Circuit Description

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

When the engine oil level is in the normal range, the engine oil level switch is a closed switch and the engine oil level switch signal is low.

When a low engine oil level condition is present, the engine oil level switch is an open switch and the engine oil level switch signal is high. The IPC receives a class 2 message from the PCM requesting illumination of the CHECK ENG OIL LEVEL indicator.

Fig 1: Low Engine Oil Level Indicator Always On Diagnosis (Steps 1-8)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Low Engine Oil Level Indicator Always On Diagnosis (Steps 9-12)

Courtesy of GENERAL MOTORS CORP.