Function 08, Measured Value Block, Reading
A display group with 7 display fields is provided.
If the printer is switched on, the readout on the display is printed out on the log.
- Observe test requirements SAFETY PRECAUTIONS AND TROUBLESHOOTING
- DTC memory has been checked and all malfunctions have been traced and repaired
-- Connect scan tool: VAG1551 to Data Link Connectors (DLC) in auxiliary relay panel I on left side of plenum chamber, using : VAG1551 /1 adapter cable SCAN TOOL VAG 1551, CONNECTING AND SELECTING FUNCTIONS .
Indicated on display FUNCTION 08, MEASURED VALUE BLOCK, READING => List Item: Operating modes 1 and 2 are displayed alternately
| V. A. G. - On Board Diagnostic HELP 1 - Rapid data transfer |
| V. A. G. - On Board Diagnostic HELP 2 - Blink code output |
-- Switch on ignition or start engine.
The HELP button on VAG 1551can be used to call up additional operating instructions.
The → button is used to advance to the next step in the On Board Diagnostic program sequence.
The printer can be switched on by pressing the PRINT button (indicator light comes on in button).
-- Press button 1 for "Rapid data transfer" operating mode.
Indicated on display
| Rapid data transfer HELP Insert address word XX |
-- Press buttons 0 and 3 to insert "Brake Electronics" address word 03.
Indicated on display
| Rapid data transmission Q 03 - Brake Electronics |
-- Press Q button to confirm input.
ABS control module identification indicated on display
| 4A0 907 379 A Brake electronics |
The "A" suffix in the control module identification indicates vehicles without Electronic Differential Lock (EDL).
For identification of appropriate ABS Control Module (w/EDL) -J104- => see Parts Information.
-- Press → button.
If any of the following appear in the display:
| Control module does not answer |
-- Press HELP button to print out a list of possible causes.
-- Follow specific recommendations below.
--
| K wire not switching to Ground HELP |
-- Indicated on display
-- Check wiring and connections for Data Link Connectors DATA LINK CONNECTOR VAG 1551 WIRING, CHECKING .
| K wire not switching to B+ HELP |
--
| No signal from control module |
-- Indicated on display
-- Check power supply and Ground connection to ABS Control Module (w/EDL) -J104- using wiring diagram.
-- After correcting possible malfunctions, once again insert "Brake Electronics" address word 03 and press Q button to confirm input.
Indicated on display
| Error in communication link |
-- If this display appears DATA LINK CONNECTOR VAG 1551 WIRING, CHECKING for correcting possible malfunction.
Indicated on display
| Rapid data transfer HELP Select function XX |
-- Press buttons 0 and 8 to select "Read Measuring Value Block" function 08.
Indicated on display
| Rapid data transfer Q 08 - Read measuring value block |
-- Press Q button to confirm input.
Indicated on display
| Read measurement block HELP Input display group number XXX |
-- Press 0 button three times to input display group 000.
-- Press Q button to confirm input.
Indicated on display
| Read measurement block 1 2 3 4 5 6 7 |
Display fields 1 to 4 indicate wheel speed in km/h. This is calculated by the ABS Control Module (w/EDL) -J104- according to the input signals from the ABS wheel speed sensors.
If the vehicle is accelerated or moved at steady speed on a dry surface, variation in display fields 1 to 4 of up to ±1 km/h is permissible. If the difference is greater, check the ABS wheel speed sensors and rotors. FRONT AXLE ANTILOCK BRAKE SYSTEM COMPONENT OVERVIEW
To check whether the sensors are correctly connected, turn the wheels by hand (block the other wheel of the driven axle to prevent it also turning). If the displayed values indicate a malfunction, carry out a function test using the Bosch Abs Tester: VAG1710 .
Test table - read measuring value block
| Display field | Designation | Test Condition | : VAG1551 display | ||
|---|---|---|---|---|---|
| 1 | Front left wheel speed (km/h) | - | 1 (vehicle standing) to 19(1) | ||
| 2 | Front right wheel speed (km/h) | - | 1 (vehicle standing) to 19(1) | ||
| 3 | Rear left wheel speed (km/h) | - | 1 (vehicle standing) to 19(1) | ||
| 4 | Rear right wheel speed (km/h) | - | 1 (vehicle standing) to 19(1) | ||
| 5 | Brake light switch -F- (terminal 25 on ABS Control Module (w/EDL) -J104-) |
|
0 | ||
|
1 | ||||
| 6 | Voltage to ABS return flow pump -V39- | - | 0 Note: If 1 is displayed, carry out function test with Bosch Abs Tester: VAG1710 (test steps 3 and 5). | ||
| 7 | ABS solenoid valve relay -J106- (terminal 32 on ABS Control Module (w/EDL) -J104-) |
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1 Note: If 0 is displayed, carry out function test with Bosch Abs Tester: VAG1710 (test steps 1 and 5). | ||
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