1996 AUDI A4 Brakes Read Mesure Value Block 08 Workshop Manual

01-140


Read Measuring Value Block
(function 08)
The control module can transmit measured
values. 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 from the ABS/EDL Bosch 5.3
series are contained in four display groups,
which can be accessed via their display group
numbers.

- Observe safety precautions that apply to road
tests.

- Connect the VAG1551 Scan Tool (ST) and
select address word 03 "Brake Electronics".

Notes:

When the printer is switched on, the contents of
the display will be printed out on the scan tool
log.
When reading the measuring value block, also
check wiring and connectors for loose
terminals.

Pa
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g Value Block
(function 08
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- Check the control module version page 01
-
128
and press the button.
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g Value Block
(function 08
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01-141

Rapid data transfer
HELP
Select function XX

Indicated on display:
- Press buttons -0- and -8- to select "Read measuring value block"
function 08.
Rapid data transfer
Q
08 - Read measurin
g value block

Indicated on display:
- Press -Q- button to confirm input.
Read measurin
g value block
HELP
Input display group number
XXX

Indicated on display:
- Press buttons -0-, -0- and -1-.
- Press -Q- button to confirm input.
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g Value Block
(function 08
)
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01-142
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" Diagnostic Trouble Code (DTC)
table
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

Read measuring value block
1
Indicated on display
1 to 19
1)
km/h 1 to 19
1)
km/h
1 to 19
1)
km/h 1 to 19
1)
km/h


Right rear ABS wheel speed sensor

Left rear ABS wheel speed sensor

Right front ABS wheel speed sensor
Pa
ge 4 of 13 Read Measurin
g Value Block
(function 08
)
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pair&id=AUDI.B5.SU02.01.12

Left front ABS wheel speed sensor 1) On Board Diagnostic (OBD) is terminated by the ABS control module -J104- if road speed exceeds 19 km/h.
Pa
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g Value Block
(function 08
)
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01-143

Note:
The display group numbers can be selected in
sequence by pressing buttons <-1 and 3-> on the
VAG1551 scan tool, or the arrow buttons and
on the VAG1552 mobile scan tool.
- Press -C- button to input display group number
manually. Read Measurin
g Value Block
Enter displa
y group number XXX

Indicated on display:
- Press buttons -0-, -0- and -2-.
- Press -Q- button to confirm input.
Pa
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g Value Block
(function 08
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01-144
Test table: display group 2 Read measuring value block
2
Indicated on display
0 or 1
0 or 1

0 or 1
---


ABS solenoid valve relay:

0 not permitted during "Read measuring value block", the relay was not activated during "ignition
on".
- Electrical test, steps 1 and 2, check voltage supply page 01
-166
. If no malfunction can be found
here, replace hydraulic control unit.
1 specified value, relay was activated by ABS control module -J104- during ignition on.

Voltage at motor for ABS return flow pump:
0 specified value, there is no voltage at the motor for the ABS return flow pump.1 not permitted during "Read measuring value block", there is voltage at the motor for the ABS return flow
pump. Replace hydraulic control unit.
Brake light switch:

0 Brake pedal not operated 1 Brake pedal operated

- Check brake light switch if there are deviations. Carry out "Electrical test",
step 3 page 01
-166
.
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g Value Block
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01-145

Note:
The display group numbers can be selected in
sequence by pressing buttons <-1 and 3-> on the
VAG1551 scan tool, or the arrow buttons and
on the VAG1552 mobile scan tool.
- Press -C- button to input display group number
manually. Read Measurin
g Value Block
Enter displa
y group number XXX

Indicated on display:
Note:
For display group 3 (005):
To read the display fields for engine speed and current engine torque
with the engine running, communication between the scan tool and
the control module must be terminated via the "End Output" function
page 01
-16
. Start the engine and reinitiate communication
between the scan tool and the control module.
- Press buttons -0- and -8- to select "Read measuring value block"
function 08.
- Press -Q- button to confirm input.
- Press buttons -0-, -0- and -3-.
- Press -Q- button to confirm input.
Pa
ge 8 of 13 Read Measurin
g Value Block
(function 08
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.12