traction control AUDI A4 1998 B5 / 1.G Brakes ESP Electrical Testing User Guide

01-337
Continuation: Function test: Traction control indicator light -K86-
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
19

Continuation: - Function of
traction
control
indicator light
-K86- - Switch on
ignition Traction control
indicator light -K86-
comes on for two
(2) seconds and
then goes out.
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - If traction control indicator light does
not light up, check vehicle voltage and
wire from terminal 31 of ABS control
module -J104- to instrument cluster for
short circuit to B+ and open circuit.
- If traction control indicator lights
continuously, test wiring from terminal
31 of ABS control module -J104- to
instrument cluster for short circuit to
Ground (GND).

See continuation on next page
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01-338
Continuation: Function test: Traction control indicator light -K86-
Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
19 - Function of
traction control
indicator light -
K86-
Repair Manual, Electrical Equipment, Repair
Group 90; Instrument cluster
- Are voltage of electrical system OK and wiring
from terminal 31 of ABS control module -J104-
to instrument cluster intact? malfunction in
instrument cluster
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01-339

Function test: Traction control button; set measurement range on VAG1526: 20 V =
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
20 - Function of
ASR/ESP button Ignition switched off Function of traction control indicator light -
K86- already checked in step 19. Multi-pin connector connected to ABS control
module -J104- and retainer catch engaged.

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01-340
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 - Function of
ASR/ESP
button
- Switch on ignition

- Press ASR/ESP
button Traction control
indicator light -K86-
lights up - Switch off ignition.
- Detach multi-pin connector from
ABS control module -J104- and
remove.

- Press ASR/ESP
button again Traction control
indicator light -K86-
goes out - Connect VAG1598/20 test box.

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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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01-351

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.
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