1998 AUDI A4 traction control

01-86

Function test and check for proper seal
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
18 Bridge
1 + 2,
7 + 37,
37 + 28
ABS return
flow pump -
V39-
Right front
traction
control
switch-over
valve -N166-
Right front
traction
control outlet
valve -N167- Repair Manual, Brake
System, Repair Group 47
- Connect VAG1310A
pressure gauge to front
RIGHT brake caliper
and bleed.
- Bridge terminals 55 +
28
Repair Manual, Brake System,
Repair Group 45
- ABS return flow pump
malfunctioning, replace ABS
hydraulic unit -N55-


Pressure
relief valve in
ABS hydraulic
unit -N55-
Right front
ABS outlet
valve -N100- - Switch on ignition for
max. 10 seconds and
switch off again.
Right front
traction control
switch-over
valve -N166-
switched ABS return
flow pump -
V39- runs Pressure on
pressure - Check right front traction control
switch-over valve -N166- and right
front traction control outlet valve -
N167- via resistance test test
steps 5 + 6. Replace ABS hydraulic
unit -N55- if malfunctioning.
Pa
ge 39 of 79 Read Measurin
g Value Block
(function 08
)
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01-87

Function test and check for proper seal
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work
steps Specified value
Corrective action
18

Continuation:

Left rear
ABS
outlet
valve -
N136- - Bridge terminals 27
+ 28
- Switch on ignition for
max. 10 seconds and
switch off again.
Front Wheel Drive
(FWD):
170 25 bar
All-Wheel Drive
(AWD), pressure
regulation (ABS):
90 25 bar
Right front
traction control
outlet valve -
N167- switchedPressure
increases on
pressure
gauge:
- Pressure relief valve and/or right
front ABS outlet valve -N100-
and/or left rear ABS outlet valve -
N136- malfunctioning. Replace
ABS hydraulic unit -N55-.

- Remove VAG1310A
pressure gauge and
bleed brakes All Wheel Drive
(AWD), throttle
valve regulation:
170 25 bar

Pa
ge 41 of 79 Read Measurin
g Value Block
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)
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01-91

Function test: Red brake warning symbol
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
20

Continuation: Function of red
"brake system
malfunction"
symbol - For vehicles with
automatic transmission and
high-line instrument cluster,
depress the brake pedal
and select a driving gear. The ABS/EDL indicator
lamp and the red "brake
system malfunction"
symbol light up. If the
traction control indicator
light is installed and OK, it
also lights up. Repair Manual,
Electrical Equipment, Repair Group 90; Instrument cluster
- Malfunction in
instrument cluster
Pa
ge 46 of 79 Read Measurin
g Value Block
(function 08
)
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01-92

Function test: Traction control indicator light -K86-. This is only installed if vehicle is equipped with ASR.
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective
action
21 - Function of traction
control indicator light -
K86- DTC memory checked and no DTC
present in DTC memory of ABS control
module -J104-. Ignition switched off Multi-pin connector connected to ABS
control module -J104- and retainer catch
engaged.
Test step 21: Continued on
next page.
Pa
ge 47 of 79 Read Measurin
g Value Block
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-93

Function test: Traction control indicator light -K86-. This is only installed if vehicle is equipped with ASR.
Test step
VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
21

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 lamp
remains continuously lit, check wire
from terminal 31 of ABS control
module -J104- to instrument cluster for
short circuit to Ground (GND).

Repair Manual, Electrical
Equipment, Repair Group 90; Instrument cluster
- Are both the vehicle voltage and the
wiring from terminal 31 of ABS control
module -J104- to the instrument
cluster OK? Malfunction in
instrument cluster.
Pa
ge 48 of 79 Read Measurin
g Value Block
(function 08
)
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pair&id=AUDI.B5.SU02.01.8

01-94

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
22 - Function of
traction control
button Ignition switched off Function of traction control
indicator light -K86- was
already checked in step 21. Multi-pin connector connected
to ABS control module -J104-
and retainer catch engaged.
- Switch on ignition

- Press traction control buttonTraction control
indicator light -
K86- lights up - Switch off ignition.
- Detach multi-pin
connector from ABS control
module -J104- and remove.

- Press traction control button
again Traction control
indicator light -
K86- goes out. - Connect VAG1598/20 test
box.
Test step 22: Continued on next page.
Pa
ge 49 of 79 Read Measurin
g Value Block
(function 08
)
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01-95

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
22 28 + 44 Function of
traction control
button Ignition switched
on.
Continuation:
- Traction control
button not pressed 0.0 to 0.5
V

- Traction control
button pressed 10.0 to 14.5
V
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check wire from terminal 28 to
Ground (GND).
- Check wire from terminal 44 to
traction control button, terminal 6.
- Check voltage supply from terminal 5
of traction control button to terminal 15.
- If no malfunctions can be found using
the procedures in these steps, replace
the traction control button.
Pa
ge 50 of 79 Read Measurin
g Value Block
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-114

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00642
Right front traction
control switch-over
valve -N166-
Open circuit, short circuit to B+ or Ground (GND)
in wiring between ABS hydraulic unit -N55- and
ABS control module -J104-.
Right front traction control switch-over valve -
N166- malfunctioning. - Carry out "electrical test", steps 5 +18
page 01
-68
.
- If the electrical test does not reveal any
malfunctions, check all wiring and
connectors for loose contacts.
- If no problems are found after
implementing the specified steps, replace
the control module.
00643
Right front traction
control outlet valve -
N167-
Open circuit, short circuit to B+ or Ground (GND)
in wiring between ABS hydraulic unit -N55- and
ABS control module -J104-.
Right front traction control outlet valve -N167-
malfunctioning. - Carry out "electrical test", steps 6 +18
page 01
-68
.
- If the electrical test does not reveal any
malfunctions, check all wiring and
connectors for loose contacts.
- If no problems are found after
implementing the specified steps, replace
the control module.
Pa
ge 73 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8