Audi A3 1997 Manual page 72

Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
maximum specified value, all connectors on the other positioning motor would have to be detached during
the measurement; the motors are connected in parallel).
◆ If -E87 detects the fault "potentiometer short to earth or open circuit/short to positive", check all the poten‐
tiometers (in the 4 positioning motors) and the corresponding wiring.
◆ On vehicles with right-hand drive, connections 1 and 2 as well as 4 and 6 on the positioning motor are
reversed (check part number and current flow diagram).
Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (200 ω)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
4.3 21
and
22
Select measuring range on hand-held multimeter V.A.G 1526:
Resistance measurement (200 ω)
- Adapter cable V.A.G 1598/11 connected
Test step V.A.G 1598
socket
4.4 26
and
27
4.5 28
and
29
4.6 23
and
24
Test step 5
Pressure signal from radiator control unit for refrigerant -J293, output "air conditioner compressor cut-in", signal
"engine temperature too high"
Select measuring range on hand-held multimeter V.A.G 1526:
Voltage measurement (20V =)
- Adapter cable V.A.G 1598/12 connected
Test step V.A.G 1598
socket
5.1 7
and
14
66
01 - Self-diagnosis, Electrical check
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Testing of
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.
Temperature flap
positioning motor -
V68
Testing of
Central flap position‐
ing motor -V70
Air flow flap position‐
ing motor -V71
Footwell/defroster
flap positioning mo‐
tor -V85
Testing of ▪ Test conditions
- Additional opera‐
tions
Signal from radia‐ ▪ Ignition on.
tor fan control unit -
J293.
▪ Test conditions Specified value Remedies if specified
- Additional opera‐
tions
- 20 ωto 100ω. - Use current flow di‐
▪ Test conditions Specified value Remedies if specified
- Additional opera‐
tions
- 20 ωto 100ω. - Use current flow di‐
- 20 ωto 100ω. - Replace positioning
- 20 ωto 100ω.
Specified value
- approx. battery
voltage
value not attained
agram to locate and
eliminate open circuit,
contact resistance or
short circuit
Replace positioning
motor
value not attained
agram to locate and
eliminate open circuit,
contact resistance or
short circuit
motor
Remedies if specified
value not attained
- Use current flow dia‐
gram to locate and
eliminate open circuit
or contact resistance.
Check high-pressure
sensor (=>Page
85 ).