Reading Diagnostic Trouble Codes

DIAGNOSABLE TIPTRONIC CONTROL UNIT
A self-diagnosis feature with fault memory is built into the Tiptronic control unit to allow certain faults within the electronic control system of the Tiptronic to be detected and to be stored.

To prevent detected and stored faults from being erased when the ignition is switched off, a permanent positive voltage is present at the control unit. Detected faults remain stored in the fault memory for at least 50 starts of the engine.

CAUTION: If the connector is pulled off the Tiptronic control unit or if the battery is disconnected, the fault memory is erased.

TESTER CONNECTIONS
To run the diagnosis, the vehicles are fitted with a 19-pin connector in the passenger footwell.

This connector allows System Tester 9288 or the Flashing Code Tester 9268 (via adapter cable 9268/2) to be connected. Operation of the testers is described in the tester instruction manuals.

NOTE: The relevant test point is complemented by the corresponding fault flasher code of Tester 9268. As of tester module level 4.0, the following items can be checked or read out with System Tester 9288:

Input signals with "Input signals" menu:
- Kickdown
- Downshift
- Upshift
- Manual program
- Selector lever

Actual values with "Actual values" menu:
- Rpm
- Speed 1
- Speed 2
- Injection time
- Throttle
- Temperature
- Transverse acceleration
- Selector lever switch
- Gear
- Voltage supply
- Version coding

Actuators (Drive links) with ,"Drive links" menu:
- Solenoid valve 1
- Solenoid valve 2
- Torque converter clutch
- Gear indicator 1 - 4
- Reverse relay (G 01)
- Ignition timing change