System Description

ECM performs the variable hydraulic control (low oil pressure control and high oil pressure control) based on signals from each sensor according to oil temperature and engine load. ECM activates the engine oil pressure control solenoid valve and switches to the low oil pressure control and high oil pressure control. ECM uses the low oil pressure control for 80-90% of the operating area to maintain low oil pressure and stops piston cooling jet (i.e. achievement of less than or equal to jet injection valve opening pressure).

High oil pressure control start condition 

• High oil pressure control start condition
• High engine speed
• Coolant temperature is 60 deg.C (140 deg.F) or more under high engine load condition

Low oil pressure control start condition 

• Coolant temperature is less than 60 deg.C (140 deg.F) under low engine speed condition
• Coolant temperature is 60 deg.C (140 deg.F) or more under low engine load and low engine speed conditions