Test D: Incorrect Oil Pressure Gauge Indication

PINPOINT TEST D: INCORRECT OIL PRESSURE GAUGE INDICATION

D1-D3:

D4-D7:

D8:

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.

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