fuel AUDI A4 1999 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual

24-173

Wire for crash signal, checking

The Engine Control Module (ECM) receives the
crash signal ("Crash shut-off was triggered") from
the airbag control module.
When the airbag control module sends the crash
signal to the ECM (during an accident or when
output DTM is being performed for the airbag
system), the ECM switches the Fuel Pump (FP)
off. This means that the engine will stop running
but can be started again afterward (e.g. to
remove vehicle from danger).

- 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
Control module for
Airbag -J234-
Terminal
67 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
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gnals, checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.FU07.24.5

24-176

Wire for fuel level signal, checking


Notes:

The signal helps with cause localization when
certain malfunctions are recognized (e.g.
combustion misfires).
The fuel level signal is transferred from the
instrument cluster to the Engine Control Module
(ECM) via CAN-bus. Check data exchange
between Engine Control Module (ECM) and
other CAN capable control modules Page 24
-178

Pa
ge 15 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