Speed Sensor - Output: Operation: Notes
The Output Speed Sensor provides information on how fast the output shaft is rotating. As the rear planetary carrier park pawl lugs pass by the sensor coil (Fig 1), an AC voltage is generated and sent to the PCM/TCM. The PCM/TCM interprets this information as output shaft RPM.
The PCM/TCM compares the input and output speed signals to determine the following:
- Transmission gear ratio
- Speed ratio error detection
- CVI calculation