Read Measuring Valve Block
Read Measuring Value Block (scan tool function 08)
The ABS control module has the capability to display test data (measuring values). These measured values can 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 help trace and repair malfunctions. The measured values provided by the Bosch 5.3 ABS/EDL are accessible in four display groups, which can be called up according to their display group numbers.
CAUTION: Observe safety precautions for road testing. Safety Precautions and General Troubleshooting Information
- Connect VAG1551 Scan Tool (ST) to Data Link Connector (DLC).
- Select "Rapid data transfer" operating mode 1 and insert "Brake Electronics" address word 03.
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 intermittent loose terminals.
- Check control module version. Check Control Module Versions (Scan Tool Function 01)
- Press -> button.
Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.
Indicated on display
- Press -Q- button to confirm input.
Indicated on display
- Press buttons -0-, -0- and -1- to input display group no. 1 (001).
- Press -Q- button to confirm input.
Test table: display group 1 (001)
Notes:
- Display fields 1 to 4 show the actual wheel speeds (at the tire circumference) 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", Refer to: DTC table. Checking DTC Memory (Scan Tools Function 02)
- In order to check that the wheel speed sensor signals are correctly assigned to the four wheels, the vehicle must be raised. On vehicles with manual transmission put the shift lever 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 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. ... 6 km/h, 7 km/h, 8 km/h ... ). The difference between displayed values 1-4 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.
Refer to Steering and Suspension.
Note: The display group numbers can be selected in sequence by pressing buttons <-1 and 3->.
- Press -C- button to input display group number manually.
Indicated on display
- Press buttons -0-, -0- and -2- to input display group no. 2 (002).
- Press -Q- button to confirm input.
Test table: display group 2 (002)
Note: The display group numbers can be selected in sequence by pressing buttons <-1 and 3->.
- Press -C- button to input display group number manually.
Indicated on display
Note for display group 3. (003)
If you wish to check the display fields for engine RPM and actual engine torque with the engine running, you must first interrupt the diagnostic link between the scan tool and the ABS control module using "End Output" function 06. End Output Then, start the engine and set up the diagnostic link between the scan tool and the ABS control module once again.
- 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- to input display group no. 3 (003).
- Press -Q- button to confirm input.
Test table: display group 3 (003)
Note: The display group numbers can be selected in sequence by pressing buttons <- 1 and 3->.
- Press -C- button to input display group number manually.
Indicated on display
- Press buttons -0-, -0- and -4- to input display group no. 4 (004).
- Press -Q- button to confirm input.
Test table: display group 4 (004)