1997 AUDI A4 wheel

01-160

Continue output Diagnostic Test Mode (DTM)
in order to check the front right, rear left, and
rear right wheels in sequence. The test steps
indicate the procedure for the front left wheel.
They will therefore not be repeated in detail. Output Diagnostic Test Mode (DTM)
-
Operate brake

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Ifr: 0V
Ofr: 0V
fr wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Ifr: B+
Ofr: 0V
fr wheel locked

Indicated on display:
ABS/EDL hydraulic pump -V64- must start running.
The brake pedal must not give. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Ifr: B+
Ofr: B+
fr wheel free

Indicated on display:
ABS/EDL hydraulic pump -V64- will stop running. -
Press button.
Pa
ge 13 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-161

Output Diagnostic Test Mode (DTM)
-
Ifr: B+
Ofr: 0V
fr wheel free

Indicated on display:
Brake pedal must give noticeably. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Ifr: 0V
Ofr: 0V
fr wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Release brake

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Operate brake

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Irl 0V
Orl: 0V
rl wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Irl B+
Orl: 0V
rl wheel locked

Indicated on display:
ABS/EDL hydraulic pump -V64- must start running.
The brake pedal must not give. -
Press button.
Pa
ge 14 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-162

Output Diagnostic Test Mode (DTM)
-
Irl B+
Orl: B+
rl wheel free

Indicated on display:
ABS hydraulic pump -V64- will stop running. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Irl B+
Orl: 0V
rl wheel free

Indicated on display:
Brake pedal must give noticeably. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Irl 0V
Orl: 0V
rl wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Release brake

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Operate brake

Indicated on display:
-
Press button.
Pa
ge 15 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-163

Output Diagnostic Test Mode (DTM)
-
Irr: 0V
Orr: 0V
rr wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Irr: B+
Orr: 0V
rr wheel locked

Indicated on display:
ABS/EDL hydraulic pump -V64- must start running.
The brake pedal must not give. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Irr: B+
Orr: B+
rr wheel free

Indicated on display:
ABS/EDL hydraulic pump -V64- will stop running. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Irr: B+
Orr: 0V
rr wheel free

Indicated on display:
Brake pedal must give noticeably. -
Press button.
Output Diagnostic Test Mode (DTM)
-
Irr: 0V
Orr: 0V
rr wheel locked

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Release brake

Indicated on display:
Pa
ge 16 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-164

Output Diagnostic Test Mode (DTM)
-
EDL valves/ Hydr-P : B+ Wheel fl/fr lock

Indicated on display: Only significant for troubleshooting on
vehicles with EDL, starting with production deadline of calendar
week 21/1997. For these vehicles, the test step was modified in
parallel to implementation of EBD emergency mode. Prior to
production deadline of calendar week 21/1997, the hydraulic pump is
not activated. This test step does not apply to vehicles without EDL.
The vehicle version, as relates to EBD, can be recognized by checking
the note column under "Check control module version"; page 01
-128
.

The EDL change-over valve (left) and the EDL inlet valve are activated.
ABS return flow pump -V39- runs for one second. It draws brake fluid from
the brake fluid expansion tank via the EDL inlet valve. The hydraulic pump
builds brake fluid pressure in the EDL regulated wheel cylinders. These
wheels will then be locked.
If not, this indicates a mechanical malfunction in one of the valves,
providing there is no electrical malfunction in the system. Replace
hydraulic control unit.
This test step cannot be performed on vehicles that are not equipped with
EDL. These vehicles lack the EDL valves and the pressure relief valve.
Pa
ge 18 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-170

Terminal
Wire connection to component ...
1
Right rear ABS wheel speed sensor -G44- 2
Right rear ABS wheel speed sensor -G44-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR for vehicles with All Wheel Drive (AWD) and ABS/EDL
3
Right rear ABS wheel speed sensor -G44-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL
3
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
4
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS/EDLfor vehicles with All Wheel Drive (AWD) and ABS/EDL
5
Right front ABS wheel speed sensor -G45- 6
Left front ABS wheel speed sensor -G47- 7
Left front ABS wheel speed sensor -G47- 8
Left rear ABS wheel speed sensor -G46- 9
Left rear ABS wheel speed sensor -G46-
Pa
ge 24 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-177

Set measurement range:
Resistance measurement (2 k ) Test
step VAG
1598
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
4
4 + 5
1) 2)
3 + 5
3) Resistance of right
front ABS wheel
speed sensor -G45-
- Check electrical wiring between control
module and wheel speed sensor for open
circuit and for short circuit to Ground
(GND) or B+
5 6 + 7

(all
versions) Resistance of left
front ABS wheel
speed sensor -G47-
Ignition
switched off 400 2300
Electrical Wiring Diagrams,
Troubleshooting & Component Locations - Check harness connectors.
- Move wire during test (loose contact).- Replace the relevant ABS wheel speed
sensor if specified value is not obtained
and the electrical wiring is OK.
1) Assignment of wheel speed sensor terminals for vehicles with Front Wheel Drive (FWD) and equipped with EDL. 2) Assignment of wheel speed sensor terminals for vehicles with All Wheel Drive (AWD) and equipped with EDL. 3) Assignment of wheel speed sensor terminals for vehicles with Front Wheel Drive (FWD) and equipped with ASR.
Pa
ge 32 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13

01-178

Set measurement range:
Resistance measurement (2 k ) Test
step VAG
1598
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
6
1 + 3
1)
1 + 2
2) 3) Resistance of right
rear ABS wheel
speed sensor -G44-
- Check electrical wiring between control
module and wheel speed sensor for open
circuits and for short circuit to Ground
(GND) or B+
7 8 + 9

(all
versions) Resistance of left
rear ABS wheel
speed sensor -G46-
Ignition
switched off 400 2300
Electrical Wiring Diagrams,
Troubleshooting & Component Locations - Check harness connectors.
- Move wire during test (loose contact).- Replace the relevant ABS wheel speed
sensor if specified value is not obtained
and the electrical wiring is OK.
1) Assignment of wheel speed sensor terminals for vehicles with Front Wheel Drive (FWD) and equipped with EDL. 2) Assignment of wheel speed sensor terminals for vehicles with All Wheel Drive (AWD) and equipped with EDL. 3) Assignment of wheel speed sensor terminals for vehicles with Front Wheel Drive (FWD) and equipped with ASR.
Pa
ge 33 of 66 Out
put Dia
gnostic Test Mode
(DTM
) (function 03
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.13