Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode (DTM)

The function "Crash output" is checked with Output Diagnostic Test Mode (DTM).

When airbags are ignited the central locking is switched to "unlock", the interior lights are switched "on" and the engine switched off.


NOTE:
- Before performing the Output Diagnostic Test Mode (DTM), switch central locking to "lock" (operate interior lock switch).
- Switch interior light switch to position "door contact".
- Start engine.
- After completing the Output Diagnostic Test Mode (DTM) the central locking controls are not active until the ignition has been switched off and on again.


- Connecting scan tool. Scan Tool Connecting and Initial Checks

Perform function "03 Output Diagnostic Test Mode (DTM)"

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press keys 0 and 3

Indicated on display:


Rapid data transfer Q
03 Output Diagnostic Test Mode (DTM)


- Confirm entry with the -Q- button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
Crash signal


The engine stops, the central locking must switch to "unlock" and the interior lights must switch "on".

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
END


- Press -> button.

During test and assembly work malfunctions can be recognized from other control units like e.g. plug disconnected. Therefore on completion the DTC memories of all control units must be checked and erased. To do this:

- Press key 0 twice for address word "Automatic test sequence" and confirm entry with -Q- button. The VAG 1551 transmits all known address words one after the other.

When a control unit answers with its identification the number of stored malfunctions appears on the display or "No DTC recognized".

Any system malfunctions that are stored will be displayed one after the other and printed out. The VAG1551 will then transmit the next address word.

Indicated on display 1)


VAG-ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer
2 - Blink code output


1) Operating modes 1 and 2 are displayed alternately


NOTE:
If a DTC is recognized:
- 1. Repair malfunction
- 2. Erase DTC memory (function 05).
- 3. Check DTC memory again (function 02).