DTC P0722: Output Speed Sensor Circuit No Signal [04/2013 - 08/2015]: Description

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. 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	No transmission revolution sensor (SP2) signal to the ECM under the following conditions: (2-trip detection logic) (a) Park/neutral position switch assembly (P and N) is OFF (b) Vehicle speed is 5.59 mph (9 km/h) or more	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.

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