Hydraulic Flow (cont'd)
D Position: Driving in 4th gear
The PCM turns shift solenoid valves A ON, and keeps B, C, D, and E OFF. Shift solenoid valve A pressure (SA) is applied to the right side of shift valve A. Shift valve A is moved to the left side to cover the ports of A/T clutch pressure control solenoid valves A and C leading to the 2nd and 3rd clutches.
A/T clutch pressure control solenoid valve B pressure (56) changes to (5G) at the shift solenoid valve C, and becomes 4th clutch pressure (40) at the shift valve B. The 4th clutch pressure (40) is held high by A/T clutch pressure control solenoid valve B, and the 4th clutch is engaged securely.
NOTE: When used, ‘‘left'' or ‘‘right'' indicates direction on the hydraulic circuit.
D Position: Shifting between 4th gear and 5th gear
As the speed of the vehicle reaches the programmed value, the PCM turns shift solenoid valves D ON, and keeps A ON, and B, C, and E OFF. Shift solenoid valve D pressure (SD) in applied to the left side of the shift valve D. Shift valve D is moved to the right side to uncover A/T clutch pressure control solenoid valve C pressure to the 5th clutch. A/T clutch pressure control solenoid valve B pressure (56) changes to 4th clutch pressure (40) at shift valve B. A/T clutch pressure control solenoid valve C pressure (57) changes to (5L) at shift valve D and to (5N) at shift valve B, and becomes 5th clutch pressure (50) at shift valve A. The 4th and 5th clutches are engaged gently.
NOTE: When used, ‘‘left'' or ‘‘right'' indicates direction on the hydraulic circuit.