Impreza 2.5 RS Sedan AWD F4-2.5L SOHC (2002)
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The TCM controls the current to the duty solenoid by gradually changing the duty ratio. As a result, the lock-up control valve also moves
gradually, so the clutch engagement pressure increases smoothly. This causes the lock-up clutch to become initially in a half-engaged state and
then in a fully engaged state, thus preventing shock during engagement.
This operation is performed for all the speed gears and always when the 4th gear is selected in the D range.
E: LINE-PRESSURE CONTROL
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The oil pump delivery pressure (line pressure) is regulated to a constant pressure by the pilot valve. This pressure is used as the pilot pressure for
controlling spool valves.
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The pilot pressure applied to the pressure modifier valve is modulated by the line pressure duty solenoid into the pressure modifier pressure.
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The pressure modifier valve is an auxiliary valve for the pressure regulator valve, and it creates a signal pressure (pressure modifier pressure). The
pressure modifier pressure is used to regulate the line pressure to a level optimum for a particular driving condition.
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This pressure modifier pressure is applied to the pressure regulator valve, which controls the oil pump delivery pressure.
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The pressure modifier pressure from the pressure modifier valve is cushioned by the pressure modifier accumulator to remove pulsation of the
pressure.
F: LINE-PRESSURE CONTROL DURING SHIFTING
