"D" Range 4TH Gear

The line pressure, after acting on the manual valve, passes through the forward clutch accumulator and causes the forward clutch to engage. Furthermore, with the shift solenoid valve No. 1 turned OFF and the shift solenoid valve No. 2 ON, the 1 - 2 shift valve moves to the left as its left side is free from the line pressure and the 2 - 3 shift valve moves to the right as its left side is subject to the line pressure. As a result, the line pressure, after passing through the manual valve and acting on the 1 - 2 shift valve, passes through the valve and the 2nd and 4th brake modulator valve, works on the engagement side of the 2nd and 4th brake.

Also, the line pressure passing through the manual valve and acting on the 1 - 2 shift valve passes the 2 - 3 shift valve and overdrive clutch accumulator to cause the overdrive clutch to engage. When running at a constant speed, as the TCC control solenoid valve turns ON and the TCC control valve moves down, the hydraulic pressure coming from the primary regulator valve passes through the TCC control valve to operate the TCC.