display AUDI A4 1998 B5 / 1.G Brakes Read Mesure Value Block Workshop Manual

01-61


Read Measuring Value Block
(function 08)
The control module can transmit measured
values to the VAG1551 Scan Tool (ST). 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
Bosch 5.0 series are contained in three display
groups, which can be accessed via their display
group numbers.

- Connect the VAG1551 Scan Tool (ST) and
select "Brake Electronics" via address word 03
page 01
-4 .

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.

- Check the control module version page 01
-52

and press the button.
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01-62

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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01-63
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" DTC table page 01
-98
.
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 to 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, Suspension, Wheels, Steering, Repair Group 40

Repair Manual, Suspension, Wheels, Steering, Repair Group 42

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


Rear right wheel circumference speed

Rear left wheel circumference speed
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01-64

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.
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01-65
Test table: display group 2 Read measuring value block
2
Indicated on display
0 or 1
0 or 1

0 or 1
0 or 1



ABS solenoid valve relay:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward
left.
0 not permitted during "Read measuring value block", the relay was not
activated during "ignition on".
- Carry out "Electrical test", step 11 page 01
-68
.
1 specified value, relay was activated by ABS control module -J104- during
ignition on.

Voltage at motor for ABS return flow pump:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward left.

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.
- Carry out "Electrical test", step 12 page 01
-68
.

Brake light switch: Additional signal only for
All Wheel Drive (AWD):
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01-66

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.
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01-67
Test table: display group 3 Read measuring value block
3
Indicated on display
60 to
8000
1 RPM 0 to
100
%
0 or 1
---


Traction control (ASR) button: (Only for vehicles equipped with ASR)

0 Traction control button not operated. 1 The traction control button is operated, operational condition of ASR alternates, i.e. "ASR
OFF" and "ASR ON". When ASR is switched off via the traction control button, the warning lamp for ASR lights up.
- Check traction control button if there are deviations. Carry out "Electrical test", step 22 page 01
-
68
.

Actual engine torque (AET): (Only for vehicles equipped with ASR)
0% vehicle is in deceleration mode.20% - 30% represents engine idle.100% engine is offering its maximum torque.
- If no indication is displayed, proceed according to DTC 00647 "ABS-ASR engine electrical connection 2". DTC
table page 01
-98
.
Engine speed: (Only for vehicles equipped with ASR)

Engine speed is displayed in increments of 60 RPM, starting at 60 RPM.
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- If no indication is displayed, proceed according to DTC 00529 "Wheel speed information missing. No signal". DTC table
page 01
-98
.
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01-97
Diagnostic Trouble Code (DTC) table

Notes:

Connect the VAG1551 Scan Tool (ST) and select address word 03 "Brake Electronics".
Check the control module version page 01
-52
and press the button.
Press buttons -0- and -2- to select "Check DTC Memory" function 02. Press -Q- button to confirm input.
Notes:
Each malfunction is assigned a 5-digit Diagnostic Trouble Code (DTC). The DTC is located in the left column of the DTC
table. If you have switched the printer on by pressing the "PRINT" button, the VAG1551 scan tool (ST) prints the message
identifying the malfunction and the DTC. Otherwise, DTCs are not displayed by the VAG1551 scan tool.
The contents of DTC memory remain stored until memory is erased, page 01
-15
.
Sporadically occurring malfunctions are identified via indication of "/SP" on the right-hand side of the display.
Static malfunctions that cannot be detected when the vehicle is stationary are also identified with "/SP" if the ignition has
been switched off and then on again.
The following DTC table includes all the DTCs that can be stored by the ABS control module -J104- and displayed and
printed out by the VAS5051 tester or VAG1551 scan tool. Malfunctions are listed by DTC number.
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01-98
Diagnostic Trouble Code (DTC) table Output on printer of VAG1551
Scan Tool (ST) Possible cause
Corrective action
DTC

00000
No malfunction recognized!
If this display appears, process
is concluded. No DTCs are
stored in DTC memory.
If corresponding warning lamps
light up anyway, check the
following points:
Voltage supply for ABS control module -J104-
below 10.5 volts at a vehicle speed less than 6
km/h. Open circuit in activation wire for ABS warning
light -K47- between ABS control module (w/EDL) -
J104- and instrument cluster combination
processor -J218-. - See section "Overview of
indicator lamp functions"
If no malfunction can be found, and there is still a
problem, there may be a mechanical malfunction (e.g.
solenoid valve sticking). - Expand troubleshooting to
include "Electrical test", function
test page 01
-68
.
Pa
ge 53 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
pair&id=AUDI.B5.SU02.01.8