Forward (1, 2, 3, 4) Clutch Hydraulic Circuits (Applied in 1st, 2nd, 3rd and 4th gear)
The forward clutch is released when the manual valve is in the NEUTRAL, REVERSE or PARK position or the when the manual valve is in the DRIVE position with the transmission in 5th or 6th gear.
To release the forward clutch, the SSA lowers pressure to the clutch A regulator and the clutch A latch valve. This blocks the regulated line pressure in the CL A circuit to release the forward clutch.
In 2nd, 3rd, 4th, 5th and 6th gear, the D2 Latch valve directs exhaust circuit pressure from the CL EXH circuit to the CL A circuit to fill the circuit and the forward clutch with fluid at low pressure, approximately 21 kPa (3 psi). This keeps air out of the Clutch A circuits resulting in smooth shifts when the clutch is applied during a downshift into 4th gear.