Audi A3 1997 Manual page 87

◆ 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
2.6 Connector
A contact 7
and
connector
A, contact 6
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
3.1 Connector
A contact 4
and
connector
A, contact
10
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
Fan on Signal (fan ▪ Ignition on.
actuation speed 2) Actuate this control
from engine control element in the final
unit. control diagnosis for
▪ only to be per‐ the engine control
formed in vehicles unit.
with map-controlled => Relevant Work‐
engine cooling shop Manual Injec‐
tion and Ignition
system
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 air con‐ ▪ Ignition on.
ditioner magnetic
clutch -N25
Testing of ▪ Test conditions
- Additional opera‐
tions
11.3 - Electrical check at control unit -J293 (version for High-pressure sensor -G65)
Heating, Air Conditioner - Edition 06.2000
Specified value
- approx. battery
voltage during the
actuation
Specified value
- Less than 10 A
Magnetic clutch
clicks (when apply‐
ing voltage)
Specified value
Audi A3 1997 ➤
Remedies if speci‐
fied value not at‐
tained
- 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.
Remedies if specified
value not attained
- 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.
Remedies if speci‐
fied value not at‐
tained
81