diagram AUDI A4 1997 B5 / 1.G AWM Engine Additional Signals Checking Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A4, Model: AUDI A4 1997 B5 / 1.GPages: 25, PDF Size: 0.13 MB
Page 2 of 25

24-164
Engine speed signal, checking
Note:
The engine speed signal is output at terminal 37
of the Engine Control Module (ECM). The signal
is used, among other things, for RPM display in
the instrument cluster.
- 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
Instrument cluster
Terminal
37 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
- Repair open circuit or short circuit if
necessary.
Pa
ge 2 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
Page 7 of 25

24-168
If LED does not blink:
- Check the following wire connection for open
circuit and short circuit to Ground (GND) and B+:
Test box
VAG1598/31
Socket
Instrument cluster
Terminal
54 Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
- Repair open circuit or short circuit if
necessary.
Pa
ge 7 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
Page 11 of 25

24-172
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
Page 12 of 25

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
Pa
ge 12 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
Page 13 of 25

24-174
- Repair open circuit or short circuit if
necessary.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations If no malfunctions are found in wire:
- Check DTC memory of control module for
airbag:
Repair Manual, Body On Board Diagnostic
(OBD), Repair Group 01; On Board Diagnostic (OBD) of airbag system BAE (basic trigger unit) with side airbag; DTC memory, checking
Pa
ge 13 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
Page 22 of 25

24-183
Example 1:
From the DTCs stored in the memories, you have determined that control
module 1 is not communicating with control modules 2 and 3.
Electrical Wiring Diagrams, Troubleshooting & Component Locations Control module
DTCs stored in DTC memories:
1
Missing signal from control module 2Missing signal from control module 3
2 Missing signal from control module 1
3 Missing signal from control module 1
- Switch ignition off.
- Disconnect the control modules connected across the bus wires and
check the bus wires for an open circuit. - Replace control module 1 if no malfunctions can be found in the bus
wires.
Pa
ge 22 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
Page 23 of 25

24-184
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 the control modules connected across the bus wires and
check the bus wires for an open circuit. - Replace control module 2 if no malfunctions can be found in the bus
wires.
Pa
ge 23 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
Page 24 of 25

24-185
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 CAN-bus faulty
2 Powertrain CAN-bus faulty
3 Powertrain CAN-bus faulty
- Switch ignition off.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Disconnect the control modules connected across the bus wires and
check bus wires for a short circuit to B+ and Ground (GND).
Pa
ge 24 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