T_SUMP_MALFUNCT_ADC_ABOVE; Transmission oil sump temperature sensor; Voltage above upper limit
Switch off ignition; Disconnect electronics; Connect transmission test cable; Measure resistance of the temperature sensor (pin 4) against the sensor ground terminal (pin 15); Nominal value: 20°C ->approx. 62.3 kohm, 80°C ->approx. 6.3 kohm, 140°C -> approx. 1.2 kohm; For additional values, see temperature sensor data sheet; Check cable TCU -> transmission; Note: The voltage at the PIN can not be used because the voltage is split internally; If you find deviations from the nominal value, check wiring and component;
What you'll see
No driver-visible symptom recorded.
System reaction
Deactivate Neutral Standby;Deactivate Automatic Idle Shift;Deactivate shifting pressure adaption and use last adaption values;Reduced engine torque;Switch to duty cycle signal Limp Home from Shift Console;
Diagnostic depth
ADC value cold > 968, corresponds to <-40°C; Normal mode
Increased fuel consumption Reduced driving performance Reduced retarder braking performance;