Outback F6-3.0L (2003)
controlling spool valves.
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The pilot pressure applied to the pressure modifier valve is modulated into pressure modifier pressure at the line pressure duty solenoid by
activating the pressure modifier valve.
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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.
LINE-PRESSURE CONTROL DURING SHIFTING
The line pressure which engages shift clutches to create 1st to 4th speeds is controlled by the TCM to meet varying operating conditions.
During gear shifting, the TCM decreases the line pressure to a level that matches the selected gear in order to minimize shifting shock loads.
During gear shifting, the TCM controls the line pressure as follows:
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The TCM receives signals such as throttle position signal and accelerator pedal speed signal. Based on these input signals, it issues a control signal
to the line pressure duty solenoid.
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The pressure from the line pressure duty solenoid (line pressure duty pressure) is converted by the pressure modifier valve into a modifier
pressure, and the modifier pressure is applied to the pressure regulator valve.
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The pressure regulator valve adjusts the oil-pump-generated line pressure according to the modifier pressure to make the line pressure matched to
the driving condition.