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

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

X1-X2:

X2-X6:

X6-X8:

Normal Operation
The instrument cluster is hardwired to the oil pressure sender unit through circuit 31 (WH/RD). When there is low or no oil pressure, the oil pressure switch remains open and removes the ground to the instrument cluster and when sufficient oil pressure exists, the oil pressure switch closes providing a ground signal to the instrument cluster. The instrument cluster monitors the oil pressure and commands the low oil pressure warning indicator on or off according to engine oil pressure.

Possible Causes
- circuit 31 (WH/RD) open or short to ground
- oil pressure switch
- base engine concern
- instrument cluster