Grand Caravan V6-3.3L VIN R (2005)
Valve Body: Description and Operation
40TE Automatic Transaxle
VALVE BODY
DESCRIPTION
The valve body assembly consists of a cast aluminum valve body, a separator plate, and transfer plate. The valve body contains valves and check balls
that control fluid delivery to the torque converter clutch, solenoid/pressure switch assembly, and frictional clutches. The valve body contains the
following components (Fig. 306):
^
Regulator valve
^
Solenoid switch valve
^
Manual valve
^
Converter clutch switch valve
^
Converter clutch control valve
^
Torque converter regulator valve
^
Low/Reverse switch valve
In addition, the valve body also contains the thermal valve, #2, 3 & 4 check balls, the #5 (overdrive) check valve and the 2/4 accumulator assembly.
OPERATION
NOTE: Refer to the Hydraulic Schematics for a visual aid in determining valve location, operation and design.
REGULATOR VALVE
The regulator valve 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 controls line pressure from the LR/CC solenoid. In one position, it allows the low/reverse clutch to be pressurized. In the
other, it directs line pressure to the converter control and converter clutch valves.
MANUAL VALVE
The manual valve 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.
