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. 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, Parking Gear And Speed Sensors

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. PNP switch is OFF Transfer position is not neutral (4WD)	Open or short in speed sensor SP2 circuit Speed sensor SP2 ECM Automatic transmission (clutch, brake or gear, etc.)

Reference: Inspect using an oscilloscope.

Check the waveform of the ECM connector.

Standard voltage: Refer to illustration.

STANDARD VOLTAGE SPECIFICATION

Item	Content
Tester Connection	E7-34 (SP2+) - E7-26 (SP2-)
Tool Setting	2 V/DIV., 2 msec./DIV
Condition	Vehicle speed 20 km/h (12 mph)

Fig 2: Waveform Graph (Waveform 5)