Valve Body

Valve Body






1 Converter clutch switch valve

2 Low/Reverse switch valve

3 Solenoid switch valve

4 DC switch valve

5 LC switch valve

6 Manual valve

7 Pressure regulator valve

8 Torque converter regulator valve

9 Converter clutch control valve

Pressure Regulator Valve

The pressure regulator valve (7) controls hydraulic pressure in the transaxle. It receives unregulated pressure from the pump, which works against spring tension to maintain oil at specific pressures. A system of sleeves and ports allows the regulator valve to work at one of three predetermined pressure levels. Regulated oil pressure is also referred to as "line pressure."

Solenoid Switch Valve

The solenoid switch valve (3) controls line pressure from the low/reverse converter clutch solenoid. In one position, it allows the L/R clutch to be pressurized. In the other, it directs line pressure to the converter control and converter clutch valves.

Manual Valve

The manual valve (6) is operated by the mechanical shift linkage. Its primary responsibility is to send line pressure to the appropriate hydraulic circuits and solenoids. The valve has three operating ranges or positions.

Converter Clutch Switch Valve

The main responsibility of the converter clutch switch valve (1) is to control hydraulic pressure applied to the front (off) side of the converter clutch piston. Line pressure from the regulator valve is fed to the torque converter regulator valve, where it passes through the valve, and is slightly regulated. The pressure is then directed to the converter clutch switch valve and to the front side of the converter clutch piston. This pressure pushes the piston back and disengages the converter clutch.

Converter Clutch Control Valve

The converter clutch control valve (9) controls the back (on) side of the torque converter clutch. When the powertrain control module/transmission control module energizes or modulates the LR/CC solenoid to apply the converter clutch piston, both the converter clutch control valve and the converter control valve move, allowing pressure to be applied to the back side of the clutch.

Torque Converter (T/C) Regulator Valve

The T/C regulator valve (8) slightly regulates the flow of fluid to the torque converter.

Low/Reverse Switch Valve

The L/R clutch is applied from different sources, depending on whether low (1st) gear or reverse is selected. The low/reverse switch valve (2) alternates positions depending on from which direction fluid pressure is applied. By design, when the valve is shifted by fluid pressure from one channel, the opposing channel is blocked. The switch valve alienates the possibility of a sticking ball test, thus providing consistent application of the low/reverse clutch under all operating conditions.