Read Measuring Valve Block (Function 08)
The control module can transfer test data (measured values) to VAS 5051 vehicle diagnostic, testing and information system or VAG 1551 scan tool. These measured values can provide information about the operational condition of the system and the sensors connected to it. In many cases the data supplied can be used to help trace and repair malfunctions The measured values provided by the ESP are grouped in six Display Groups, which can be called up via Display Group numbers.
- Connect VAS 5051 vehicle diagnostic, testing and information system or VAG 1551 scan tool and select address word 03 for "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 measured value block, also check wiring and connectors for intermittent loose contacts.
- Check the control module version.
Indicated on display
- Press buttons -0- and -8- for the function "Read Measuring Value Block".
Indicated on display:
- Press-Q- button to confirm input.
Indicated on display
- Press buttons -0-, -0- and -1-.
- Press -Q- button to confirm input.
Read measuring value block: display group 1
Notes:
^ Display zones 1 to 4 show the actual wheel speeds (at the tire circumference) in km/h. These are calculated by ABS control module (w/EDL) -J104- on the basis of the signals received from the wheel speed sensors. If one of the display zones shows no reading, proceed as for DTC's 00283, 00285, 00287, 00290 "Speed sensor", DTC table.
^ In order to check that the speed sensor signals are correctly assigned to the four wheels, the vehicle must be raised. On vehicles with manual transmission put the gear shift in neutral. On vehicles with automatic transmission move the selector lever to position "N". Turn the relevant wheel by hand, and at the same time prevent the other driven wheels from rotating.
^ When the vehicle is accelerated uniformly on a dry surface, the displayed values will increase continuously in rising whole numbers (e.g. to 6 km/h, 7 km/h, 8 km/h...). The difference between displayed values 1 to 4 should be not be more than --> 1 km/h (error from out-of-round-wheels). If the values jump (for instance from 6 km/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.
Read measuring value block: display group 1
1) The On Board Diagnostic (OBD) is terminated by ABS control module (w/EDL) -J104- if road speed exceeds 19 km/h. The lowest speed that can be displayed is 1 km/h; this means the tester will show a speed of 1 km/h when the actual wheel speed is 0 km/h.
Note: The display group numbers can be selected in sequence by pressing buttons -1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)" and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -0-, -0- and -2-.
- Press -Q- button to confirm input.
Read measuring value block: display group 2
Note: The display group numbers can be selected in sequence by pressing buttons-1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)"and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -0-, -0- and -3-.
- Press -Q- button to confirm input.
Note: For Display Group 3:
^ If you wish to read out the display zones for engine speed and actual engine torque with the engine running, you must first interrupt the diagnostic link between the scan tool and the control module using the function "End Output". Then start the engine and set up the diagnostic link between scan tool and control module once again.
Indicated on display:
- Press buttons -0- and -3- for the function "Read Measuring Value Block".
- Press -Q- button to confirm input.
Indicated on display
- Press buttons -0-, -0- and -3-.
- Press -Q- button to confirm input.
Read measuring value block: display group 3
Notes:
^ The On Board Diagnostic (OBD) is terminated by ABS control module (w/EDL) -J104- if road speed exceeds 19 km/h.
^ If Torque reduction value is subtracted from the Engine torque value, the result is Engine torque - actual (referred to as MMI)
Note: The display group numbers can be selected in sequence by pressing buttons -1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)" and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -0-, -0- and -4-.
- Press -Q- button to confirm input.
Note: For Read measuring value block: display group 4
^ On control modules with Part No. 4D0 907 389 (without index letter), group No. 4 is vacant, and cannot be selected by pressing buttons -1- and -3- on VAG 1551 scan tool or buttons (arrow up) and (arrow down) on VAG 1552 scan tool.
^ If you try to select Display Group No. 4, the display will show:
Indicated on display
- Press --> button.
Indicated on display
If you do not wish to exit from the function "Read Measuring Value Block" you must avoid selecting Display Group No. 4: press button -C- and select Display Group No. 3 or 5 directly by entering the respective number.
Read measuring value block: display group 4
Note: The On Board Diagnostic (OBD) is terminated by ABS control module (w/EDL) -J104- if road speed exceeds 19 km/h.
Note: The display group numbers can be selected in sequence by pressing buttons -1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)" and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -0-, -0- and -5-.
- Press -Q- button to confirm input.
Note: For Display Group 5:
^ If you wish to read out the display zones for rotation rate and lateral acceleration while the vehicle is moving, you must first break off the diagnostic link between the scan tool and the control module using the function "End Output. Then start the engine and set up the diagnostic link between scan tool and control module once again.
Indicated on display:
- Press buttons -0- and -8- for the function "Read Measuring Value Block".
- Press -Q- button to confirm input.
Indicated on display
- Press buttons -0-, -0- and -5-.
- Press -Q- button to confirm input.
Read measuring value block: display group 5
1) If the steering angle sensor is OK, a display will follow even if a zero position adjustment was not performed.
Note: The On Board Diagnostic (OBD) is terminated by ABS control module (w/EDL) -J104- if road speed exceeds 19 km/h.
If no display appears, press button -C-, select Function 02 and Check DTC Memory. Repair malfunction according to DTC table.
Note: The lateral acceleration sender and the combined sender for rotation rate and lateral acceleration are very sensitive to impacts. If one of these sensors is dropped by accident it must not be installed in the vehicle: install a new sensor.
Fig. 1 Sensor for transverse acceleration -G200-
- Remove the sender (or the combined sender for rotation rate and lateral acceleration) in order to test it.
- Take out the rear seat bench. Unscrew bolts and detach control module for ultrasound sensors -J347- and then the sender.
- Leave the connector plugged in, and turn the sender 90° about its longitudinal axis in relation to its normal installed position.
This should give a reading of - 9.8 ± 1 m/s2 or + 9.8 ± 1 m/s2 on the scan tool in Display Group 5 of the function "Read Measuring Value Block".
A positive (+) reading will be indicated when the sender is subjected to lateral acceleration in a left-hand corner.
A negative (-) reading will be indicated when the sender is subjected to lateral acceleration in a right-hand corner.
- When installing, tighten bolts securing sensor for transverse acceleration -G200- or combined sender for rotation rate and lateral acceleration to 5 Nm (44 inch lbs.).
- Tighten bolts securing control module for ultrasound sensors -J347- to 2 Nm (18 inch lbs.).
Note: Due to error in test card 8.0 for VAG 1551 scan tool and test card 5.0 for VAG 1552 scan tool, the value displayed in the measured value block (Display group 5, Display zone 4) is reduced by a factor of ten. In other words a lateral acceleration of 9.81 m/s2, for example, is indicated incorrectly as 0.98 m/s2.
Note: The display group numbers can be selected in sequence by pressing buttons -1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)" and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -0-, -0- and -6-.
- Press -Q- button to confirm input.
Read measuring value block: display group 6
Note: The display group numbers can be selected in sequence by pressing buttons -1- and -3- (VAG 1551 scan tool) or buttons (arrow up) and (arrow down) (VAG 1552 scan tool) or by pressing "(arrow up)" and "(arrow down)" on the screen of VAS 5051 vehicle diagnostic, testing and information system.
- Press button -C- in order to enter the display group number manually.
Indicated on display
- Press buttons -1-, -2- and -5-.
- Press -Q- button to confirm input.
Note: For Read measuring value block: display group 125
^ On vehicles with control module No. 4B0 907 389, Display Group No. 125 is vacant, and cannot be selected either directly by entering a number, or by pressing buttons -1- and -3- on VAG1551 scan tool or buttons (arrow up) and (arrow down) on VAG 1552 scan tool.
^ If you try to select Display Group No. 125, the display will show:
Indicated on display
- Press --> button.
Indicated on display
Read measuring value block: display group 125
1) If the steering angle sensor is OK, it sends information, even if a zero position adjustment has not yet been performed after replacement.
Note: The On Board Diagnostic (OBD) is terminated by ABS control module (w/EDL) -J104- if road speed exceeds 19 km/h.
Read measuring value block: display group 126
Note: Measuring value block 126 is only valid for A6 Allroad!