1996 AUDI A4 ignition

01-166

Electrical testing


If the On Board Diagnostic (OBD) sequence
does not provide any indication of the source of
the malfunction, work through all of the
electrical test steps.
If the OBD sequence identifies the source of the
malfunction, only carry out the test steps
recommended in the DTC table (specific
testing).

Test requirements
The "Automatic Test Sequence" was carried
out and it was determined that the
Transmission Control Module (TCM) and
Engine Control Module (ECM) only contain
DTCs relating to ABS/EDL.

- Connect the VAG1551 Scan Tool (ST) and
select the address word 00 with ignition
switched on;

- After completing electrical test, check and
erase DTC memories of Transmission Control
Module (TCM) and Engine Control Module
(ECM).
Pa
ge 20 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

01-167


Note:
The operation manual for the VAS1978 wiring harness repair kit generally
forbids the repair of any lines in the ABS or related systems. This rule only
pertains to the shielded lines in these systems.
Multi-pin harness connector for ABS control module -J104- in proper
condition, with no bent, broken or corroded terminals. Replace any
damaged terminals using VAS1978 wiring repair kit. Ignition and electrical consumers switched off before beginning
testing (headlights, lighting, fan, etc.).
Pa
ge 21 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

01-169

Connect VAG1598 test box using VAG1598/27
adapter.

- Switch ignition off.

- Connect VAG1598/27 adapter and VAG1598
test box. Disconnect multi-pin connector from
ABS control module -J104-. Connect
VAG1598/27 adapter and VAG1598 test box to
connector of ABS/EDL wiring harness.
The socket designations on the VAG1598 test
box are identical to the terminal designations on
the ABS control module -J104- and on the wiring
harness connector.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Terminal assignment of multi-pin connector at wiring harness / ABS
control module (w/EDL) -J104-
Note:
All terminals omitted here are not occupied at the moment and must not
be connected to other components!
Pa
ge 23 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

01-174
Test table Set measurement range:
voltage test (20 V =)
Test
step VAG
1598
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
1 19 + 15 Voltage supply to ABS
control module -J104- via
terminal 15 Ignition
switched on. 10.0 - 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check wire from terminal 19 to
Ground (GND).
- Check wire from terminal 15 to
terminal 15.
Pa
ge 29 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

01-175

Set measurement range:
voltage test (20 V =)
Test
step VAG
1598
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
2 16 + 17 Voltage supply of ABS hydraulic unit -
N55- and motor for ABS hydraulic
pump -V64- via terminal 30 at ABS
control module (w/EDL) -J104- Ignition
switched on. 10.0 - 14.5
V - Check wire from terminal
16 to Ground (GND).
16 + 18 10.0 - 14.5
V

Electrical Wiring Diagrams,
Troubleshooting &
Component Locations - Check wiring from
terminals 17 and 18 to B+
(terminal 30) via fuse (60A).
Pa
ge 30 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

01-176

Set measurement range:
voltage test (20 V =)
Test
step VAG
1598
sockets Test of
Test requirements
- Additional work
steps Specified
value Corrective action
3 19 + 14 Function of brake
light switch -F- Ignition switched
off
- Check wire from terminal 19 to Ground
(GND).
Brake pedal not
depressed
- Operate brake pedal.0.0 -0.5 V

10.0 - 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component Locations

Repair Manual, Brake System, Repair
Group 45
- Check wiring from terminal 14 to
terminal 30 via fuse (10A).
- Check brake light switch -F-
- Adjust brake light switch -F-.
Pa
ge 31 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