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Home >> Buick >> 1995 >> LeSabre Custom >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes) >> ECM/Pcm Code Charts >> Code P1619, Engine Oil Life Monitor Reset Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

To determine engine oil life remaining, PCM monitors engine coolant temperature, number of crankshaft revolutions, vehicle speed, engine speed, and calculated oil temperature. When PCM determines engine oil is near end of its useful life, it will command instrument cluster via serial data circuit to illuminate CHANGE OIL SOON indicator or CHANGE OIL SOON/NOW message after start-up. PCM will command CHANGE OIL SOON indicator or CHANGE OIL SOON/NOW message on after each start-up until engine oil life monitor is reset by grounding oil life monitor reset input circuit through oil life monitor reset switch for more than 5 seconds.

P1619 does not illuminate Malfunction Indicator Light (MIL).

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