1999 AUDI A4 brake

01-267
Test table: display group 4 Read measuring value block
4
Indicated on display
00:00 h
or
invalid Off/on
not
used not
used





EDL shut-off

Electronic Differential Lock (EDL) is deactivated at excessive brake temperature (only EDL).
Standing time (TIM):

The standing time (TIM) is used to calculate how much the brakes have cooled while the ignition is off. The ABS control
module -J104- receives the standing time signal from the instrument cluster.
- 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
.
Invalid:

Battery disconnected or completely discharged
Open circuit in wire from ABS control module (w/EDL) -J104- to instrument cluster
Note:
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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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01-274
Test table: display group 6 Read measuring value
block 6
Indicated on display
0 volts to 18
volts
on
or
off
on
or
off 0 ...
131071


Workshop code:

The workshop code indicates the last workshop that executed the "Login Procedure" (function
11) under address word 03, "Brake electronics" page 01
-237
.
If no code is displayed, the "Login Procedure" under address word 03 "Brake Electronics" has
not been carried out yet.

Voltage at motor for ABS return flow pump:

off specified value, there is no voltage at the motor for the ABS return flow pump. on not permitted during "Read measuring value block", there is voltage at the motor for the ABS
return flow pump.
- Carry out "Electrical test", steps 12, 23 and 24.

ABS solenoid valve relay:

on specified value, relay was activated by ABS control module -J104- during ignition on. off not permitted during "Read measuring value block", the relay was not activated during "ignition on".
- Carry out "Electrical test", steps 11 and 22.
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01-280
Are you sure there are no electrical malfunctions
in the system? If you have made sure that there
are no electrical malfunctions in the system, you
will be able to identify any mechanical
malfunctions in the individual actuators if the
results of the output DTM are not as specified
here. Replace the relevant part.
With the Bosch 5.3 ABS/ESP the output
Diagnostic Test Mode (DTM) enables you to
check the electrically actuated hydraulic valves
and the pump motor in the hydraulic module. You
can also check that the brake lines going to the
four wheels are connected correctly.
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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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01-283

- Connect VAS5051 tester or VAG1551 scan tool
and select the address word 03 "Brake
Electronics".

- Check the control module version page 01
-
128
and press the button.
Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode
(DTM)" function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode
(DTM
)

Indicated on display:
- Press -Q- button to confirm input.
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01-284

Output Diagnostic Test Mode (DTM)
-
ABS hydraulic pump -
V64-

Indicated on display:
ABS hydraulic pump -V64- must start running. This is audible.

When you put your foot on the brake pedal you can feel it vibrating. The
brake pedal vibrates because the hydraulic pump generates pressure
pulses in the brake lines. The pressure pulses generate oscillations.
These are directed to the brake pedal and make it vibrate.
The pressure pulses in the brake lines are not sufficient to lock the
wheels.
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01-286

Output Diagnostic Test Mode (DTM)
-
Operate brake

Indicated on display:
-
Press button.
Output Diagnostic Test Mode (DTM)
-
Ifl: 0V
Ofl: 0V
fl wheel locked

Indicated on display:

When you press the brake pedal, brake fluid pressure will be built up in all
four calipers. All four wheels lock.
Requirement for this: mechanical/hydraulic components of the brake
system must be fully functional. This means that the master brake cylinder
is able to build up pressure in all wheel cylinders and the hydraulic
connections and lines are all sealed properly.
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