Third Gear (D Range): Operation

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With shift solenoids A and C OFF, spring force is applied to upper end of shift valve A, and shift valve C is position on the lower side.
With shift solenoid B ON, pilot pressure is applied to the bottom end of shift valve B, and the shift valve B is positioned on the upper side.
Line pressure is applied to the low clutch accumulator, and the engages the low clutch through the shift valve B.
Line pressure is applied to the high clutch accumulator, and engages the high clutch through shift valve C and shift valve A.
Line pressure delivered to the pressure regulator valve is sent to the torque converter through the TCC control valve as torque converter pressure.

Fig 1: Identifying Third Gear (D Range) Line Pressures
Courtesy of MAZDA MOTORS CORP.