wheel AUDI A4 2000 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

01-221

Examples:

During oversteering, the rear of the vehicle breaks out toward the outside
of the curve. The vehicle rotates more on its vertical axis than required to
maneuver through the curve. Braking the outside front wheel counters the
oversteering effect.

In understeering, it is the front of the vehicle that does not follow the
curve. The front of the vehicle breaks out. The vehicle rotates less on its
vertical axis than is required to maneuver through the curve. By braking
the rear inside wheel, the braking force generated intensifies the rotational
movement of the vehicle.
Component locations (except for new components) are the same as for
the Bosch 5.3 components. The procedures for removal and installation of
the components are found in:
Repair manual, Brake System, Repair Group 45

Pa
ge 5 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

01-228

"Brake
malfunction"
symbol ABS/EDL
warning
light
-K47- Traction
control
indicator
light
-K86- Possible reasons why the indicator lamps light up
on on on The ABS and traction control indicator lights go on, and three seconds after
the ignition is switched on the red "brake system malfunction" symbol goes
on.
WARNING!
The brake system is only partially functional. Because brake pressure at
the rear wheels is no longer regulated vie Electronic Brake Distribution
(EBD), the rear wheels can lock even during light braking (excessive
braking at rear axle). This can cause the rear of the vehicle to break
loose and thereby cause and accident.
Note: For vehicles with automatic transmission, the red "brake system
malfunction" symbol does not appear immediately after the ignition is
switched on. Instead, the note "Depress brake pedal before engaging gear"
appears in the display. Press the brake pedal and select a gear. The red
brake warning light appears, if the light control is working properly.
A malfunction deactivated the ABS/EDL, ASR/ESP and the "Electronic
Brake Distribution" (EBD).Check DTC memory page 01
-356
. Pa
ge 14 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

01-233
Control module versions System identification
Prod.
No.:
1) Control
module part
no.: Index
Coding
Data
transmission
via: CAN terminal resistance
in control module:
All Wheel Drive (AWD);
ABS/ESP 1AT: 4B0 907 389 - coding not
possible CAN-bus
120
Front Wheel Drive
(FWD); ABS/ESP 1AT: 8D0 907 389 - Can be
coded CAN-bus
120 All Wheel Drive (AWD);
ABS/ESP 1AT: 8D0 907 389 A Can be
coded CAN-bus
120 Front Wheel Drive
(FWD); ABS/ESP 1AT: 8D0 907 389 D Can be
coded CAN-bus
2600 All Wheel Drive (AWD);
ABS/ESP 1AT: 8D0 907 389 E Can be
coded CAN-bus
2600 1) This letter code is the production number allocated to each equipment version. The production number can be derived from
the vehicle data plate. The vehicle data plate is attached to the vehicle in the spare tire well.
Pa
ge 19 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