P0722 (Porsche Codes 36 and 90)

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

P0722:

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.

Part 1:

Part 2:

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