Read Measuring Value Block

Measured value block, reading

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.

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 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

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 VAG 1551 scan tool and select (address word 03) brake electronics control module with ignition switched on.

Indicated on display:
- Press keys 0 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. List of selectable display group numbers.

Overview of selectable display group numbers

1) 4MOTION vehicles only
2) ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP EMOTION
3) Vehicles with automatic transmission only

Test sequence and test tables with measured values

Checking speed sensor allocation

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.

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 faults 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 faults may be present:

Note:
- Air 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 lamp

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.

1) During the diagnosis, ABS warning light -K47- and Warning light for brake system -K118- will flash.

Checking steering angle sensor, sensor for transverse acceleration and sender for rotation rate1)

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) For ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP 4MOTION 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-. When doing this, do not pull connector off sensor for transverse acceleration -G200-.

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 V.A.G. 1551 scan fool.

The sensor for transverse acceleration -G200 can be checked with the help of function "Read measured value block", display group 005.

- There are always 3 display zones -arrows-. Display zone 2 displays the value for the sensor for transverse acceleration -G200-.

Indicated on display: e.g. (vehicle stationary)
1) For ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP 4MOTION only

- Turn 90° to right of installation position (see illustration).
- Display in display zone 2 (with vehicle stationary) e.g. -9.8 + 1 m/s2.
A negative result equates to the forces during a right turn.

- Turn 90° to left of installation position (see illustration).
- Display in display zone 2 (with vehicle stationary) e.g. 9.8 +1 m/s2.
A positive result equates to the forces during a left 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.

1) For ABS/EDL/ASR/ESP and ABS/EDL/ASR/ESP 4MOTION only

Checking longitudinal acceleration sensor G251 1)

Display group number 006
- Press keys 0, 0 and 6
- 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.

1) When performing a test drive where the VAG 1551 scan tool or tester VAS 5051 is connected and in diagnosis or read measured value block mode there is no ABS regulation. The ABS warning light does not light up. The OBD of ABS control module (w/EDL) -J104- is terminated when exceeding a speed of 20 km/h (13 mph).

Checking longitudinal acceleration sensor G251 1)
- Remove longitudinal acceleration sensor -G251 without pulling off connector.

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 V.A.G. 1551 scan fool.
The longitudinal acceleration sensor -G251- can be checked with the help of function "Read measured value block", display group 006.

- 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)
1) For 4MOTION vehicles only

- Turn 90° to right of installation position (see illustration).
- Display in display zone 1 (with vehicle stationary) e.g. +9.8 _1 m/s2.
A positive sign corresponds to the force when driving forward.

- Turn 90° to left of installation position (see illustration).
- Display in display zone 1 (with vehicle stationary) e.g. -9.8 _ 1 m/s2.
A negative sign corresponds to the force when driving backward.

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.

1) Vehicles with automatic transmission only.

- Incorrect transmission control module or incorrect transmission control module coding.
- Transmission control module malfunction.
2) For 4MOTION vehicles only
3) Data bus connection is interrupted or data bus wires are interchanged.