Oil Pump: Inspection

WARNING: This page is about a different car, the 2021 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Check the following items.

Check the oil pump for damage and wear.
Rotate the oil pump by hand, and check that it rotates smoothly.

Measure the secondary pressure. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>SECONDARY PRESSURE (LINE PRESSURE) TEST>INSPECTION .
Remove the oil pan and oil strainer. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>OIL PAN AND STRAINER>REMOVAL .
Check oil strainer for clogging.
When oil strainer has no clogging, replace the oil pump.