Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Oil Pressure Regulation
The main component of the oil pressure control is a vane pump driven by the crankshaft with a chain. The pump has an adjustable outer ring. Displacement of the pump changes depending on the position of the outer ring. In its original position the pump gives its maximum flow and thus maximum oil pressure, while when fully regulated gives a smaller flow/pressure.
Depending on the engine temperature, engine speed (RPM) and torque output the oil pump is controlled to a current optimal pressure. Thereby, the power consumption from the oil pump can decrease, which eventually contributes to a reduction of fuel consumption and exhaust emissions.
The regulation of displacement is performed by a control valve that is located on the oil pump housing. By controlling the flow of oil the adjustment ring can be rotated, changing the eccentricity and thus the vane pump's supply volume.
Unpowered control valve means that the adjustment ring is return sprung to the position where the pump produces maximum oil pressure.
The Engine Control Module uses the information from the engine oil pressure and engine temperature sensor to calculate the control signal to the control valve to achieve the desired oil pressure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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