ER1 sump temperature sensor failure low U < lower limit (corresponds to high temperature)
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;;;Switch to duty cycle signal Limp Home from Shift Console;
Diagnostic depth
ADC value hot < 0,323 V, corresponds to >175°C; Normal mode
Increased fuel consumption; Reduced driving performance; Reduced retarder braking performance;;