Honda Acura NSX 1991 Service Manual page 423

3. 3rd Speed
The flow of fluid up to the l-2, 2-3 and 3-4 shift valves is the same as in the 2nd speed. As the speed of the car
reaches the prescribed value, the shift control solenoid valve B is turned OFF (Shift control solenoid valve A remains
ON). The 2-3 shift valve is then moved to the left side, uncovering the oil port leading to the 3rd clutch. Since the
3-4 shift valve is moved to the right side to cover the oil port to the 4th clutch, the 3rd clutch is engaged.
Fluid flows by way of:
-Line Pressure (4) + CPC Valve - Clutch Pressure Control (4') + l-2 Shift Valve - Clutch Pressure Control
(5) --t 2-3 Shift Valve - Clutch Pressure Control (5) -+ 3-4 Shift Valve - 3rd Clutch Pressure (31) + 3rd Clutch
The hydraulic pressure also flows to the 1st clutch. However no power is transmitted by means of the one-way
clutch as in the 2nd speed.
NOTE: When used, "left" or "right" indicates direction on the flow chart.
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