Frontier SC King Cab 2WD V6-3.3L SC (VG33ER) (2002)
Torque Converter Clutch Solenoid: Description and Operation
System Description
The ECM controls torque converter clutch solenoid valve to cancel the lock-up condition of A/T. When the solenoid valve is turned on, lock-up is
cancelled. When the solenoid valve is turned off, A/T lock-up is operational.
Conditions for lock-up cancel:
Torque converter clutch solenoid valve is turned "ON" when;
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Throttle valve is fully closed (during idling or deceleration)
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Engine coolant temperature is below 40 °C (104 °F)
-
Engine is stopped
Conditions for lock-up operation:
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Under 55 to 63 km/h (34 to 39 MPH) (2/8 throttle on flat road), lock-up does not operate even when the torque converter clutch solenoid valve is
"OFF".
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Over 58 to 66 km/h (36 to 41 MPH) (2/8 throttle on flat road), lock-up should operate because the torque converter clutch solenoid valve is
"OFF".
To confirm vehicle lock-up, the torque converter clutch solenoid valve must be in operation ("ON" during idle and deceleration, and "OFF" during
acceleration) and engine speed should drop. When the accelerator pedal is depressed (less than 2/8) in lock-up, the engine speed should not change
abruptly. If there is a big jump in engine speed, there will be no lock up.