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

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

O1:

O1-O4:

O4-O7:

Normal Operation
The oil pressure switch is a normally open switch that is hardwired to the smart junction box (SJB) through circuit CMC24 (GY). When the oil pressure is within normal ranges, the oil pressure switch closes, grounding the signal to the SJB. The SJB then sends a command signal to the instrument cluster over the communication network, to turn off the low oil pressure warning indicator. When engine oil pressure is low, the oil pressure switch opens, removing the ground to the SJB. The SJB sends a low oil pressure command to the instrument cluster over the communication network to illuminate the low oil pressure warning indicator.

Possible Causes
- circuit CMC24 (GY) open or short to ground
- oil pressure switch
- base engine concern
- SJB
- instrument cluster