Audi A3 1997 Manual page 81

Test step 3 (actuation of magnetic clutch)
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
3.1 Connector
A contact 8
and
connector
A, contact 6
Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)
Test step Contact at
connector to
-J293
3.2 Connector A
contact 4
and
connector A,
contact10
Testing of ▪ Test conditions
- Additional opera‐
tions
"Compressor ON" ▪ Engine running
signal from -E87 ▪ Operating and dis‐
play unit -E87 in
"auto" mode (com‐
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▪ No compressor
shutoff condition is
displayed in the -
E87 measured val‐
ue block (display
group 001).
Testing of ▪ Test conditions
- Additional opera‐
tions
Actuation of air con‐ ▪ Ignition on.
ditioner magnetic
clutch -N25
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
- Less than 10 A
Magnetic clutch
clicks (when apply‐
ing voltage)
Audi A3 1997 ➤
Remedies if specified
value not attained
- Use current flow di‐
agram to locate and
eliminate open circuit
or short to positive or
earth in the wiring be‐
tween pressure
switch -F129, temper‐
ature switch -F14 and
control unit -J293.
Refrigerant tempera‐
ture switch -F14 de‐
fective (open) or re‐
frigerant too hot -
check.
=> Current Flow Dia‐
grams, Electrical
Fault-Finding and Fit‐
ting Locations
Remedies if specified
value not attained
- Use current flow di‐
agram to locate and
eliminate open circuit
or short to earth in the
wiring between con‐
trol unit -J293 and
magnetic clutch -N25.
Open circuit in the
earth connection to
magnetic clutch -N25
=> Current Flow Dia‐
grams, Electrical
Fault-Finding and Fit‐
ting Locations
Magnetic clutch de‐
fective - rectify.
75