DTC P0717 Turbine Speed Sensor Circuit No Signal: Description

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This sensor detects the rotation speed of the input turbine. By comparing the input turbine speed signal (NT) with the counter gear speed sensor signal (NC), 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.

DTC DETECTION CONDITION REFERENCE

DTC No.	DTC Detection Condition	Trouble Area
P0717	ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more: (1-trip detection logic) Vehicle speed: 50 km/h (31 mph) or more Park/neutral position switch (NSW and R) is OFF Speed sensor (NT): less than 300 rpm	Open or short in transmission revolution sensor NT (speed sensor NT) circuit Transmission revolution sensor NT (speed sensor NT) ECM Automatic transaxle assembly

Fig 1: Turbine Speed Sensor Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reference (Using an oscilloscope):

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

Standard: Refer to the illustration.

TERMINALS REFERENCE CHART

Terminal	NT+ - NT-
Tool setting	5 V/DIV., 0.5 ms./DIV.
Vehicle condition	Vehicle speed 20 km/h (12 mph)