DTC P0500 Vehicle Speed Sensor "A": Description

The speed sensor SP2 detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the speed sensor SP2 coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the ECM. The parking gear on the rear planetary gear is used as the timing rotor for this sensor.

The gear shift point and lock-up timing are controlled by the ECM based on the signals from this vehicle speed sensor and the throttle position sensor signal.

Fig 1: Identifying Input Speed Sensor NT, Output Speed Sensor SP2 & Parking Gear

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Reference (Using an oscilloscope):

Check the waveform between terminals SP2+ and SP2- of the ECM connector.

Fig 2: Checking Waveform Between Terminals SP2+ & SP2- Of ECM Connector

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Standard: 

Refer to the illustration.