brake sensor VOLKSWAGEN JETTA 1998 Workshop Manual

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Overview of selectable display group numbers
Display group number
Display zone
Designation
001 1 Wheel speed at left front wheel sensor (km/h)
2 Wheel speed at right front wheel sensor (km/h)
3 Wheel speed at left rear speed sensor (km/h)
4 Wheel speed at right rear speed sensor (km/h)
002 1 Wheel speed at left front speed sensor (km/h)
2 Wheel speed at right front wheel sensor (km/h)
3 Wheel speed at left rear speed sensor (km/h)
4 Wheel speed at right rear speed sensor (km/h)
003 1 Brake light switch
2 Brake system warning light
3 ABS warning light
4 ASR/ESP warning light
Стр. 84из 129 On Board Diagnostic (OBD), performing

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Display group number
Display zone
Designation
004 1 Steering angle sensor
2 Lateral accelerator sensor
3 Sender for rotation rate
4 Vacant
005 1 Brake pressure sensor
2 Vacant
3 Vacant
4 Vacant
Стр. 85из 129 On Board Diagnostic (OBD), performing

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Checking sensor for transverse acceleration -
G200-
1)

- Remove sensor for transverse acceleration -
G200-. When doing this, do not pull connector
off sensor for transverse acceleration -G200-.
Repair Manual, Brake System, Repair Group
45; Removing and installing parts of ESP system

Note:
All functions that have so far been carried out
with V.A.G 1551 can now also be carried out with
the tester VAS 5051.

- Connect V.A.G. 1551 scan tool.
The sensor for transverse acceleration -G200-
can be checked with the help of function "Read
measured value block", display group 005.
Read measured value block
4
1 2 3
- There are always 3 display zones -arrows-.
Display zone 2 displays the value for the sensor
for transverse acceleration -G200-.
Read measured value block
4
0.0 0.0m/s2- 1.26/s
Indicated on display: e.g. (vehicle stationary)
1) For ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP
4MOTION only
Стр. 95из 129 On Board Diagnostic (OBD), performing

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Checking brake pressure sensor 1)

Display group number 005

- Press keys 0, 0 and 5

- Confirm entry with key Q.
Read measured value block
5
1 2 3 4
- There are always 4 display zones -
arrows- in the measured value block.
Decoding the individual values in display
zones 1 to 4 can be read-off from the
following tables.
Read measured value block
5
- 1.06 bar
Indicated on display: e.g. (vehicle
stationary)
Press C key for the next display group
number entry.
If the key is pressed, keys 0 and 8 for
work sequence "Read measured value
block" must be pressed again afterwards to
regain entry.
1) For ABS/EDL/ASR/ESP and
ABS/EDL/ASR/ESP 4MOTION only
Стр. 97из 129 On Board Diagnostic (OBD), performing

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Read measured value block
5 Display group number: 005
-1.06 bar
Indicated on display (example)

Vacant

Vacant

Vacant

Brake pressure sensor
Specification when brake pedal is not depressed: 7 bar
Perform electrical check from Page 01-288
Стр. 98из 129 On Board Diagnostic (OBD), performing

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Checking longitudinal acceleration sensor -
G251-
1)

- Remove longitudinal acceleration sensor -G251-
without pulling off connector.
Repair Manual, Brake System, Repair Group
45

Note:
All functions that have so far been carried out
with V.A.G 1551 can now also be carried out with
the tester VAS 5051.

- Connect V.A.G. 1551 scan tool.
The longitudinal acceleration sensor -G251- can
be checked with the help of function "Read
measured value block", display group 006.
Read measured value block
6
1 2 3 4
- There are always 4 display zones -arrows- in the
measured value block. Decoding the individual
values in display zones 1 to 4 can be read-off
from the following tables.
Read measured value block
6
0.0m/s2
Indicated on display: e.g. (vehicle stationary)
1) For 4MOTION vehicles only
Стр. 101из 129 On Board Diagnostic (OBD), performing

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Basic setting, initiating
Function 04 "Initiate basic setting" performs
several functions with ABS Mark 60:

Display group number 001 is required only to
bleed the hydraulic system Page 01
-266

Note:
The basic setting is only necessary to bleed the
hydraulic unit if at least one chamber of the brake
fluid reservoir has completely run dry.

Display group number 0401) is required to shut
off the longitudinal acceleration sensor -G251-
in order to utilize the maximum engine
performance for a test, e.g. on a rolling road
test stand Page 01
-269 .
Display group number 0602) is required to
perform a zero compensation for steering angle
sensor -G85- Page 01
-271 . Subsequently a
test drive must be performed Page 01
-284 .
Display group number 0632) is required to
perform a zero compensation for sensor for
transverse acceleration -G200- Page 01
-
275 . Subsequently a test drive must be
performed Page 01
-284 .
Display group number 0662) is required to
perform a zero compensation for Sender 1 for
brake booster -G201- Page 01
-278 .
Subsequently a test drive must be performed
Page 01
-284 .
Стр. 106из 129 On Board Diagnostic (OBD), performing

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Display group number 0691) is required to
perform a zero compensation of longitudinal
acceleration sensor -G251- Page 01
-281 .
Display group number 0932) is required to
perform a driving test Page 01
-284. It serves
to check the plausibility of the signals from the
steering angle sensor -G85-, Sensor for
transverse acceleration -G200- Sender for
Rotation Rate -G202- and sender 1 for brake
booster -G201-.
When the ABS control module (w/EDL) -J104- is
replaced, a zero compensation must be
performed for the following components:

Sensor for transverse acceleration -G200-.

Steering angle sensor -G85-.

Sender 1 for brake booster -G201-.

Longitudinal acceleration sensor -G251-.1)
When the individual sensors or sensors are
changed, a zero compensation must only be
carried out for the changed component.

1) For 4MOTION vehicles only

2) For ABS/EDL/ASR/ESP and
ABS/EDL/ASR/ESP 4MOTION only
Стр. 107из 129 On Board Diagnostic (OBD), performing

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Display group number 40: switching off
longitudinal acceleration sensor -G251-

All functions which could previously be
performed with V.A.G 1551 can now also be
carried out with the tester VAS 5051.

Display group 040 is necessary for shutting off
longitudinal acceleration sensor -G251- in order
to utilize the maximum engine performance for
a test, e.g. on a rolling road test bed. In
addition, the all wheel drive is shut off and the
vehicle behaves like a front wheel drive vehicle.

Switch ignition off and on again to reactivate the
longitudinal acceleration sensor -G251-.

- Connect V.A.G 1551 scan tool and select
(address word 03) brake electronics control
module with ignition switched on; Page 01
-
163 .
Стр. 111из 129 On Board Diagnostic (OBD), performing

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Display group number 60: zero compensation
of steering angle sensor -G85-

Note:

All functions which could previously be
performed with V.A.G 1551 can now also be
carried out with the tester VAS 5051.

- Connect V.A.G 1551 scan tool and select
(address word 03) brake electronics control
module with ignition switched on; Page 01
-
163 .

- Start engine.

- Carry out a short test drive over a flat and level
surface. Drive straight-ahead and not faster then
20 km/h (12.5 mph) and observe the following
points:

If the steering wheel is not in the centered
position when driving straight ahead, the
steering must be corrected within the
framework of an alignment check.
Repair Manual, Suspension, Wheels,
Steering, Repair Group 44; Vehicle alignment.
Стр. 113из 129 On Board Diagnostic (OBD), performing