Circuit Description

The No. 2 vehicle speed sensor 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 No. 2 vehicle speed sensor coil as the rotor mounted on the output shaft rotates, and this voltage is sent to the ECM. 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. If the No. 2 vehicle speed sensor malfunctions, the ECM uses input signals from the ABS speed sensors as a back-up signal.

Fig 1: Identifying Output Speed Sensor & Its Circuit Description

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Fig 2: DTC P0722 Detection Condition & Trouble Area Chart

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HINT:

The waveform between terminals SP2+ and SP2-when the vehicle speed is approximately. 60 km/h (37 mph) is shown on the left.

Fig 3: Output Speed Sensor Waveform