Circuit 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 output shaft speed, the engine control module (ECM) detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. This provides smooth gear shift.

The ECM terminal 125 detects the transmission input shaft speed. The ECM determines the gear shift timing based on a comparison of the input speed sensor (input shaft speed) with the output speed sensor (output shaft speed). When the output shaft speed is higher than the expected value and the input shaft speed is 300 rpm or less while running with the shift lever in the D position, the ECM determines that there is a malfunction of the input turbine speed sensor (NT). The ECM illuminates the MIL and stores the DTC.