brake sensor AUDI A4 1995 B5 / 1.G Brakes ESP Bosch 5.3 Workshop Manual

01-218

ESP system sensors and components,
description


Control module for ABS with EDL/ASR/ESP -
J104-
The control module is combined with the
hydraulic unit as one unit. It controls the ESP,
ABS, EDL, ASR, EBD and ETR (Engine Torque
Reduction) functions. When ignition is switched
on, the control module performs a self-test. All
electrical connections are monitored constantly
and the solenoid valves are periodically checked
for function. If the control module fails entirely,
only the normal brake system will be available.

Steering angle sensor -G85-
The steering angle sensor is housed together
with the airbag spiral spring/return spring with
slip ring. It is located on the steering column
between the steering column switch and steering
wheel. It transmits the steering wheel's steering
angle to the ABS control module -J104 for
ABS/ASR/ESP via the CAN-bus. After replacing
the control module or the sensor, a zeroing must
be performed. For malfunctioning sensor, the
ESP function is not available.
Pa
ge 2 of 27 Electronic Stabilization Pro
gram
(ESP
) Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.14

01-219

Sensor for transverse acceleration -G200-
The sensor for transverse acceleration transmits
the values of lateral acceleration (cornering
force) to the ABS control module -J104 for
ABS/ASR/ESP. After replacing the control
module or the sensor, a zeroing must be
performed. For malfunctioning sensor, the ESP
function is not available.

Sender for rotation rate -G202-
The sender for rotation rate collects data, so-
called yaw moments or rotation rates, that
attempt to spin the vehicle on the vertical axis
and it sends these to control module -J104- for
ABS/ASR/ESP. For malfunctioning sensor, the
ESP function is not available.

Sender 1 for brake booster -G201-
The brake pedal position sensor recognizes the
current brake pressure in the brake circuit and
sends this data to the ABS control module
(w/EDL) -J104-. From this, the control module
calculates the wheel braking powers and
therefore the vertical forces affecting the vehicle.
If the sensor fails, the ESP function is not
available.
Pa
ge 3 of 27 Electronic Stabilization Pro
gram
(ESP
) Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.14

01-225

"Brake
malfunction"
symbol ABS/EDL
warning
light
-K47- Traction
control
indicator light
-K86- Possible reasons why the indicator lamps light up
off off off

There is an irregularity. The indicator lamps go on during the self-
test and then go out. The possible causes are as follows: The voltage supply for the ABS control module -J104- is between
7 and 10 volts and the vehicle speed is < 6 km/h. Carry out
"Electrical test", step 21. The DTC "01119 gear recognition signal" is stored in the DTC
memory. Check DTC memory page 01
-356
.
The signal indicating whether the parking brake is set or released
is not being sent to the ABS control module -J104-. "Read
measuring value block" function 08 page 01
-256
, display group
2 page 01
-261
.
Check the brake light switch -F-. "Read measuring value block"
function 08 page 01
-256
, display group 2 page 01
-261
.
Check the zero position of the steering angle sensor -G85-. "Read
measuring value block" function 08 page 01
-256
, display group
5 page 01
-270
.
Pa
ge 11 of 27 Electronic Stabilization Pro
gram
(ESP
) Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.14

01-226

"Brake
malfunction"
symbol ABS/EDL
warning
light
-K47- Traction
control
indicator
light
-K86- Possible reasons why the indicator lamps light up
off on on
Also observe notes on the next page.
The indicator lights did not go out after the self-test. However, the red
"brake system malfunction" symbol did not go on. The On Board
Diagnostic recognized a malfunction, which deactivated the
ABS/EDL/ASR/ESP. However, the "Electronic Brake Distribution" (EBD)
remained activated. Check DTC memory page 01
-356
.
The ESP driving test may have been activated page 01
-250
Check the voltage supply for the red "brake system malfunction" symbol.
Carry out "Electrical test", step 18. If the control is malfunctioning, see
the next example for lighted indicator lights. During the last drive, a dynamic malfunction of the wheel speed sensor
occurred or a malfunction in the ABS return flow pump -V39- occurred.
In this case, the indicator lights automatically go off after the vehicle is
started, and has exceeded a speed of 2.75 km/h or a check of the return
flow pump indicated it is OK.
Pa
ge 12 of 27 Electronic Stabilization Pro
gram
(ESP
) Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.14