Fluid Pressure Directed in Preparation for a Shift

VFS Line Solenoid G 

VFS line solenoid G is energized allowing LINE fluid to enter the LINE VFS fluid circuit. LINE VFS fluid is routed to the ETRS mode enable valve, line VFS accumulator, and pressure regulator valve.

ETRS Mode Enable Valve 

LINE VFS fluid is routed to the ETRS mode enable valve applying pressure against ETRS mode enable valve spring force. This allows LINE fluid to be directed into the RANGE FEED fluid circuit. RANGE FEED fluid is then directed to the mode 1 ETRS valve, VFS S 4 solenoid D, and VFS S 3-8 solenoid C.

Mode 1 ETRS Valve 

RANGE FEED fluid is routed to the mode 1 ETRS valve and into the FEED 0 fluid circuit.

Mode 2 ETRS Valve 

FEED 0 fluid is routed to the mode 2 ETRS valve and into the PARK ON fluid circuit. PARK ON fluid is directed to the ball check valve #14 and #15.

Ball Check Valve #14 

PARK ON fluid is routed to the ball check valve #14. The ball check valve is seated by PARK ON fluid pressure.

Ball Check Valve #15 

PARK ON fluid is routed to the ball check valve #15 applying pressure against the ball check valve spring force.

Park Release Servo Piston 

PARK ON fluid is directed past ball check valve #15 and into the park release servo piston assisting with park release servo piston spring force to keep park engaged.

1-2-3-4-5-6 Regulator Valve 

The 1-2-3-4-5-6 solenoid is energized which applies pressure against the 1-2-3-4-5-6 Regulator Valve spring force. This allows drive fluid to be blocked from entering the 1-2-3-4-5-6 CLUTCH REG fluid circuit.