On Board Diagnostic (OBD), Initiating

On Board Diagnostic (OBD), Initialing program

VAG 1551 Scan Tool (ST), connecting and selecting functions

Note: The VAG 1552 Scan Tool (ST) can be used instead of the VAG 1551, however no print-out is possible.

Test requirements:
^ Selector lever in "P" and parking brake engaged.
^ Battery voltage OK.
^ Supply voltage and fuses for respective systems OK

^ Ground (GND) connections for transmission OK.
^ Check GND connections for corrosion and damage, repair as necessary.
^ Check battery GND strap and GND strap between battery and transmission.
- Switch off ignition.
- Connect OBD Tester and Information System VAS 5051 with adapter cable VAS 5051/1. As an alternative connect V.A.G 1551 Scan Tool (ST) with adapter cable V.A.G 1551/3.

Note: The Data Link Connector (DLC) is located in the front Left knee bar.





CAUTION:
^ Always secure VAS 5051 or V.A.G 1551 on the rear seat. A second technician using a safety belt is needed to operate the equipment from there.
^ Always observe Safety Precautions

Note: The following procedure is based on using the VAG 1551 Scan Tool (ST). When using the OBD Tester and Information System VAS 5051, follow the operating instructions.

- Switch on ignition.

Note: If nothing is shown on the display, check the power supply to the DLC.

^ You can get additional operating instructions by pressing the HELP button on the V.A.G 1551.
^ Use the button to advance through the program sequence.
see V.A.G 1551 Operating Instructions
^ In function 1 "Rapid data transmission", the automatic test sequence (buttons 00J can be performed.. In this function all control modules of the vehicle are automatically checked.
See V.A.G 1551 Operating Instructions





Indicated on display:
1) Operating modes 1 and 2 appear alternately
- Press brake pedal once
- Switch on printer with PRINT button (light in button lights up)
- Press button -1- for "Rapid data transfer".





Indicated on display:

Note: After entering address word 00 and confirming with the Q button, the automatic test sequence can begin (DTC memory for every system is checked)

The DTCs stored in memory will be displayed and printed out one after the other.





Indicated on display:
1) Operating modes 1 and 2 appear alternately
- Press button -1- for mode "Rapid data transfer".





Indicated on display:
- Press buttons 0 and 2 to enter address word "Transmission Electronics".





Indicated on display:
- Press Q button to confirm input.





Indicated on display:
Displayed are the control module identification, the control module code and the operating number of the V.A.G 1551 Scan Tool (ST).

Transmission Control Module (TCM) identification
The TCM identification depends on the manufacturer's status (data status). A control module identification may appear that is different than that in the example.

Example:





Indicated on display:
4B0927156BA Part number
AG5 01 L Automatic transmission 5 speed 01L
4.2l 5V Engine type 4.2 liter 5 valves
USA Market: USA
1214E PROM (data status)
Code 00002 Code: USA all wheel drive
WSC 01268 Dealership code of V.A.G
1551 Scan Tool with which last coding was done.

CAUTION: Part numbers shown here are for reference only. Always check with your parts department for latest information





Indicated on display:
- A list of possible malfunction causes can be printed out by pressing the HELP button.
- After eliminating possible malfunction causes again enter address word 02 for "Transmission Electronics" and confirm by pressing the "Q" button.
If again "Control module does not answer" is displayed:





Indicated on display:
Check voltage supply to control module:
- Perform test step 1, Electrical testing.
- Check wiring connection to DLC
- DTC table, under fault identifier numbers:
16987 / P0603 Control module faulty
16989/ P0605 Control module faulty
18156 / P1748 Control module faulty
- Press (arrow) button.





Indicated on display:
- After pressing the HELP button, a list of possible functions is printed out.








On Board Diagnostic (OBD), available functions using VAG 1551 Scan Tool (ST)

Other functions, which are printed out after the HELP button is pressed do not need to be considered.
The VAG scan tool returns to the "Select function" mode after each function was activated.





Indicated on display: