DTC P0722 Output Speed Sensor Circuit No Signal: 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 Clutch Drum, Output Speed Sensor SP2 And Input Speed Sensor NT Location

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0722	All conditions below are detected 500 times or more continuously (2-trip detection logic) No signal from speed sensor (SP2) is input to ECM while 4 pulses of No. 1 vehicle speed sensor signal are sent. Vehicle speed is 9 km/h (5 6 mph) or more for at least 4 sec. Park/neutral position switch is OFF. Transfer position is not neutral (4WD)	Open or short in speed sensor (SP2) circuit Speed sensor (SP2) ECM Automatic transmission assembly (clutch, brake or gear, etc)

Reference (Using an oscilloscope):

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

Fig 2: Identifying Waveform

Standard:

Refer to the illustration.

STANDARD REFERENCE

Terminal	SP2+ - SP2-
Tool setting	2 V/DIV, 20 ms/DIV
Vehicle condition	Vehicle speed 20 km/h (12 mph)