Power Steering Pressure (PSP) Switch Test
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
This tests the ability of the PCM to identify a state of change in the power steering fluid pressure. The steering wheel must briefly be turned at least 1/4 turn. This test is done during the KOER self-test.