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

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

Normal Operation
The oil pressure switch 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 message to the instrument cluster (IC) 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 message to the instrument cluster (IC) over the communication network to illuminate the low oil pressure warning indicator.

- DTC C1284 (Oil Pressure Switch Failure) - is an on-demand DTC that sets in the SJB if the SJB detects a short to ground on the oil pressure input, circuit CMC24 (GY).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Oil pressure switch
- Base engine concern
- SJB
- Instrument cluster (IC)

S1-S3:

S3-S6:

S6-S8: