Oil Pressure Switch Test

WARNING: This page is about a different car, the 2003 Acura 3.2CL, 2002 Acura 3.2CL, and 2001 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.

Remove the Yellow/Red wire (A) from the engine oil pressure switch (B). See Fig 1.
Check for continuity between the positive terminal (C) and the engine (ground). There should be continuity with the engine stopped. There should be no continuity with the engine running.

Fig 1: Removing Wire From Engine Oil Pressure Switch

Courtesy of AMERICAN HONDA MOTOR CO., INC.