Drive - 4th Gear

WARNING: This page is about a different variant/trim than selected.

Solenoids C, D, F, G and PISA are on. Solenoid G shuttles the mode enable valve to provide line pressure to transmission range control valves. The PISA is held on to prevent an unintentional parking pawl engagement if hydraulic pressure at the park servo is lost. Solenoid F prevents line pressure from entering the 1 Rev/6789C hydraulic circuit.
Solenoid C shuttles the transmission control valve 1 allowing line pressure to enter Feed 1 hydraulic circuit, which directs fluid to the transmission control valve 2. The transmission control valve 2 directs Feed 1 fluid to the Drive hydraulic circuit. The Drive fluid passes through Solenoid A and into the 123456C Clutch assembly.
Solenoid D is PWM in order to create a pressure high enough to shuttle the transmission range control valve 1 and 4^th Clutch regulator valve. This allows Drive fluid to enter the clutch selector valve, which directs Drive fluid into the Drive 2 hydraulic circuit. The 4^th Clutch Regulator valve directs Drive 2 fluid into the 4^th Clutch hydraulic circuit applying the 4C Clutch assembly.