Honda Acura NSX 1991 Service Manual page 418

Description
1 Position
The line pressure (I) becomes the line pressure (4), (18), (25) as it passes through the manual valve. Also, the line pressure
(1) goes to the modulator valve through the filter and becomes the modulator pressure (6). The modulator pressure (6)
is supplied to the l-2 shift valve and 2-3 shift valve.
The t-2 shift and 2-3 shift valves are moved to the left side because the shift control solenoid valve A is turned ON
and B is OFF by the A/T control unit.
The line pressure (18) is supplied to the 3-4 shift valve, and it is moved to the left side. The line pressure (4) is the 1 st
clutch pressure (IO), then the 1st clutch is engaged.
The line pressure (4) becomes the Ist-hold clutch pressure (16) via the 1-2 shift valve, 2-3 shift valve, 3-4 shift valve
and manual valve, then the Ist-hold clutch is engaged.
NOTE: When used, "left" or "right" indicates direction on the flow chart.