Reading

The measured values in the functions read measured value block and basic setting are described during the individual component test. This table serves only as an overview.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required







- VAG 1551 scan tool (or VAG 1552 vehicle system tester) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the vehicle diagnostic, testing and information system VAS 5051.

Test prerequisites







- The fuses must be OK.







- The main fuses must be OK.
- The battery voltage must be at least 11.5 V.
- Ground (GND) connection between engine and body must be OK.
- All electrical devices, e.g. lights and rear window heating must be switched off.
- If the vehicle is equipped with air conditioning, this must be switched off.
- Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
- Coolant temperature must be at least 85 degrees C, See display group 1, display zone 2.
- Three Way Catalytic Converter (TWC) temperature must be at least 380 degrees C, See display group 46, display zone 2.
- No Diagnostic Trouble Codes (DTCs) must be stored in DTC memory, DTC memory, checking and erasing. Reading Diagnostic Trouble Codes

Work sequence
- Connect VAG 1551 scan tool ((VAG 1552) and select Engine Control Module (ECM) with the "Address word" 01. When doing this the engine must be running at idle: (Connecting scan tool and selecting Engine Control Module (ECM)). [1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -8- for function "Read measured value (data) block" and confirm entry with -Q- button.

Indicated on display:


Read measured value (data) block
Input display group number XXX


- Select required display group number.

NOTE: The display group number 1 is an example, to illustrate the sequence.

- Press buttons -0-, -0- and -1- for "Display group number 1" and confirm entry with -Q- button.

Indicated on display: (1...4 = display zones)


Read measured value block 1 ->
1 2 3 4

NOTE: To change to another display group proceed as follows:







- If the specifications in all display zones are obtained, See - press button.

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -6- for the function "End output" and confirm entry with the -Q- button.

NOTE: Measured value blocks which are not described in this chapter are currently only intended for research and development and production. The values displayed are not relevant for service department troubleshooting.