DTC P0722: Output Speed Sensor Circuit No Signal [09/2014 - 10/2015]: Description

WARNING: This page is about a different car, the 2017 Lexus RC 350, 2017 Lexus RC 300, 2016 Lexus RC 350, 2016 Lexus RC 300, and 2015 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.

The transmission revolution 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 transmission revolution 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 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	1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other Vehicle speed is 9 km/h (5.59 mph) or more, and the park/neutral position switch assembly (P and N) is OFF. No transmission revolution sensor (SP2) signal to the ECM 5 seconds 2-trip detection logic	Open or short in transmission revolution sensor (SP2) circuit Transmission revolution sensor (SP2) ECM	Comes on	DTC stored

Reference (Using an oscilloscope):

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

Standard

Refer to the illustration.

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