Test D: Incorrect Oil Pressure Gauge Indication

PINPOINT TEST D: INCORRECT OIL PRESSURE GAUGE INDICATION

D1-D2:

D3-D5:

Normal Operation
The engine oil pressure switch is a normally open switch. When the oil pressure is within normal ranges, the engine oil pressure switch closes sending a ground signal to the instrument cluster through circuit 31 (WH/RD). The instrument cluster, upon receipt of the ground signal, commands the oil pressure gauge to the normal or mid-range position. When the oil pressure is low the engine 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
- circuit 1308 (BN/OG) open or short to ground (diesel only)
- engine oil pressure switch
- base engine concern
- instrument cluster