Output Speed Sensor (OSS)
The output speed sensor (OSS) is a hall-effect type sensor. The OSS mounts to the transmission case below the control valve body assembly and connects to the control solenoid valve assembly through a wire harness and connector. The sensor faces the Park gear machined teeth surface. The Park gear rotates together with the output shaft.
Circuit/System Description - OSS
The TCM provides an 8.6 volt reference circuit and a signal circuit to the output speed sensor. As the park gear rotates, the sensor detects the change in the magnetic field as the park gear teeth pass the sensor. The sensor produces a signal frequency based on the rotational speed of the gear. The TCM uses the signal to determine output shaft speed. Output shaft speed is one of the inputs the TCM uses to determine correct line pressure, transmission shift patterns, torque converter clutch slip speed and gear ratio.