Read Measuring Value Block (Function 08)

Read Measured Value Block
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 sensors connected to it. In many cases the transferred data supports DTC findings and DTC correction. Test data has been summarized into single display groups because all the information cannot be evaluated at the same time. Information can be selected via display group numbers.
- Connect Scan tool VAG 1551 and select (address word -03-) "Brake electronics Control Module" with ignition switched on. VAG 1551 Scan Tool Connecting and Selecting Function





Indicated on display
- Press buttons -0- and -8-. ("Read Measured Value Block" is initiated with -08-.)





Indicated on display
- Confirm entry with -Q- button.





Indicated on display
- Enter display group number refer to List of selectable display group numbers.





List Of Selectable Display Group Numbers

Test Sequence And Test Tables With Measured Values
Checking speed sensor application

Display group number 001
- Press buttons -0-, -0- and -1 -
- Confirm entry with -Q- button.





There are always 4 display fields (arrows) in the Measured Value Block. Decoding individual values in display fields 1 to 4 can be read off from the following tables.





Indicated on display (vehicle stationary)
Press -C- button for next display group number entry.
If the -> button is pressed, buttons -0- and -8- for work sequence "Read Measured Value Block" must be pressed again to regain entry.





Note:
For display group number 001 remember:
^ Momentary wheel speeds are displayed. They serve to check speed sensor application to the wheel. (Vehicle must be raised and wheel must be rotated by hand by a 2nd technician).

Checking Speed Sensor
Display Group Number 002
Reading the measured value block for display group number 002 must be done when driving slowly. When doing this the Control Module -J104 saves the first usable voltage signal from speed sensor and displays this in the measured value block. The values are displayed on the VAG 1551 when driving slowly.
- Press buttons -0-, -0- and -2-
- Confirm entry with -Q- button.





There are always 4 display fields (arrows) in Measured Value Block. Decoding individual values in display fields 1 to 4 can be read from following tables.





Indicated on display (Vehicle stationary)
Press -C- button for next display group number entry.
If the -> button is pressed, buttons -0- and -8- for work sequence "Read Measured Value Block" must be pressed again to regain entry.





Note:
For display group number 002 remember:
^ Deviations in display fields 1 to 4 of displayed values must be above 6 km/h (5 mph).
^ Deviations in display fields 3 to 4 of displayed values must be above 2 km/h (2 mph).

1) If deviations in display fields 1 to 2 are greater than 6 km/h (5 mph) the following may be the DTC cause:
2) It deviations in display fields 3 to 4 are greater than 2 km/h (2 mph) the following may be the DTC cause:

Note:
^ Air gap between speed sensor and rotor may be too wide. Ensure speed sensor is attached correctly to wheel bearing housing.
^ Speed sensor or rotor exterior damaged. Change damaged component.

Checking Brake Light Switch for ABS and ABS/EDL Function





Display group number 003
- Press buttons -0-, -0- and -3-
- Confirm entry with -Q- button.





- There are always 4 display fields (arrows) in the Measured Value Block. Decoding individual values in display fields 1 to 4 can be read-off from the following tables.





Indicated on display
Press -C- button for next display group number entry
If the -> button is pressed, buttons -0- and -8- for work sequence "Read Measured Value Block" must be pressed again to regain entry.