Test D: Incorrect Oil Pressure Gauge Indication

PINPOINT TEST D: INCORRECT OIL PRESSURE GAUGE INDICATION

D1-D4:

D4-D7:

Normal Operation
The oil pressure switch is a normally open switch. When the oil pressure is within normal ranges, the oil pressure switch closes and sends a ground signal to the instrument cluster through circuit 31 (WH/RD) setting the oil pressure gauge to the normal or mid-range position. When the oil pressure is low, the oil pressure switch opens, removing the ground signal, and the instrument cluster commands the oil pressure gauge to the L (low) position.

DTC C1284 - is a continuous and on-demand DTC that sets if the instrument cluster detects high resistance on the oil pressure input, circuit 31 (WH/RD) with engine speed above 500 rpm for 5 seconds or if the instrument cluster detects a short to ground with the engine off.

Possible Causes
- Circuit 31 (WH/RD) open or short to ground
- Engine oil pressure
- Engine oil pressure switch
- Instrument cluster