P0722  Output Speed Sensor Circuit No Signal  Toyota/Lexus

Description:
The transmission revolution sensor (SP2) detects the rotation speed of the transmission output shaft and sends signals to the TCM. The TCM determines the vehicle speed based on these signals. An AC voltage is generated in the transmission revolution sensor (SP2) coil as the parking gear mounted on the rear planetary gear assembly rotates, and this voltage is sent to the TCM. 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 TCM based on the signals from this vehicle speed sensor and the throttle position sensor signal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0722	Output Speed Sensor Circuit No Signal	All conditions are met for 5 seconds or more (2-trip detection logic): (a) No signal from the transmission revolution sensor (SP2) is input to the TCM. (b) Vehicle speed is 9 km/h (5.59 mph) or more. (c) Park/neutral position switch is OFF.	·Open or short in transmission revolution sensor (SP2) circuit·Transmission revolution sensor (SP2)·TCM·Automatic transmission (clutch, brake, gear, etc.)	Comes on	DTC stored

Reference: Inspect using an oscilloscope.

Check the waveform of the TCM connector.Standard:

Terminal No. (Symbol)	Tool Setting	Condition	Specified Condition
C77-30 (SP2+) – C77-29 (SP2-)	2 V/DIV., 20 msec./DIV.	Vehicle speed 20 km/h (12 mph)	Refer to illustration

Wiring diagram:

Datalist:

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
SPD (SP2)	Output shaft speed (transmission revolution sensor (SP2))	Min.: 0 km/h (0 mph) Max.: 255 km/h (158 mph)	Vehicle stopped: 0 km/h (0 mph) (output shaft speed equal to vehicle speed)	–

Procedure:
1. Inspection transmission revolution sensor (SP2) installation

2. Inspection transmission revolution sensor (SP2)

3. Check harness and connector (transmission revolution sensor (SP2) – TCM)