Page 25 of 27
24-174
Example 2:
From the DTCs stored in the memories, you have determined that control
module 2 is not communicating with control modules 1 and 3.
Electrical Wiring Diagrams, Troubleshooting & Component Locations Control module
DTCs stored in DTC memories:
1
Missing signal from control module 2
2 Missing signal from control module 1Missing signal from control module 3
3 Missing signal from control module 2
- Switch ignition off.
- Disconnect control modules connected across bus wires and check
bus wires for an open circuit. - Replace control module 2 if no malfunctions can be found in bus wires.
Pa
ge 25 of 27 Additional si
gnals, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.5
Page 26 of 27
24-175
Example 3:
Using the DTCs stored in the memories, you
have determined that none of the control
modules are sending or receiving signals.
Control
module
DTCs stored in DTC
memories:
1
Powertrain databus faulty
2 Powertrain databus faulty
3 Powertrain databus faulty
- Switch ignition off.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Disconnect control modules connected across bus wires and check
bus wires for a short circuit to B+ and Ground (GND).
Pa
ge 26 of 27 Additional si
gnals, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.5
Page 27 of 27
24-176
If you cannot determine a cause for the DTC
"Powertrain databus malfunction, check
whether the DTC is caused by one of the
control modules.
All control modules that use the CAN-bus are still
disconnected. Ignition is switched off.
- Connect one control module.
- Connect VAG 1551 scan tool. Switch ignition on,
and erase DTC memory of control module just
connected. End scan tool output using "End
Output" function 06.
- Switch ignition off and then on.
- Leave ignition on for 10 seconds. Read DTC
memory of control module just connected.
- If DTC "Powertrain databus malfunction" is
displayed, replace control module just
connected.
- If DTC "Powertrain databus malfunction" is not
displayed, connect next control module and
repeat procedure.
Pa
ge 27 of 27 Additional si
gnals, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.24.5
