Audi A3 1997 - Page 86

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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
2.3 Connector
A
and
connector
B attached
to -J293
"Fan ON" signal (2nd
speed) from temper‐
ature switch -F18.
▪ only to be per‐
formed in vehicles
without map-control‐
led cooling
▪ Connector de‐
tached from tem‐
perature switch -
F18/-F54, and con‐
tacts 2 and 3 jum‐
pered
▪ Ignition on.
- Radiator fan run‐
ning at speed 2
- Use current flow di‐
agram to locate and
eliminate open cir‐
cuit in the wiring to
fans -V7.
Service radiator fan
-V7.
Control unit -J293
defective - replace.
Notes:
◆ The test step 2.3 is only to be performed in vehicles without 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).
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
2.4 Connector
A contact
11
and
connector
A, contact 6
Fan on signal (vent
run out) from engine
control unit.
▪ only to be per‐
formed in vehicles
with 81 KW diesel
engine
▪ Ignition on.
Actuate this control
element in the final
control diagnosis for
the engine control
unit.
=> Relevant Work‐
shop Manual Diesel
Direct Injection and
Preglow 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 posi‐
tive or earth in the
wiring between -
E87 and control unit
-J293.
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
2.5 Connector
A contact
11
and
connector
A, contact 6
Fan on Signal (fan
actuation speed 1)
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 2.5 is only to be performed in vehicles with map-controlled engine cooling.
Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
80 01 - Self-diagnosis, Electrical check