Manufacturer Codes: 73

Fault, DTC's 72, 73, 74, 75 Test Point 17

Gear sel. monitor, 2nd, 3rd, 4th, and 5th gear
Signal implausible

Possible causes, elimination, notes

Fault effect:
Reduced driving program.

NOTE: In gear selection monitoring of 2nd to 5th gear, the ratio of engine speed/output shaft speed is monitored. 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:
- The ATF temperature must be between 40 degrees C and 95 degrees 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: