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with respect to the correctness of information in this document. Copyright by AUDI AG.
◆ In vehicles with map-controlled cooling the radiator fans are switched on and off by the engine control unit
dependent on the engine load and the refrigerant temperature (temperature switch -F18/-F54 is not instal‐
led).
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
2.6 Connector
A contact 7
and
connector
A, contact 6
Fan on Signal (fan
actuation speed 2)
from engine control
unit.
▪ only to be per‐
formed in vehicles
with map-controlled
engine cooling
▪ Ignition on.
Actuate this control
element in the final
control diagnosis for
the engine control
unit.
=> Relevant Work‐
shop Manual Injec‐
tion and Ignition
system
- approx. battery
voltage during the
actuation
- Check output at
engine control unit.
Use current flow di‐
agram to locate and
eliminate open cir‐
cuit or short to earth
in the wiring be‐
tween engine con‐
trol unit and control
unit -J293.
Notes:
◆ The test step 2.6 is only to be performed in vehicles with map-controlled engine cooling.
◆ In vehicles with map-controlled cooling the radiator fans are switched on and off by the engine control unit
dependent on the engine load and the refrigerant temperature (temperature switch -F18/-F54 is not instal‐
led).
Test step 3 (actuation of magnetic clutch)
Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)
Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if specified
value not attained
3.1 Connector
A contact 4
and
connector
A, contact
10
Actuation of air con‐
ditioner magnetic
clutch -N25
▪ Ignition on. - Less than 10 A
Magnetic clutch
clicks (when apply‐
ing voltage)
- Use current flow dia‐
gram 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.
Select measuring range on hand-held multimeter V.A.G 1526:
Current measurement (20 A=)
Test step Contact at
connector
to -J293
Testing of ▪ Test conditions
- Additional opera‐
tions
Specified value Remedies if speci‐
fied value not at‐
tained
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65) 81
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