Test Point 15

TEST POINT 15
Stall Speed, Transmission Input Signal Implausible

DTC 91

Fault Effect: Reduced driving program.

Note:
The ratio of transmission input speed/engine speed is monitored.

1. Test sender for the transmission input speed on Tiptronic control module connector pin 16 and pin 44 with an ohmmeter.

Nominal value: 230 - 300 ohms

2. Check wiring from control module pin 16 (or 44) to the 1~pole transmission connector pin 5 (or 6) for open circuit, short to ground and short to B+.

3. Check shield on control module connector pin 23.

4. Check sender on transmission socket pin 5 and pin 6 with an ohmmeter.

Nominal value: 230 - 300 ohms

Note:
The hydraulic control unit must be removed before the sender can be replaced.

5. If items 1 - 4 are OK and no other faults are stored there is a mechanical/hydraulic fault in the transmission (e.g. ATF level not OK, defective converter, slipping clutches or brakes.)