Forward (1, 2, 3, 4) Clutch Hydraulic Circuits (Released)
When the forward (1, 2, 3, 4) clutch is released in 5th and 6th gears, solenoid pressure from SSA is removed from the 1234 regulator and latch valves which positions the valves to block line pressure and release the forward (1, 2, 3, 4) clutch. When the forward (1, 2, 3, 4) clutch is released in the PARK, REVERSE or NEUTRAL position, line pressure is not supplied to the forward (1, 2, 3, 4) regulator valve.
In the released position, exhaust backfill supplied to the 1234 regulator and latch valves by the manual valve through the EXH BF circuit is directed to the forward (1, 2, 3, 4) clutch to fill the unused circuits with unpressurized transmission fluid.
For details on valve body hydraulic circuits and solenoid operation. For additional information, refer to: Transmission Description - System Operation and Component Description .