Checking Control Unit Coding

The VAG 1552 scan tool can be used instead of the VAG 1551, however no printout is possible.

Test Requirements:
- Battery Positive Voltage (B+) OK
- Supply voltage and fuses for respective system OK
- Ground (GND) connectors for transmission OK:
Check GND connections for corrosion and damage and repair if necessary.
Check TCM GND connection per wiring diagram.
Check battery GND strap and GND strap between battery and transmission.
- Selector lever in "P" position
- Parking brake applied
- Ignition switched off

NOTES:
- If nothing is shown on the display check the power supply to the DLC.
- Additional operating instructions can be obtained by pressing the HELP button on the VAG 1551 scan tool.
- Press the -> button to advance through the program sequence. => VAG 1551 scan tool operating instructions




Procedure:
- Remove cover for 16-pin Data Link Connector (DLC) to left of steering column.
- Connect VAG 1551 (VAG 1552) scan tool to DLC using adapter cable VAG 1551/3.
Indicated on display 1):

V.A.G. - On Board Diagnostic HELP
1 - Rapid data transfer
2 - Blink code output

1) Operating modes 1 and 2 are displayed alternately

- Switch ignition on.
- Operate brake pedal one time.
- Press PRINT button to switch printer on (indicator light in button comes on).
- Press button -1- to select "Rapid data transfer" operating mode 1.
Indicated on display:

Rapid data transfer HELP
Insert address word XX

NOTES:
- After address word 33 is inserted and confirmed with the -Q- button, the OBD program can begin. OBD functions => Testing and Inspection
- After address word 00 is inserted and confirmed with the -Q- button, the automatic test sequence can begin (the DTC memory for every system is checked). Stored malfunctions are displayed in sequence and printed out.
Indicated on display 1):

V.A.G. - On Board Diagnostic HELP
1 - Rapid data transfer
2 - Blink code output

1) Operating modes 1 and 2 are displayed alternately

- Press button -1- to select "Rapid data transfer" operating mode 1.
Indicated on display:

Rapid data transfer HELP
Insert address word XX

- Press buttons -0- and -2- to insert "Transmission Electronics" address word 02.
Indicated on display:

Rapid data transfer Q
02 Transmission Electronics

- Press -Q- button to confirm input.

Indicated or display (control module identification):

8D0927156N AG5 01V 3,71 2V US D74
Coding 00000 WSC 12345

TCM Identification:
The transmission control module identification is dependent on manufacture status (data status). A control module identification may appear which is different than that in this example.

Example:

8D0927156N Part number
AG5 01V Automatic transmission 5 speed 01V
3.71 2V Engine type: 3.7 liter 2 valve
US Market: USA
D74 EPROM (data status)
Coding 00000 Code: USA
WSC 12345 Dealership code of VAG 1551 scan tool with which last coding was carried out

CAUTION: Part numbers are listed here for reference only. Always check with your Parts department for the latest information.




If "Control module does not answer" is indicated on display:
- A list of the possible malfunction causes can be printed out by pressing the HELP button.

After eliminating possible malfunction causes:
- Again press buttons -0- and -2- to insert "Transmission Electronics" address word 02.




If "Control module does not answer" is again indicated on display:
- Check power supply by conducting electrical test step 1. Testing and Inspection
- Check wiring connection to DLC.
- Check DTC table; DTC 65535, "Control Module Malfunctioning". [1][2][3]Engine Control System
- Press -> button.
Indicated on display:

Rapid data transfer HELP
Insert address word XX

- A list of the possible functions can be printed out by pressing the HELP button.