ABS AUDI A4 1998 B5 / 1.G Brakes ESP Electrical Testing Service Manual

01-346

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
23 - Voltage supply for
ABS return flow
pump relay -J105-
via terminal 30
Repair Manual, Brake System,
Repair Group 45
- Remove ABS return flow pump relay
-J105-.


- Check voltage supply for ABS return
flow pump relay -J105- at terminal 30
for open circuit or short circuit to
Ground (GND). 10.5 to
14.5 V
Electrical Wiring
Diagrams, Troubleshooting
& Component Locations - Check the relevant fuse,
60A, and repair wire
damage.
Pa
ge 56 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-347

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
24 -

Ground (GND) supply and voltage
supply for ABS return flow pump -
V39-
Repair Manual, Brake
System, Repair Group 45
- Remove ABS return flow
pump relay -J105-.


See continuation on next page
Pa
ge 57 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-348
Continuation: Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
24 -

Ground (GND)
supply and voltage
supply for ABS
return flow pump -
V39- - Check wiring from ABS return flow pump relay -
J105- (terminal 87) to ABS control module -J104-
(terminal 20) and to ABS hydraulic unit -N55-
(terminal 14) for open circuit or short circuit to B+
or Ground (GND).
- Fix the
wiring
problem.

See continuation on next page
Pa
ge 58 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-349
Continuation: Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
24 -

Ground (GND) supply
and voltage supply for
ABS return flow pump -
V39- - Check the Ground (GND) for
ABS return flow pump at ABS
hydraulic unit (terminal 13).
- Fix the open circuit
or short circuit to B+ in
Ground (GND).

See continuation on next page
Pa
ge 59 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-350
Continuation: Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
24 Bridge
7 + 28,
1 + 2
Function of
ABS return
flow pump
relay -J105-.
ABS return flow
pump relay -J105-
installed

- Use VAG1598/20 to
measure voltage
between terminals 20
and 29.
Voltage should be
between 10.5 to
14.5 V between
terminals 20 and
29.

- Switch on ignition for
max. 10 seconds and
switch off again. ABS return flow
pump -V39- runs - If you do not measure any
voltage between terminals 20
and 29, replace the relay.
- If you measure voltage
between terminals 20 and 29,
the ABS return flow pump is
malfunctioning. Replace ABS
hydraulic unit -N55-.
Pa
ge 60 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-351

Voltage measurement; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work steps Specified
value Corrective action
25 51 + 28 ABS control module -J104- is
supplied with power at terminal 51
from terminal 30. The ABS control
module -J104- uses this voltage
supply as a voltage supply for the
hydraulic pump for traction control
-V156. - Check the wiring from ABS
control module -J104-
(terminal 51) to terminal 30 for
open circuit and short circuit to
Ground (GND). 10.5 to
14.5 V
Electrical Wiring
Diagrams,
Troubleshooting &
Component Locations - Check the relevant
fuse, 25A, and repair
the wiring problem.
Pa
ge 61 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.16