This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC) with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriately controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shifting is performed.


DTC Detection Condition

Trouble Area


ECM detects conditions (a), (b) and (c) continuously for 5 sec. or more: (1-trip detection logic)

(b) Park/neutral position switch (STAR) is OFF

(c) Speed sensor (NC): less than 300 rpm

• Open or short in transmission revolution sensor NC (speed sensor NC) circuit

• Transmission revolution sensor NC (speed sensor NC)


Reference (Using an oscilloscope):

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

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Do It Yourself Car Diagnosis

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