warning AUDI A4 1999 B5 / 1.G Brakes Basic Setting 04 Workshop Manual

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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01-251

WARNING!

While system is in diagnostic, the
ABS/ESP/EBD is not active. Driving the
vehicle after On Board Diagnostic (OBD) has
detected a malfunction presents the risk of
accident. The brake system will only be
partially functional. Because brake pressure
at the rear wheels is no longer regulated vie
Electronic Brake Distribution (EBD), the rear
wheels tend to brake excessively. This
causes the rear of the vehicle to break loose.

When the use of test equipment is required
during road tests, test equipment must
always be secured to the rear seat and
operated from there by a second person. If
test and measuring equipment is operated
from the passenger seat, the person seated
there could be injured in the event of an
accident involving deployment of the
passenger-side airbag.
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01-252

- Connect VAS5051 tester or VAG1551 scan tool
and select the address word 03 "Brake
Electronics" page 01
-4
Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -4- to select function 04 "Basic Setting"
Rapid data transfer
Q
04 - Basic Settin
g

Indicated on display:
- Press -Q- button to confirm input.
Basic Setting
Q
Enter displa
y group number XXX

Indicated on display:
- Press buttons -0-, -0-, and -3-. Press -Q- button to confirm input.
System in basic setting
3
System test activated
OK

Indicated on display:
The ESP driving test is activated.
The ABS warning light -K47- and the traction control indicator light -
K86- go on.
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01-253

- Press buttons -0- and -6- to select "End Output"
function 06. Press -Q- button to confirm input. Rapid data transfer
HELP
Select function XX

Indicated on display:
Note:
This completes the adjustment with the engine not running
WARNING!
Always follow the rules of the road and pay attention to traffic
conditions as your first priority. - Disconnect VAG 1551 scan tool.
- Start engine.
- Press the brake pedal hard (brake pressure higher than 35 bar) until
the traction control indicator light -K86- turns off.
- Perform the following road test:
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01-254

Make a right or left turn. Then reverse the
direction and continue driving until the
ABS/EDL lamp turns off.

Note:
While driving around the curves, a yaw rate of
around 10 /sec must be obtained. A curve with
a radius of 10 to 12 m and a speed of 15 to 20
km/h for around 4 sec. fulfills this requirement.

The ABS warning light -K47- must go out. This
completes the ESP driving test and the system
is OK.

If the ABS/ESP warning light -K47- remains lit,
the test is not OK (system locked). Check DTC
memory.
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01-255

If the ABS warning light -K47- does not go out,
the ESP driving test was not performed properly.

If the ABS warning light -K47- does not go out,
and the traction control indicator light -K86-
lights up again, there are malfunctions in the
system; Check DTC memory page 01
-356


Note:
If the ESP driving test was interrupted, e.g.: by
switching off the ignition, the entire test must be
repeated.
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01-261
Test table: display group 2 Read measuring value block
2
Indicated on display

0 or
operated 0 or
operated
0 or
operated 0 or
operated


Traction control button
0 Traction control button not operated Traction control switch operated
- Check traction control button if there are deviations. Carry out "Electrical test", step 20.

Parking brake

0 Parking brake not engaged Parking brake engaged
- Check parking brake warning light switch -F9- if
there are deviations. Carry out "Electrical test", step
27.

Brake light switch:
0 Brake pedal not depressedBrake pedal depressed- Check brake light switch if there are deviations. DTC table page
01
-356
; DTC "Brake light switch -F-"; DTC 00526.
Brake test switch:

0 Brake pedal not
depressed Brake pedal depressed
- The brake test signal precedes the brake light signal. Check brake light switch if there
are deviations:DTC table page 01
-356
; DTC "Brake light switch -F-"; DTC 00526.
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01-281

Notes:

The vehicle must be raised until all wheels are
free to turn. Ask a colleague to help. The
colleague will have to check the wheels to
determine whether they turn freely.
You can stop the test sequence at any time by
pressing the -C- button.
To avoid overloading the components being
checked, they are actuated during the test
sequence for a period of 60 (or 90) seconds.
The actuator test will be terminated if the "
button" is not pressed within this period.

The ABS warning light and the red "brake
system malfunction" symbol blink during the
test.
Pressing the brake pedal repeatedly this
relieves the vacuum in the brake booster. For
this reason, the brake pedal must be pressed
harder in order to achieve the same braking
effect. Your work will be easier if you run the
engine briefly. This will build up vacuum in the
brake booster again.
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01-300

Output Diagnostic Test Mode (DTM)
-
End

Indicated on display:
Note:
The output diagnostic test mode is completed. The ABS/EDL warning light
and the red warning symbol for brake system go out.
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display:
Note:
If the ABS/EDL warning light does not go out, this indicates a
malfunction in the system. Observe test sequence exactly page 01
-
17
.
- Press buttons -0- and -6- to select "End Output" function 06. Press -Q-
button to confirm input.
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