Low Oil Pressure Warning Indicator (Hybrid)

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The low oil pressure warning indicator informs the driver that a low internal combustion engine oil pressure condition has been detected. The engine oil pressure switch is a normally closed switch. When there is no oil pressure, the engine oil pressure switch is closed and the oil pressure input to the instrument cluster is grounded. The oil pressure is measured only when the internal combustion engine is running. The PCM monitors the engine actual speed and sends a message over the communication network to the instrument cluster. The instrument cluster uses the engine speed message from the PCM to determine whether the engine is running to illuminate or turn off the low oil pressure warning indicator. The low oil pressure warning indicator remains illuminated at the start of each ignition cycle until oil pressure is first sensed with the cycling on of the internal combustion engine.