -F129.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring be‐
tween control unit -
J293 and fans -V7.
Service radiator fan
-V7.
Control unit -J293
defective - replace.
73