Hydraulic Flow (cont'd)
R Position: Driving in reverse gear
After starting off in reverse gear, the PCM turns shift solenoid valves A ON, and keeps B and E ON, and C and D OFF. Shift solenoid valve A port (SA) is applied to the right side of shift valve A to cover A/T clutch pressure control solenoid valve A pressure, and to uncover the port leading to the 4th clutch, creating full line pressure. The 4th clutch is engaged securely with line pressure.
Reverse Inhibitor Control
While the vehicle is moving forward, the PCM keeps shift solenoid valve E OFF. The shift valve E covers the port of line pressure (3') leading to the servo valve reverse position. The servo valve cannot be shifted to reverse position, and hydraulic pressure is not applied to 4th clutch from the servo valve for reverse; as a result, power is not transmitted to the reverse direction.
NOTE: When used, ‘‘left'' or ‘‘right'' indicates direction on the hydraulic circuit.
P Position
Shift solenoid valves B and E are turned ON, and A, C, and D turned OFF by the PCM. Line pressure (1) flows to the shift solenoid valves and the A/T clutch pressure control solenoid valve A. Line pressure (3) changes to (3') at the shift valve E, and flows to the servo valve. The servo valve is moved to reverse/park position. Hydraulic pressure is not applied to the clutches.