traction control AUDI A4 1995 B5 / 1.G Brakes Read Mesure Value Block Workshop Manual

01-67
Test table: display group 3 Read measuring value block
3
Indicated on display
60 to
8000
1 RPM 0 to
100
%
0 or 1
---


Traction control (ASR) button: (Only for vehicles equipped with ASR)

0 Traction control button not operated. 1 The traction control button is operated, operational condition of ASR alternates, i.e. "ASR
OFF" and "ASR ON". When ASR is switched off via the traction control button, the warning lamp for ASR lights up.
- Check traction control button if there are deviations. Carry out "Electrical test", step 22 page 01
-
68
.

Actual engine torque (AET): (Only for vehicles equipped with ASR)
0% vehicle is in deceleration mode.20% - 30% represents engine idle.100% engine is offering its maximum torque.
- If no indication is displayed, proceed according to DTC 00647 "ABS-ASR engine electrical connection 2". DTC
table page 01
-98
.
Engine speed: (Only for vehicles equipped with ASR)

Engine speed is displayed in increments of 60 RPM, starting at 60 RPM.
Pa
ge 9 of 79 Read Measurin
g Value Block
(function 08
)
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01-72
Terminal assignment of multi-pin connector for wiring harness / ABS control module (w/EDL) -J104- Terminal
Wire connection to component ...
1
Voltage supply, terminal 15 2
Hydraulic unit; activation of ABS return flow pump relay -J105- 3
Hydraulic unit; left front traction control switch-over valve -N168- (secondary piston circuit) 4
Hydraulic unit; left front traction control outlet valve -N169- (secondary piston circuit) 5
Hydraulic unit; left front ABS inlet valve -N101- 6
Hydraulic unit; right rear ABS inlet valve -N133- 7
Hydraulic unit; activation of ABS return flow pump relay -J105- 9
Left front ABS wheel speed sensor -G47-
for vehicles with Front Wheel Drive (FWD) and ABS/EDLfor vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
10
Left front ABS wheel speed sensor -G47- 11
Right rear ABS wheel speed sensor -G44- 12
Left rear ABS wheel speed sensor -G46- 13
Left rear ABS wheel speed sensor -G46- 14
Right front ABS wheel speed sensor -G45- 15
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS
Pa
ge 15 of 79 Read Measurin
g Value Block
(function 08
)
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01-73

Terminal
Wire connection to component ...
18
Engine Control Module (ECM); MMD signal (Masked Misfire Diagnostic)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR, the SET signal (Specified Engine Torque) is
also transmitted via this wiring harness.
19
Hydraulic unit; control wire for ABS return flow pump -V39- 20
Engine Control Module (ECM); Engine RPM
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
25
Hydraulic unit; Left rear ABS outlet valve -N136- 26
Hydraulic unit; Right front ABS outlet valve -N100- 27
Hydraulic unit; right front traction control outlet valve -N167- (primary piston circuit) 28
Ground (GND) terminal 31 (ABS control module -J104-) 29
Ground (GND) terminal 31 (ABS control module -J104-) 31
Instrument cluster; activation of traction control indicator light
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
32
Instrument cluster; ABS/EDL warning light activation (active) 33
Hydraulic unit; Left front ABS outlet valve -N102- 34
Hydraulic unit; Right rear ABS outlet valve -N135- 35
Left front ABS wheel speed sensor -G47-
for vehicles with All Wheel Drive (AWD) and ABS/EDL
Pa
ge 17 of 79 Read Measurin
g Value Block
(function 08
)
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01-74

Terminal
Wire connection to component ...
37
Hydraulic unit; activation of ABS solenoid valve relay -J106- 38
Right rear ABS wheel speed sensor -G44- 42
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR for vehicles with All Wheel Drive (AWD) and ABS/EDL (throttle valve regulation)
44
Traction control (ASR) button
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
45
TI (Transmission Influence)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
46
K-wire 47
Engine Control Module (ECM); AET (Actual Engine Torque)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
47
Brake light switch -F-
for vehicles with All Wheel Drive (AWD) and ABS/EDL
48
Brake light switch -F- 50
Battery + (terminal 30) 53
Hydraulic unit; left rear ABS inlet valve -N134-
Pa
ge 19 of 79 Read Measurin
g Value Block
(function 08
)
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54
Hydraulic unit; right front ABS inlet valve -N99- 55
Hydraulic unit; right front traction control switch-over valve -N166- (primary piston circuit)
Pa
ge 20 of 79 Read Measurin
g Value Block
(function 08
)
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01-77

Resistance measurement: Select measurement range on VAG1526 (200 )
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work steps Specified
value Corrective action
5
Note:
Only for
vehicles with
ABS/EDL or
ASR 3 + 55 Left front traction
control switch-over
valve -N168-
(secondary piston
circuit)
Right front traction
control switch-over
valve -N166- (primary
piston circuit) Electrical wiring
between control
module and hydraulic
unit OK 12
28
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check electrical wiring
between control module and
hydraulic unit for short circuit
to Ground (GND) or B+. - If the electrical wiring is OK,
replace the hydraulic unit.
6
Note:
Only for
vehicles with
ABS/EDL or
ASR 4 + 27 Left front traction
control outlet valve -
N169- (secondary
piston circuit)
Right front traction
control outlet valve -
N167- (primary piston
circuit)
Electrical wiring
between control
module and hydraulic
unit OK 12
28
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check electrical wiring
between control module and
hydraulic unit for short circuit
to Ground (GND) or B+. - If the electrical wiring is OK,
replace the hydraulic unit.
Pa
ge 23 of 79 Read Measurin
g Value Block
(function 08
)
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01-84

Function test and check for proper seal
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified value
Corrective action
17 Bridge
1 + 2,
7 + 37,
37 + 28
ABS return
flow pump -
V39-
Left front
traction
control
switch-over
valve -N168-
Left front
traction
control outlet
valve -N169- Repair Manual,
Brake System, Repair Group 47
- Connect VAG1310A
pressure gauge to front
left brake caliper and
bleed.
- Bridge terminals 3 +
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-
Left front ABS
outlet valve -
N102- - Switch on ignition for
max. 10 seconds and
switch off again.
Left front
traction control
switch-over
valve -N168-
switched ABS return
flow pump -
V39- runs Pressure on
pressure - Check left front traction control
switch-over valve -N168- and left
front traction control outlet valve -
N169- via resistance test test steps
5 + 6. Replace ABS hydraulic unit -
N55- if malfunctioning.
Pa
ge 35 of 79 Read Measurin
g Value Block
(function 08
)
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01-85

Function test and check for proper seal
Test step
VAG
1598/20
sockets Test of
Test requirements
- Additional work
steps Specified value
Corrective action
17

Continuation:

Right rear
ABS
outlet
valve -
N135- - Bridge terminals 4 +
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
Left front
traction control
outlet valve -
N169- switchedPressure
increases on
pressure
gauge:
- Pressure relief valve and/or left
front ABS outlet valve -N102-
and/or right rear ABS outlet valve
-N135- 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 37 of 79 Read Measurin
g Value Block
(function 08
)
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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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pair&id=AUDI.B5.SU02.01.8

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
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8