Code P1619, Engine Oil Life Monitor Reset Circuit

To determine the engine oil life remaining, PCM monitors engine coolant temperature, the number of crankshaft revolutions, vehicle speed, engine speed, and calculated oil temperature. When PCM determines that engine oil is near the end of its useful life, it will command instrument cluster via serial data circuit to illuminate the CHANGE OIL SOON indicator or CHANGE OIL SOON/NOW message after start-up. PCM will command the CHANGE OIL SOON indicator or CHANGE OIL SOON/NOW message on after each start-up until the engine oil life monitor is reset by grounding oil life monitor reset input circuit through the oil life monitor reset switch for more than 5 seconds. Code P1619 will set when the following condition is present.

• Oil life monitor reset input circuit is grounded for more than 60 seconds.

P1619 does not illuminate the Malfunction Indicator Light (MIL).

1. Checks circuit for a short to ground.
2. Checks for a faulty PCM or an intermittent condition.

Fig 1: Code P1619 Schematic (3.8L) Engine Oil Life Monitor Reset Circuit

Fig 2: Code P1619 Flow Chart (3.8L) Engine Oil Life Monitor Reset Circuit