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Home >> Cadillac >> 1998 >> Seville STS V8-4.6L VIN 9 >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Engine Control Module >> Description and Operation >> PCM Controlled Warning Lamps >> Engine Oil Low Message
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Engine Oil Low Message


DESCRIPTION
The oil level switch is a magnetic reed float style switch which is closed with oil level full and open when oil level is low.

OPERATION
The PCM monitors the oil level switch to determine if the oil is LOW or OK. When the test conditions have been met the PCM will monitor the oil level switch input. If a low oil level is indicated the PCM will send a serial data message to the Instrument Panel Cluster (IPC). The IPC will then indicate the oil level is low. If the test conditions have not been met then the PCM ignores the oil level switch input and oil level OK is indicated to the IPC. The test conditions include a timer and a coolant temperature value. The test conditions are needed to ensure the engine has been OFF long enough for oil to drain back into the oil pan.
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