Acura 3.5 RL Manual page 499

Position
4. 4th Gear
As the speed of the vehicle reaches the prescribed value, shift solenoid valve A is turned OFF by means of the PCM.
Shift solenoid valve B remains OFF. The modulator pressure (6A) flows to the right end of the 3-4 shift valve and the
left end of the 1-2 shift valve. The modulator pressure (6A) in the left end of the 1-2 shift valve equals the modulator
pressure (6B) in the right end of the 1-2 shift valve, so the 1-2 shift valve remains in the left side by the tension of the
valve spring. The 3-4 shift valve is moved to the left side by modulator pressure (6B). The 3-4 shift valve covers the port
leading to the 3rd clutch and uncovers to the 4th clutch as this valve is moved to the left side. The line pressure (5')
from the 2-3 shift valve becomes the 4th clutch pressure (40) at the 3-4 shift valve. The 4th clutch pressure (40) is
applied to the 4th clutch, and the 4th clutch is engaged.
Hydraulic pressure also flows to the 1st clutch and 2nd clutch. However, no power is transmitted because of the one-
way clutches.
NOTE:
• When used, "left" or "right" indicates direction on the hydraulic circuit.
• The hydraulic circuit is for '96 - '98 models. On '99 - 01 models, the 2nd accumulator is different.
THROTTLE VALVE