Automatic transmission cooling temperature sensor
Purpose:
The automatic transmission cooling temperature sensor (automatic transmission) measures the temperature of the transmission fluid in the automatic transmission and transmits this signal to the electronic control unit (ECU).
Working principle:
* The sensor consists of a resistor whose value changes depending on the temperature.
* When the transmission fluid temperature rises, the resistance of the sensor resistor decreases.
* The ECU receives a signal from the sensor and regulates the operation of the automatic transmission in accordance with the fluid temperature.
Functions:
* Overheat protection: The ECU uses information about the fluid temperature to prevent overheating of the automatic transmission. When the set temperature is reached, the ECU may turn on additional cooling or limit the transfer of power to the wheels.
* Gear shifting: The ECU uses fluid temperature information to optimize gear shifting. At higher temperatures, the ECU may shift gears earlier to prevent overheating.
* Diagnostics: The ECU uses the temperature sensor readings to diagnose problems with the automatic transmission cooling system. If the sensor is faulty, the ECU may issue a fault code.
Location:
The automatic transmission cooling temperature sensor is usually located in the automatic transmission housing or in the coolant line. Its exact location may vary depending on the specific model and make of the car.
Malfunctions:
* Faulty sensor: The sensor can fail and produce incorrect temperature readings, which can lead to overheating or other problems with the automatic transmission.
*Damaged Wiring: The wiring connecting the sensor to the ECU may be damaged, causing signal loss.
*Cooling Problems: Problems with the radiator, pump, or other cooling system components can cause the fluid temperature to rise and cause the sensor to trip.