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Oil Pressure Switch Test

  1. Remove the Yellow/Red wire (A) from the engine oil pressure switch (B). See Fig 1.
  2. 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
G00299065Courtesy of AMERICAN HONDA MOTOR CO., INC.