sensor AUDI A4 1998 B5 / 1.G Brakes Basic Setting 04 Workshop Manual

01-242


Basic setting (scan tool
function 04)
Initiating "Basic Setting" function 04 does the
following for ESP:

The steering angle sensor -G85- is zeroed
using display group 001 page 01
-243

Before you can zero the sensor, you must have
successfully carried out the "Login Procedure"
function 11 using the VAG1551/1552 scan tool
and the ABS control module -J104- must be
coded page 01
-234
.

The hydraulic pump for traction control -
V156- is activated using display group 002
Activation of the hydraulic pump for traction
control -V156- does not require any preparations.
It is used to bleed the hydraulic system page
01
-248
.

The ESP driving test is activated using
display group 003
The ESP driving test is used to test the
plausibility of the signals from the sensor for
transverse acceleration, yaw sensor and
pressure sensor page 01
-250
.
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01-243

Steering angle sensor -G85-, zeroing
procedure


- Now it is necessary to perform the zeroing
procedure on the steering angle sensor -G85-.

- To initialize the steering angle sensor, turn the
steering angle at least 10 degrees in either
direction

- Move steering to zero position, maximum
tolerance is 5 degrees.
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01-244

Note:
The diagnostic must not be exited and ignition
must not be switched off between the procedures
"Code control module" and "Steering angle
sensor calibration". Otherwise, the entire
procedure must be repeated. Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press the -1- button twice to select the function "login procedure".
Rapid data transfer
Q
11 - Lo
gin procedure

Indicated on display:
- Press -Q- button to confirm input.
Login procedure
Q
Enter code numbers XXXXX

Indicated on display:
- Select code number 40168. Press -Q- button to confirm input.
Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -4- to select function 04 "Basic Setting"
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01-250

ESP driving and system test

The ESP driving test is used to test the
plausibility of the signals from the sensor for
transverse acceleration, yaw sensor, and
pressure sensor.

Road test vehicle
Some DTCs are only recognized by the On
Board Diagnostic (OBD)while the vehicle is
moving. You can check the entire system during
a road test. During road test, drive at a speed of
at least 60 km/h for 30 seconds. Check traffic
conditions and perform an ABS regulated braking
when appropriate. You will feel a pulsing in the
brake pedal indicating the system is active.

Note:
Once the ESP driving test has been initiated, it
cannot be aborted and must be performed
completely. After exiting the diagnostic, the
ABS/EDL and ASR/ESP lamps remain switched
on in order to indicate that the test is active and
that system function is not available yet.
Warning, ABS and ESP not functioning!
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01-256

Read Measuring Value Block (function
08)

The control module can transmit measured
values to the VAS5051 tester and VAG1551
Scan Tool (ST). These measured values provide
information about the operational status of the
system and the sensors connected to it. In many
cases the data supplied can be used to
troubleshoot and repair malfunctions. The
measured values provided by ESP are contained
in six display groups, which can be accessed via
their display group numbers.

- Connect the VAS5051 tester or VAG1551 Scan
Tool (ST) and select the address word 03 "Brake
Electronics".
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01-258
Test table: display group 1
Notes:

Display fields 1 through 4 show the current wheel circumference speeds in km/h. These are calculated by the ABS control
module -J104- on the basis of the signals received from the wheel speed sensors. If one of the display fields shows no
reading, proceed as for DTCs 00283, 00285, 00287, 00290 "ABS Wheel Speed Sensor" DTC table page 01
-357
.
In order to check whether wheel speed sensors are properly allocated to each wheel, the vehicle must be raised. On
vehicles with manual transmission put the gear shift lever in neutral. On vehicles with automatic transmission move the
selector lever to position "N". Turn appropriate wheel by hand. Remaining drive wheels must be secured against turning.
When a vehicle is accelerated uniformly on a dry surface, the displayed value will increase continuously by whole
numbers; e.g. 6 km/h, 7 km/h, 8 km/h ... . The difference between displayed values 1-4 should not be more than 1 km/h
(error from out-of-round wheels). If the values jump, for instance from ...6km/h, 7 km/h, to 12 km/h...or if the difference
between the displayed values is greater than 1 km/h, then check the installation of the wheel speed sensors and rotors. Repair Manual, Brake System, Repair Group 45

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01-270
Test table: display group 5 Read measuring value
block 5
Indicated on display
- 720
...
+720
- 69
/s ...
+ 69 /s
- 41
bar ...
+292
bar - 25 m/s2 ...
+ 25 m/s2


Transverse acceleration:

Specification with vehicle at standstill: 0....0.7 m/s2 Specification with steering wheel fully turned at a speed of 20 km/h: max. 6.0 m/s2; the
value of the measured value increases steadily. Another test for the sensor is located page 01
-271
; Fig. 1
.

Brake pressure:

Specification with brake pedal not depressed: 0....5 bar

Rotation rate:
Specification with vehicle at standstill: 3 /sSpecification with steering wheel fully turned at a vehicle speed of 20 km/h: max. 65 /s; the value of the
measured value increases steadily.
Steering angle:

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Specified value when driving straight ahead (steering wheel in straight-ahead position) 5 .
1)
1) If the steering angle sensor is OK, there will be an indication, even if the zeroing procedure was not performed.
Note:
On Board Diagnostic (OBD) will be terminated by the ABS control module -J104- if road speed exceeds 19 km/h.
If nothing is displayed, press -C- button, select function 02 and check DTC memory. Repair the malfunction with the
help of the DTC table page 01
-356
.
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Note:
The transverse acceleration sensor is very
impact-sensitive, as is the combined sensor for
yaw rate and transverse acceleration. If one of
these sensors is dropped, do not reinstall it in
vehicle under ANY circumstances. Instead, use a
new sensor.

Fig. 1 Sensor for transverse acceleration -G200-
In order to test the sensor, or the combined sensor for yaw rate and
transverse acceleration, the sensor must be removed. Remove rear
seat bench. Unscrew control module for ultra-sound sensors -J347-
and then the sensor. Leave the sensor connected and turn it 90
relative to installation position along its longitudinal axis.
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After this, a value of either - 9,8 1 m/s2 or
+ 9,8 1 m/s2 will be indicated on the scan
tool display in display group 5 (use the "Read
measuring value block" function).
A plus in front of the number indicates the
affect on the sensor while driving around a
left-hand curve.

A minus in front of the number indicates the
affect on the sensor while driving around a
right-hand curve.

After reinstalling the sensor for transverse
acceleration -G200- or the combined sensor
for yaw rate and transverse acceleration,
tighten the mounting bolts to 5 Nm. Tighten
the mounting bolts for the control module for
ultra-sound sensors -J347- to 2 Nm.

Note:
Due to an error in the test card 8.0 for the
VAG1551 scan tool and the test card 5.0 for the
VAG1552 scan tool, the display for Measuring
Value Block 5, display group 4 is offset by one
decimal point. This means, for example, that a
transverse acceleration value of 9.81m/s2 is
displayed simply as 0.98 m/s2 .
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