Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

This sensor detects the rotation speed of the O/D input shaft from the rotation of the O/D direct clutch drum.

Its mechanism is the same as that of the vehicle speed sensor (See CIRCUIT INSPECTION ).

By comparing the O/D direct clutch speed signal with vehicle speed sensor signal, the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure in response to various conditions, thus doing smooth gear shift.

Fig 1: Identifying O/D Direct Clutch Drum

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DTC CONDITION DETECTION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0717	All conditions below are detected for 5 secs. or more(1-trip detection logic) Gear change not being performed Gear position: 1st, 2nd, 3rd, 4th or 5th T/M input shaft rpm: 300 rpm or less T/M output shaft rpm: 500 rpm or more Park/neutral position switch: OFF Shift solenoid valves, park/neutral position switch and vehicle speed sensor are in normal operation	Open or short in O/D direct clutch speed sensor (NCO) circuit O/D direct clutch speed sensor (NCO) ECM Automatic transmission assembly

Refer to the chart for the waveform between terminals NCO⁺ and NCO^- during engine idling.

Fig 2: Identifying Waveform