Location of automatic transmission speed sensor on Chevrolet Captiva:
The automatic transmission speed sensor in the Chevrolet Captiva is located on the side of the transmission, next to the front axle drive shaft.
Sensor design and operating principle:
The sensor is a cylindrical device with a gear wheel that rotates with the automatic transmission shaft. The sensor uses an electromagnetic operating principle. When the teeth of the wheel pass the sensor, an electrical impulse is created in its winding. The frequency of these pulses corresponds to the speed of rotation of the automatic transmission shaft.
Purpose of the automatic transmission speed sensor:
The automatic transmission speed sensor transmits information to the electronic transmission control unit (TCM ECU) about the speed of rotation of the transmission input shaft. This information is used for:
* Determining the optimal gear shift moment.
* Pressure regulation in the automatic transmission hydraulic circuit.
* Ensuring torque converter locking.
* Diagnosis of faults in automatic transmission operation.