4th Clutch Applies

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

S4 Solenoid

The S4 solenoid is energized allowing line fluid to enter the S4 VFS SIG fluid circuit. S4 VFS SIG fluid is directed to the 4th clutch regulator valve.

4th Clutch Regulator Valve

S4 VFS SIG fluid is directed thru orifice #13 and into the 4th clutch regulator valve where it applies pressure against the 4th clutch regulator valve spring force. This allows DRIVE 2 fluid to enter the 4TH CLUTCH fluid circuit. 4TH CLUTCH fluid is directed thru orifice #34 and to the 4^th clutch accumulator and 4^th clutch assembly.

4th Clutch Accumulator

4TH CLUTCH fluid is directed thru orifice #34 and into the 4th clutch accumulator where it applies pressure against the 4th clutch accumulator spring force.

4th Clutch Assembly

4TH CLUTCH fluid is directed to the 4th clutch assembly. 4TH CLUTCH fluid moves the piston against spring force to apply holding of the 4th clutch plates.