Circuit Operation

The input shaft speed sensor generates 0 <==> 5 volts pulse signal when the input shaft rotates. The pulse signal frequency increases with a rise in input shaft speed.
The input shaft speed sensor is connected to the PCM (terminals 16 and 103) via the input shaft speed sensor connector (terminals 1 and 2).
The PCM detects the input shaft speed by the signal input to terminal 103.
The input shaft speed sensor generates the pulse signal as the teeth of the underdrive clutch retainer pass the magnetic tip of the sensor.

Fig 1: A/T Fluid Temperature Sensor System Circuit Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Identifying A/T Fluid Temperature Sensor System Connectors

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.