The oil pressure switch in your vehicle measures the integrity of the engine's lubrication system -- it warns you when it detects a problem. If the oil pressure switch is not functioning properly, however, you may remain unaware of additional mechanical problems. It's imperative to ensure a proper connection between the oil pressure switch and the engine control unit. An improper connection will result in a malfunctioning oil pressure switch. Verify that a problem, which may seem related to the oil pressure switch, isn't actually caused by low oil levels or a clogged filter.
Ensure a secure connection between the red wire to the oil pressure switch and connector "B5" on engine control unit "B."
Check the oil level in your vehicle. If the oil level is low, replace missing oil.
Check for a clogged filter, which may cause a drop in oil pressure. Remove the O-ring gasket and its attached filter from the VTEC solenoid valve assembly. Rinse the filter to remove dirt and debris, and then return it to its place on the solenoid valve assembly.
Connect the black harness lead on the pressure switch to the chassis ground. Check for continuity. If you do not observe continuity, replace the oil pressure switch.
