Tiptronic System G50

P0722 (Porsche codes 36 and 90)

Speed sensor - signal implausible
Transmission output speed monitoring - signal implausible

Function
The transmission output speed/engine speed ratio or transmission input speed/transmission output speed ratio is monitored.
The "reduced driving programme" is activated if the signal is incorrect.

Diagnosis conditions
- Selector lever position "D", Gear 2, 3, 4 or 5
- ATF temperature > 60 °C
- Engine speed > 3104 rpm






Wiring diagram






Transmission speed sensor






Transmission input speed sensor

Diagnosis procedure

NOTE: If the faults described in the diagnosis procedure were remedied and no other faults are stored, there might be a fault in the torque converter or transmission.









1 Check sensor for transmission speed with wiring.
1. Remove Tiptronic control module connector.
2. Connect ohmmeter to Tiptronic control module connector pin 14 and pin 42.
Display: 0.80 ... 1.2 KOhms

2 Check sensor for transmission input speed with wiring.
1. Remove Tiptronic control module connector.
2. Connect ohmmeter to Tiptronic control module connector pin 16 and pin 46.
Display: 230 ... 300 Ohms