Millenia L V6-2.5L DOHC (1997)
The oil pressure regulator valve adjusts the line pressure generated by the oil pump to match driving conditions.
Line pressure (7) that is generated in the oil pump works on chambers (A) and (B). The line pressure applied to chamber (A) moves the pressure
regulator valves to the left side due to a difference between the surface areas of the two valves. Line pressure is then drained from chamber (C).
As a result, the pressure regulator valve balances at the point which the (A) chamber line pressure acting toward the left balances with the spring force
and modifier pressure (21) acting toward the right force.
The line pressure (7) that works on chamber (A) becomes torque converter pressure (23) which is sent into the torque converter through the lockup
control valve and lockup shift valve A.
When the accelerator pedal is depressed, modifier pressure (21) rises and is added to spring force to move the pressure regulator valve to the right side.
This makes drainage of line pressure (7) from chamber (C) difficult; therefore, the pressure regulator valve balances at a high level line pressure (7). In R
range, line pressure (6) is applied to the pressure regulator valve, moving the valve to the right. This makes drainage of line pressure (7) in chamber (C)
difficult; therefore, the pressure regulator valve balances at a considerably high level line pressure (7).
When line pressure or coasting clutch applied pressure are not applied to the cutback valve, modifier pressure (22) is applied to the right end of the
pressure regulator valve, moving the valve to the left side. This makes drainage of line pressure (7) in chamber (A) easy; therefore, the pressure regulator
valve balances at a low level line pressure (7).
Pressure Modifier Valve
