Maxima SE V6-3.0L (VQ30DE) (1998)
Relation between shift solenoid valves A and B and gear positions.
The shift solenoid valve performs simple ON-OFF operation. When set to ON, the drain circuit closes and pilot pressure is applied to the shift valve.
Pilot pressure generated by the operation of shift solenoid valves A and B is applied to the end face of shift valves A and B.
Control of shift valves A and B
The drawing above shows the operation of shift valve B. When the shift solenoid valve is ON, pilot pressure applied to the end face of the shift valve
overcomes spring force, moving the valve upward.
Lock-Up Control
LOCK-UP CONTROL
The torque converter clutch piston in the torque converter is locked to eliminate torque converter slip to increase power transmission efficiency. The
solenoid valve is controlled by an ON-OFF duly signal sent from the TCM. The signal is converted to oil pressure signal which controls the torque
converter clutch piston.
Conditions For Lock-Up Operation
When vehicle is driven in 4th gear position, vehicle speed and throttle opening are detected. If the detected values fall within the lock-up zone
memorized in the TCM, lock-up is performed.