Output Shaft Speed Sensor

The Output Shaft Speed (OSS) sensor is a magnetic pick-up located on outside of transmission case, near parking gear. OSS sensor sends output shaft speed signal to PCM. OSS sensor is used for TCC control, shift scheduling and to determine electronic pressure control. If OSS sensor malfunctions, harsh engagements, firm shift feel or abnormal shift schedule may occur. Unexpected downshifts may occur at closed throttle. TCC will not engage.