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Home >> Lexus >> 2009 >> ES 350 >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transaxle System (Diagnostic Codes & Circuit Tests) >> Automatic Transaxle System >> DTC P0715: Input / Turbine Speed Sensor Circuit Malfunction; DTC P0717: Input Speed Sensor Circuit No Signal >> System Description

System Description

This sensor detects the rotation speed of the turbine which shows the input revolution of transaxle. By comparing the input turbine speed signal (NT) with the counter gear speed sensor signal (NC), the TCM 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 Counter Gear, Input Speed Sensor, Output Speed Sensor And Clutch Drum
GTY127658Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DTC No. DTC Detection Condition Trouble Area
P0715 When the speed sensor input voltage is either more than 1.9 V or less than 0.1 V for 4.5 seconds or more.
  • Transmission revolution sensor (speed sensor NT)
  • TCM
P0717 ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more (1-trip detection logic):
(a) Vehicle speed: 31 mph (50 km/h) or more
(b) Park/neutral position switch (STAR and R) is OFF
(c) Speed sensor (NT): less than 300 rpm