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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 277 (Instrument Cluster System) >> Diagnosis And Testing >> Instrument Cluster >> Pinpoint Tests >> Pinpoint Test S: The Low Oil Pressure Warning Indicator Is Never/Always On >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

The oil pressure switch is a normally open switch that is hardwired to the instrument cluster through circuit 31 (WH/RD). When the oil pressure is within normal ranges, the oil pressure switch closes and grounds the signal to the instrument cluster, and the instrument cluster turns off the low oil pressure warning indicator. When engine oil pressure is low, the oil pressure switch opens, removing the ground signal to the instrument cluster, and the instrument cluster illuminates the low oil pressure warning indicator.

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