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

01-341
Continuation: Function test: Traction control button; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work
steps Specified
value Corrective action
20 28 + 44 Function of
ASR/ESP button Ignition switched
on.

- ASR/ESP button not
pressed 0.0 to 1.0 V
Electrical Wiring Diagrams,
Troubleshooting & Component Locations
- Check wire from terminal 28 to Ground
(GND).
- Check wiring from terminal 44 to
traction control button, terminal 6.
- Check voltage supply from terminal 5
of ASR/ESP button to terminal 15.

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01-342
Continuation: Function test: Traction control button; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
20 28 + 44 Function of
ASR/ESP
button
- ASR/ESP button
pressed 10.0 to 14.5
V

Electrical Wiring Diagrams,
Troubleshooting & Component Locations - Check wire from terminal 28 to Ground
(GND).
- Check wiring from terminal 44 to traction
control button, terminal 6.
- Check voltage supply from terminal 5 of
ASR/ESP button to terminal 15.
- If no malfunctions can be found using the
procedures in these steps, replace the
ASR/ESP button.
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01-343

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
21 1 + 28
1 + 29 Voltage supply to ABS
control module -J104- via
terminal 15 Ignition
switched on. 10.5 to 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check wiring from terminals 28
and 29 to Ground (GND).
- Check wiring from terminal 1 to
terminal 15 via fuse (10A).
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01-344

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
22 - Voltage supply of
solenoid valves via
ABS solenoid valve
relay -J106-.
Repair Manual, Brake System,
Repair Group 45
- Remove ABS solenoid valve relay -
J106-.


- Check voltage supply for ABS
solenoid valve relay -J106- at terminal
30 for open circuit or short circuit to
B+ or Ground (GND). 10.5 to
14.5 V
Electrical Wiring
Diagrams, Troubleshooting
& Component Locations - Check the relevant fuse,
25A, and repair the wiring
problem.

See continuation on next page
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01-345
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
22 - Voltage supply of
solenoid valves
via ABS solenoid
valve relay -J106-
.
- Check wiring from ABS solenoid valve
relay -J106- (terminal 87) to ABS
hydraulic unit -N55- (terminal 10) for
open circuit or short circuit to B+ or
Ground (GND).
- Fix the wiring problem.
- If the power supply lines
are OK, replace the relay.
- If the original malfunction
"ABS solenoid valve relay -
J106-" is still not fixed,
replace the ABS hydraulic
unit.
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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.
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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-.


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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.

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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
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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-.
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pair&id=AUDI.B5.SU02.01.16