warning AUDI A4 2000 B5 / 1.G AC System On Board Diagnostic Workshop Manual

01-16

Safety precautions

If special testing equipment is required during
road test, note the following:

WARNING!

Special testing equipment must always be
secured on the back seat and must be
operated from there by a 2nd person.
If special testing equipment were to be
operated from the passenger seat, there
could be injuries to the person seated there
in the event of an accident and air bag
deployment.
Pa
ge 20 of 91 A/C s
ystem, On Board Dia
gnostic
(OBD
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.1

01-47

VAG1551 scan tool
display Specified function
Corrective action
Fresh Air Blower V2





Caution:
Coolant Fan coming on !
Warning:
The next forwarding of program with the
button will cause Coolant Fan V7 to come
on. Keep clear of Coolant Fan! - V2 runs for 2 seconds with 0V, 3V, 6V, 9V,
12V, 15V, 0V applied.
- Check that fresh air blower operates freely
- Test ground connection to Control Module
for Fresh Air Blower J126 using wiring
diagram
- J126 electrical test page 01
-115
- Replace -E87-
Coolant Fan V7
- V7 (1st stage) switched on and off every 5
seconds - Test wiring/connections between -E87- and
J26 for open circuit or short circuit to positive
using wiring diagram
- Coolant Fan Control (FC) Relay J261)
electrical test page 01
-115

- Replace -E87-
Fresh Air/Recirculating
Flap Two-Way Valve N63
2) - N63 switches from fresh air to recirculating
air every 5 seconds - Check vacuum supply to -N63-
page 87
-187

- Test voltage supply to N63 and circuit to -
E87- for open circuit or short circuit to ground
using wiring diagram
Pa
ge 67 of 91 A/C s
ystem, On Board Dia
gnostic
(OBD
)
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.HA01.01.1