heating AUDI A4 1998 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual

24-171


Display on VAS5051:
1 - Enter display group Max. input value = 255
- Select function "050" in button field -2- for "display group number 050"
and press Q button to confirm input.

Display on VAS5051:
- Switch A/C system off.

Specified value in display field -4-: Compr. OFF
- Switch A/C system on using "Auto" button and adjust A/C system to
maximum cooling or heating power. Compressor must run.
Specified value in display field -4-: Compr. ON
- Depress gas pedal completely (swiftly) and then release it (brief
acceleration).
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Display on VAS5051:
If indications do not resemble description:
Repair Manual, Heating & Air Conditioning, Repair Group 01; On Board Diagnostic (OBD) of A/C system

Specified value in display field -4-: Indication jumps for a few
seconds from "Compr. ON" to "Compr. OFF" (compressor is
switched off when vehicle accelerates).
- Connect VAG1598/31 test box at wiring harness to Engine Control
Module (ECM), do not connect ECM Page 24
-19
.
- Check the following wire connection for open circuit and short circuit to
Ground (GND) and B+:
Test box
VAG1598/31
Socket
A/C control
head -E87-
Terminal
41 Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- Repair open circuit or short circuit if necessary.
- If there are no malfunctions in the wiring, check function of A/C system.
Pa
ge 11 of 25 Additional si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU07.24.5