DTC P0717: Turbine Speed Sensor Circuit No Signal: Description

WARNING: This page is about a different car, the 2010 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 revolution of transmission. By comparing the input turbine speed signal (NT) with the counter gear speed sensor 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 shift.

Fig 1: Identifying Vehicle Speed Sensor

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DTC No.	DTC Detection Condition	Trouble Area
P0717	ECM detects conditions (a), (b) and (c) continuity for 5 sec. or more: (1-trip detection logic) (a) Output shaft speed is 300 rpm or more (Vehicle speed: 50 km/h (31 mph) or more) (b) Park/neutral position switch: * R input signal is OFF (c) Speed sensor (NT): less than 300 rpm	Open or short in speed sensor (NT) circuit Speed sensor (NT) ECM Automatic transmission (clutch, brake or gear, etc.)

Reference (Using an oscilloscope):

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

Fig 2: Identifying Oscilloscope Voltage Waveform Signal

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)