AUDI A4 1998 B5 / 1.G Brakes ESP Electrical Testing Owner's Manual

01-320

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
6 52 + 54

High pressure switch
valve -1- traction control
-N227-


W
16
- Check electrical wiring for short
circuit to Ground (GND) or B+.


High pressure switch
valve -2- traction control
-N228- Electrical Wiring Diagrams,
Troubleshooting & Component
Locations
- If the electrical wiring is OK,
replace the hydraulic unit.
7
8 + 10
1)
9 + 10 2) Left front ABS wheel speed
sensor -G47-
400
2300
- An infinitely high resistance
indicates an open circuit. Check for
this.
Outlets on ABS control module -J104- differ depending on installed equipment
1) Vehicles with all-wheel-drive
Pa
ge 21 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

2) Vehicles with front-wheel-drive
Pa
ge 22 of 65 Electronic Stabilization Pro
gram
(ESP
), electrical testin
g
11/20/2002 htt
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yp
e=re
pair&id=AUDI.B5.SU02.01.16

01-321

Resistance measurement: Select measurement range on VAG1526 (2k or 20 k )





Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified
value Corrective action
8 15 + 16 Right front ABS
wheel speed
sensor -G45-
- A resistance less than the specified value
indicates a short circuit between both lines.
Check for this.
9 13 + 14 Left rear ABS
wheel speed
sensor -G46-
400
2300
- Check electrical wiring for short circuit to
Ground (GND) or B+.
10 11 + 12 Right rear ABS
wheel speed
sensor -G44- Electrical Wiring Diagrams,
Troubleshooting & Component Locations - If the electrical wiring is OK, replace the
relevant ABS wheel speed sensor.
Pa
ge 23 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

01-322

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
11
2 + 37
1)
2 + 36 2) Activation of ABS
solenoid valve relay -
J106-
- An infinitely high resistance indicates
an open circuit.
- A resistance less than the specified
value indicates a short circuit between
both lines.
12 2 + 7 Activation of ABS
return flow pump relay
-J105-
0W
70

Electrical Wiring Diagrams,
Troubleshooting & Component Locations
- Check electrical wiring for short circuit
to Ground (GND) or B+. - If the electrical wiring is OK, replace
the relay.
Outlets on ABS control module -J104- differ depending on installed equipment
1) Vehicles with control module 4B0 907 389 2) Vehicles with control module 8D0 907 389/A/D/E
Pa
ge 24 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

01-323
Electrical test; steps 13-27

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
13
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N101
and front left
brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 5 +
28
- Depress brake pedal
and hold.
Left front
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians.
Pa
ge 25 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

2) Vehicles with control module 4B0 907 389 3) Vehicles with control module 8D0 907 389/A/D/E
Pa
ge 26 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

01-324
Continuation: Function test
Test
step VAG
1598/20
sockets Test of
Test
requirements
- Additional work
steps Specified value
Corrective action
13
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N101 and
front left brake line
connection
- If all wheels are blocked, inlet
valve is malfunctioning DTC
table, DTC 00257.

- Remove bridge
The left-front
wheel remains
locked.

- Release brake
pedal.
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians. 2) Vehicles with control module 4B0 907 389
Pa
ge 27 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

3) Vehicles with control module 8D0 907 389/A/D/E
Pa
ge 28 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

01-325

Function test
Test
step VAG
1598/20
sockets Test of
Test requirements
- Additional work stepsSpecified
value Corrective action
14
1)
Bridge
1 + 2,
28+37
2)
28+36 3) Inlet valve -N99-
and front right
brake line
connection
Ignition on

- for vehicles with
automatic transmission,
engage neutral position
"N"
- Bridge terminals 26 +
28
- Depress brake pedal
and hold.
Right front
wheel can
be rotated
by hand - If the wheel does not rotate, check the
other wheels for free rotation. If yes, then
hydraulic brake lines are mixed-up
(switched). Check brake line connections
and coupling pieces. Make sure every
component is OK.

See continuation on next page
Outlets on ABS control module -J104- differ depending on installed equipment
1) This test step requires two technicians. 2) Vehicles with control module 4B0 907 389
Pa
ge 29 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

3) Vehicles with control module 8D0 907 389/A/D/E
Pa
ge 30 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