Measured Value Block, Reading

Measured value block, reading

Note:
All functions which could previously be performed with V.A.G 1551 can now also be carried out with the tester VAS 5051.
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 measures

WARNING:
^ 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 V A G 1551 scan tool and select (address word 03) brake electronics control module with ignition switched on.





Indicated on display:
- Press keys O and 8 (The function "Read measured value block" is initiated with 08 )





Indicated on display:
- Confirm entry with key Q





Indicated on display:
- Enter display group number, Refer to Overview of of selectable display group numbers.








Overview of selectable display group numbers
1) With ABS/EDL/ASR/ESP only.
2) Vehicles with an automatic Transmission only

Test sequence and test tables with measured values
Checking speed sensor application
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.
- Indicated on display: (vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) 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).

Checking speed sensor
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.





Indicated on display: (vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) 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 (w/EDL) -J104- will store the first usable voltage signals provided by the speed sensors and display these as a fixed value in the measured value block.
1) If the deviations in display zones 1 and 2 are greater than 6 km/h (approximately 3 75 mph), the following malfunctions may be present:
2) If the deviations in display zones 3 and 4 are greater than 2 km/h (approximately 1 25 mph), the following malfunctions may be present:
^ 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.

Checking brake light switch, brake system warning lamp, ABS warning lamp and ASR/ESP warning light
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.





Indicated on display: (vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterward to regain entry.
1) During the diagnosis the ABS warning Light for -K47- and for Warning light for brake system -K118- will flash.

Checking steering angle sender, lateral acceleration sender and yaw rate sender 1)
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.





Indicated on display: e.g. (vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
1) With ABS/EDL/ASR/ESP only.
1) During a test drive with the V.A.G 1551 scan tool or tester VAS 5051 connected and in "Diagnosis" or "Measured value block", there is no ABS or ESP regulation. The ABS or ESP warning lights will flash. The OBD of ABS control module (w/EDL) -J104- is terminated when a speed of 20 km/h (13 mph) is exceeded.

Checking sensor for transverse acceleration -G200-1 )
- Remove sensor for transverse acceleration -G200-. Do not pull connector off sensor for transverse acceleration -G200- when doing this.

Note: All functions that have so far been carried out with V.A.G 1551 can now also be carried out with the tester VAS 5051.

- Connect scan tool V.A.G 1551.
- The sensor for transverse acceleration -G200can 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 sensor for transverse acceleration -G200- are displayed in display zone 2.
Indicated on display: e.g. (vehicle stationary)
1) With ABS/EDL/ASR/ESP only.





- Turn 90° to right of installation position (see illustration).
- Shown on display in display zone 2 (when vehicle stationary) e.g. -9.8 +1 m/S2.
A negative result equates to the forces during a right-hand turn.
- Turn it 90° to left relative to installation position (see illustration).
- Shown on display in display zone 2 (when vehicle stationary) e.g. 9.8 +1 m/S2.
A positive result equates to the forces during a left-hand turn.

Checking brake pressure sensor 1)
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.





Indicated on display: e.g. (vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterward to regain entry.
1) With ABS/EDL/ASR/ESP only.

Checking data bus wiring
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.





Indicated on display: (when vehicle stationary)
Press C key for the next display group number entry.





If the (arrow) key is pressed, keys 0 and 8 for work sequence "Read measured value block" must be pressed again afterwards to regain entry.
1) Vehicles with an automatic transmission only
Refer to Powertrain Management, for relevant transmission code.
2) Data bus connection is interrupted (open circuit) or data bus wiring is interchanged.
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations binder.