Oil Level Sensor: Description and Operation

Description:

PURPOSE
The engine oil level sensor is used to detect low engine oil level conditions.

OPERATION
The Engine Oil Level Switch is a simple float switch that is grounded when the engine oil level is OK. The PCM checks the Engine Oil Level switch circuit at start-up. If the engine has been running, the PCM performs a test routine based on engine coolant temperature to ensure that the engine oil has drained back into the sump before checking the state of the engine oil level switch. If the engine coolant temperature is greater than 10°C (59°F), the PCM compares the engine coolant temperature at the last key OFF to the engine coolant temperature at the current key on. If the difference between the recorded temperature values is at least 12 C (54°F), the PCM will test the engine oil level.

DIAGNOSIS
If an engine low oil level conditions exists the PCM will send the information via Class 2 Serial Data to the Instrument Control Panel (IPC). The IPC will illuminate the Low Oil Level Lamp.