Measured Value Block, Reading
Measured Value Block, Reading
Note:
^ All functions which could previously be performed with Scan Tool VAG1551 can also be carried out with the Vehicle Diagnostic Testing and Information System VAS5051.
The control module can transfer a considerable amount of test data. This test data delivers information on the operational condition of the system and/or sensor connected to it. In many cases the transferred test data supports troubleshooting and repair. The test data has been summarized into single display groups because all the information cannot be evaluated at the same time. The information can be selected via display group numbers.
Safety Precautions
CAUTION:
^ If the use of test and information devices during a test drive is necessary, observe the following:
^ You must always secure testing and measuring equipment on the rear seat.
^ When vehicle is being driven, a second technician must operate this equipment.
- Connect Scan Tool VAG1551 and select (address word 03) brake electronics control module with ignition switched on;.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
- Press keys 0 and 8. (The function "Read measured value block" is initiated with 08.)
Indicated on display:
Rapid data transfer Q
08 - Read measured value block
- Confirm entry with key Q.
Indicated on display:
Read measured value block
Enter display group number XXX
- Enter display group number.
Selectable Display Group Numbers, Overview
Test Sequence and Test Tables with Measured Values
Speed Sensor Application, Checking
Display group number 001
- Press keys 0, 0 and 1.
- Confirm entry with key Q.
- There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read-off from the following tables.
Read measured value block 1 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: (vehicle stationary)
Read measured value block 1 ->
0 km/h 0 km/h 0 km/h 0 km/h
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
Note:
^ For display group number 001 remember:
^ The actual wheel speeds are displayed. They serve to check the speed sensor allocation to the wheel. (The vehicle must be raised and the wheel must be rotated by hand by a 2nd mechanic).
Speed Sensor, Checking
Display group number 002
- Press keys 0, 0 and 2.
- Confirm entry with key Q.
- There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read-off from the following tables.
Read measured value block 2 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: (vehicle stationary)
Read measured value block 2 ->
255 km/h 255 km/h 255 km/h 255 km/h
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
Note:
^ For display group number 002 remember:
^ The reading of measured value blocks in display group number 002 must be undertaken when driving off slowly. Then the ABS Control Module J104 (w/EDL) will store the first usable voltage signals provided by the speed sensors and display these as a fixed value in the measured value block.
^ Air gap between speed sensor and rotor may be too big.
- Check that speed sensor is screwed correctly to wheel bearing housing.
^ Speed sensor or rotor exterior damaged.
- Change damaged component.
Brake Light Switch, Brake System Warning Lamp, ABS Warning Lamp and ASR/ESP Warning Lamp, Checking
Display group number 003
- Press keys 0, 0 and 3
- Confirm entry with key Q.
- There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read-off from the following tables.
Read measured value block 3 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: (vehicle stationary)
Read measured value block 3 ->
not oper. off off off
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterward to regain entry.
Steering Angle, Lateral Acceleration and Yaw Rate Sensors, Checking
Display group number 004
- Press keys 0, 0 and 4
- Confirm entry with key Q.
- There are always 3 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 3 can be read-off from the following tables.
Read measured value block 4 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: e.g. (vehicle stationary)
Read measured value block 4 ->
0.0 degree 0.0m/s2 1.26 degree/S
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
Transverse Acceleration Sensor, Checking
- Remove Transverse Acceleration Sensor G200. Do not pull connector off Transverse Acceleration Sensor G200 when doing this.
Note:
^ All functions that have so far been carried out with VAG 1551 can now also be carried out with the Vehicle Diagnostic Testing and Information System VAS5051.
- Connect Scan Tool VAG 1551.
The Transverse Acceleration Sensor G200 can be checked with the help of function "Read measured value block", display group number 005.
- In read measured value block there are 3 display zones - arrows -. The values for the Transverse Acceleration Sensor G200 are displayed in display zone 2.
Read measured value block 4 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: e.g. (vehicle stationary)
Read measured value block 4 ->
0.0 degree 0.0m/s2 1.26 degree/S
With ABS/EDL/ASR/ESP only.
- Turn 90 degree to right of installation position (see illustration).
- Shown on display in display zone 2 (when vehicle stationary) e.g. -9.8 plus minus 1 m/s2.
A negative result equates to the forces during a right-hand turn.
- Turn it 90 degree to left relative to installation position (see illustration).
- Shown on display in display zone 2 (when vehicle stationary) e.g. 9.8 plus minus 1 m/s2.
A positive result equates to the forces during a left-hand turn.
Brake Pressure Sensor, Checking
Display group number 005
- Press keys 0, 0 and 5
- Confirm entry with key Q.
- There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read-off from the following tables.
Read measured value block 5 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: e.g. (vehicle stationary)
Read measured value block 5 ->
- 1.06 bar
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterward to regain entry.
With ABS/EDL/ASR/ESP only.
Data Bus Wiring, Checking
Display group number 125
- Press keys 1, 2 and 5
- Confirm entry with key Q.
- There are always 4 display zones - arrows - in the measured value block. Decoding the individual values in display zones 1 to 4 can be read-off from the following tables.
Read measured value block 125 ->
-> 1 -> 2 -> 3 -> 4
Indicated on display: (when vehicle stationary)
Read measured value block 125 ->
Engine 1 St. ang. 1 Gear. 1
Press C key for the next display group number entry.
If the arrow right key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
