Transmission Component and System Description: Notes

Based on the hydraulic pressure created by the oil pump, the hydraulic control system governs the hydraulic pressure acting on the torque converter, clutches, and brakes in accordance with the vehicle condition.

There are five solenoid valves on the valve body.

• The S1 and S2 solenoid valves are turned on and off by the TCM to operate the shift valves, which change the gear positions.
• Neutral control is operated by switching on the SN solenoid.
• The SLT solenoid valve is operated by signals from the TCM to the hydraulic pressure for the clutches and brakes to reduce shock.
• The SLU solenoid valve modulates lock up on and off pressure in the torque converter by control signals from the TCM. The SLU also controls active pressure to the lock up clutch and creates perfect up shift feel.