DTC P0717: Turbine Speed Sensor Circuit No Signal [06/2014 - 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.

This sensor detects the rotation speed of the turbine which shows the input shaft revolution speed. By comparing the input turbine speed signal (NT) with the counter gear speed signal (SP2), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. Thus, providing smooth gear shifts.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0717	Turbine Speed Sensor Circuit No Signal	ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more: (1-trip detection logic) (a) Output shaft speed is 1000 rpm or more (Vehicle speed: 50 km/h (31 mph) or more) (b) Park/neutral position switch assembly: P input signal is OFF NSW input signal is OFF R input signal is OFF (c) Transmission revolution sensor (NT): less than 300 rpm	Open or short in transmission revolution sensor (NT) circuit Transmission revolution sensor (NT) ECM Automatic transmission (clutch, brake or gear, etc.)	Comes on	DTC stored

Reference (Using an oscilloscope):

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

Standard

Refer to the illustration.

Terminal	NT+ - NT-
Tool setting	1 V/DIV., 2 ms./DIV.
Vehicle condition	Engine idle speed (P or N position)