Honda Acura NSX 1991 Service Manual page 425

The flow of fluid through the torque converter circuit is the same as in the INI . The fluid (1) from the oil pump flows
through the manual valve and becomes the line pressure (3). It then flows through the 1-2 shift valve to the servo valve
Under this condition, the shift control solenoid valve A is turned ON and the valve B is turned OFF as in 3rd speed. As
a result, the 1-2 shift valve is also moved to the left side. The fluid (3)' will flow through the servo valve and manual
valve to the 4th clutch; power is transmitted through the 4th clutch.
Reverse Inhibitor Control
When them position is selected while the vehicle is moving forward at a speed over 6 MPH, the control unit outputs
1st signal (A: OFF, B: ON), the l-2 shift valve is moved to the right side. The line pressure (3) is intercepted by
the l-2 shift valve, consequently the power is not transmitted as the 4th clutch and servo valve are not operated.
NOTE: When used, "left" or "right" indicates direction on the flow chart.
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