Test Point 14 - Speed Sensor, Transmission
TEST POINT 14 - Speed sensor (transmission) - The sensor transmits the transmission speed. ECU compares it to the wheel speed. - Fault code 36Possible Causes, Elimination, Remarks
Tiptronic warning lamp comes on, transmission is in emergency mode.
Possible faults: Open circuit, short to ground, short to positive, loose connection
NOTE: Check with Tester 9288 (actual values). Store fault as of engine speed = 2800 rpm
1) Pull connector off ECU
a) Measure resistance between pin 2 and pin 38. Nominal value approx. 350 Ohms
b) Check that pin 2 and pin 38 are free from shorts to ground.
- Check o.k.: ECU faulty
2) Also pull off connector from transmission. Check for continuity at ECU connector pin 2 to pin A Pin 38 to pin F Short to ground pin 2andd pin 38 to pin 7 (ground) Pin 2 and pin 38 to pin 20 (screening) Short to positive pin 2 and pin 38 to pin 1 (positive)
NOTE: If it is to be assumed that intermittent faults linked to the output speed occur, the screening connection at pin 20 should be checked after opening the connector housing.
Wiring o.k.: Check sensor and wiring in transmission
Possible transmission faults: Oil strainer clogged, air intake it oil starvation occurs etc., power transmission interrupted.