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Home >> Oldsmobile >> 1997 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1619 - Engine Oil Life Monitor Reset Circuit >> Circuit Description
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Circuit Description

To determine engine oil life remaining, PCM monitors ECT, number of crankshaft revolutions, vehicle speed, and calculated oil temperature. When PCM determines oil is at end of useful life, it will send a signal through Serial Data Line (SDL) to illuminate CHANGE OIL SOON indicator.

Condition required to set DTC is:

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