Possible causes, elimination, notes
NOTE:
The gear selection monitor for 2nd to 5th gears monitors the ratio of engine speed/output drive speed. In the case of deviations from nominal values, the Tiptronic control module detects whether shifting was performed mechanically or hydraulically.
If no other faults are stored, there is a mechanical/hydraulic fault in the transmission.
The following procedure can be used to check whether the transmission actually shifted to the correct gear in each case:
- ATF temperature between 40 °C and 95 °C.
- Hold gears 2 ... 5 in the manual gate.
- Drive at a constant vehicle speed on level ground (not on the roller test stand) and read off the engine speed.
The following values must be achieved during this test:
GEAR - SPEED - RPM VALUES
| Speed | Engine rpm | ||
|---|---|---|---|
| Speedom. Indication | Tester display | Nmin ... Nmax | |
| 2nd gear | 50 km/h | 45 km/h | 3300 ... 3700 |
| 3rd gear | 60 km/h | 55 km/h | 2800 ... 3200 |
| 4th gear | 70 km/h | 65 km/h | 300 ... 2700 |
| 5th gear | 80 km/h | 74 km/h | 1900 ... 2200 |