Audi A8 1994 Service Manual page 93

Motronic injection and ignition system (6-cylinder) - Edition 02.1999
Rapid data transfer
Select function XX
- Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
-> Indicated on display:
Read measured value block
Enter display group number XXX
- Press keys 0, 5 and 0 to select Display Group 50 and confirm entry with the Q key.
-> Indicated on display:
Read measured value block 50
Enter display group number XXX
- Check air conditioner compressor shut-off (display zone 4).
Display Group 50: Signals to engine control unit
Display xxx rpm
Indicates Actual engine speed
(true value)
Range
Specification
- Switch on the air conditioner by pressing the "Auto" button. The compressor should run (display zone 4).
- Set air conditioner to maximum hot/cold air output (display zone 3).
Display Group 50: Signals to engine control unit
Display xxx rpm
Indicates Actual engine speed
(true value)
Range
Specification
- Switch off compressor with controls on A/C operating and display unit.
- Specification for display zone 4: The display should change from "Compr.ON" to "Compr.OFF".
If the readout in display zone 4 is not as described:
- Switch off ignition.
- Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine
control unit itself.
=> Page 30 .
Test the following wiring connections for open circuit and/or short to positive or earth.
Test box V.A.G 1598/31, socket
41
HELP
1 2
xxx rpm
Specified engine speed
(theoretical value)
1 2
xxx rpm
Specified engine speed
(theoretical value)
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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.
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
Display zones
3
A/C-Low
Air conditioner require‐
ment
A/C-Low
A/C-High
A/C-Low
Display zones
3
A/C-High
Air conditioner require‐
ment
A/C-Low
A/C-High
A/C-High
Air conditioner, contact
8.3 - Testing air conditioner compressor shut-off
Audi A8 1994 ➤
4
Compr. OFF
A/C compressor status
Compr. OFF
Compr. ON
Compr. OFF
4
Compr. ON
A/C compressor status
Compr. OFF
Compr. ON
Compr. ON
89