Test C: The Low Oil Pressure Warning Indicator Is Never/Always On

PINPOINT TEST C: THE LOW OIL PRESSURE WARNING INDICATOR IS NEVER/ALWAYS ON

C1-C4:

C4-C6:

C6-C8:

Normal Operation
The oil pressure switch is a normally open switch that is hardwired to the instrument cluster through circuit 253 (DG/WH). 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.

Possible Causes
- circuit 253 (DG/WH) open or short to ground
- oil pressure switch
- base engine concern
- instrument cluster