Shifting to D and S from N
When shifting to D or S from N, the condition of shift solenoid valves A and B remain the same as in N, and the manual valve moves to the D position. Line pressure (4) from the manual valve is applied to the shift valve C line pressure port (4) and the A/T clutch pressure control solenoid valves A pressure port (4) and B pressure port (4). As shift solenoid valve A is ON and shift solenoid valve B is OFF, the line pressure (4A) from shift valve A applies to the shift valve C line pressure port (4B) through shift valve B (4A, 4B). Shift valve C remains on the left side by the hydraulic pressure (4B) from shift valve B. Immediately after moving the shift lever to D or S from N, A/T clutch pressure control solenoid valve D operates to apply the A/T clutch pressure control solenoid valve D pressure (58) to the 1st clutch through lock-upshift valve pressure ports (58, 58'), shift valve C pressure ports (58', 3B), manual valve pressure ports (3B, 5A), and shift valve C pressure ports (5A, 10). A/T clutch pressure control solenoid valve D gently applies hydraulic pressure to the 1st clutch, which avoids generating shock while in gear.