Tiptronic System G100, G101, G102, G110

P0715

NOTE:
- The speed sensors are housed in the electrical part of the hydraulic control unit.
- If a speed sensor is faulty, the complete electrical part of the hydraulic control unit must be replaced.

Supply voltage of speed sensors (outside tolerance)
The output voltage of the voltage regulator for the transmission sensors and solenoid valves is monitored. Malfunctions in the wiring, plug connections and the voltage regulator itself are detected.

Diagnostic conditions
- Ignition on

Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit
- Tiptronic control unit faulty

Affected pins
Plug A: Pin 13 and pin 33

Diagnosis/troubleshooting












Speed sensor n2 (or sensor supply interrupted)
This checks if the speed sensor signal n2 is present.

Diagnostic conditions
- Ignition on
- Engine speed > 450 min-1
- Vehicle speed > 30 km/h (18.75 mph)
- Straight ahead at constant speed

Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit
- Speed sensor n2 faulty
- Tiptronic control unit faulty

Affected pins
Plug A: Pin 12

Diagnosis/troubleshooting









Speed sensor n3
This checks if the speed sensor signal n3 is present.

Diagnostic conditions
- Ignition on
- Engine speed > 450 min-1
- Vehicle speed > 30 km/h (18.75 mph)
- Straight ahead at constant speed
- No gearshift active
- Transmission in third or fourth gear

Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit
- Speed sensor n3 faulty
- Tiptronic control unit faulty

Affected pins
Plug A: Pin 35

Diagnosis/troubleshooting









Speed comparison n2 with n3 implausible
This checks if the n2 sensor signal appears plausible compared with the n3 sensor signal. An error is detected if the speeds do not agree.

Diagnostic conditions
- Ignition on
- Engine speed > 450 min-1
- Vehicle speed > 30 km/h (18.75 mph)
- Straight ahead at constant speed
- No gearshift active

Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit
- Speed sensor n2 or n3 faulty
- Tiptronic control unit faulty

Affected pins
Plug A: Pin 12 and pin 35
Plug A: Pin 13 and pin 33

Diagnosis/troubleshooting