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Home >> Toyota >> 2001 >> Corolla CE, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Automatic Transmission Diagnosis - U140E & U140F) >> Diagnostic Tests >> DTC P1725: Input Turbine Speed Sensor Circuit Malfunction (CAMRY, Highlander & RAV4) >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Toyota RAV4, 2002 Toyota Highlander, 2002 Toyota Camry, 2002 Lexus RX 300, and 2001 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

Input turbine speed sensor detects rotation speed of input shaft. By comparing input turbine speed sensor signal and counter gear speed sensor signal, ECM detects shift timing of gears and controls engine torque and hydraulic pressure in response to various conditions to ensure smooth transaxle shifting. DTC will set if ECM detects vehicle speed of 20 MPH or more, transaxle is in 2nd, 3rd or OD gear, shift solenoids and PNP switch status is normal, and input shaft speed is less than 300 RPM. Possible causes are: