Audi A8 1994 Service Manual page 13

Readout on VAS 5051 Possible cause of trouble
Readout on VAS 5051
01311
Data bus information
- Defective
- In one-wire operating mode - Data bus working only on one wire
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Readout on VAS 5051 Possible cause of trouble
01312
Drive train data bus
- Defective
Readout on VAS 5051 Possible cause of trouble
01314
Engine control unit
- No communication
Electrical system Self-diagnosis 02.99 ➤ - Edition 05.2002
- Radio defective
Possible cause of trouble
- CAN bus fault
- Open circuit in wiring or short at con‐
trol unit in information (display) data
bus
- "1" not displayed in measured value
block 140 for control unit with CAN ca‐
pability =>Page
- Dash panel insert adaption not per‐
formed correctly
- CAN bus fault
- Open circuit in wiring or short at control
unit in drive train data bus
- "1" not displayed in measured value block
125 for control unit with CAN capability
=>Page 27
- The dash panel insert was not correctly
adapted
- CAN bus fault
- Open circuit in wiring or short
- Wiring damage
- "1" not displayed in measured value block
125 for engine control unit =>Page
- Dash panel insert adaption not performed
correctly
- Engine control unit defective
Remedy
- Replace radio
=> Radio, Telephone and Navigation Sys‐
tems; Repair Group 91; Radio system; Re‐
moving and installing radio Radio system;
Removing and installing radio
Remedy
- Use current flow diagram to perform
fault-finding
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations bind‐
er
- Select adaption channel 62 and enter
correct adaption value => Page
28
- Check data exchange => Page
Use current flow diagram to perform
fault-finding
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations bind‐
er
Remedy
- Use current flow diagram to perform fault-
finding
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations binder
- Select adaption channel 60 and enter cor‐
rect adaption value => Page
Remedy
- Use current flow diagram to perform fault-
finding
=> Current Flow Diagrams, Electrical
Fault-finding and Fitting Locations binder
- Select adaption channel 60 and enter cor‐
27 rect adaption value => Page
- Replacing engine control unit
=> Repair Group 23; of relevant engine
code
Audi A8 1994 ➤
65
69
62
62
1.5 - Fault table
9