Circuit/System Description

The engine control module (ECM)/powertrain control module (PCM) determines when the engine oil should be changed and calculates the oil life in percent. The ECM/PCM sends this information via the serial data circuit to the instrument panel cluster (IPC). The IPC receives the oil life data from the ECM/PCM and displays the oil level percent in the IPC. The IPC displays the CHANGE ENGINE OIL message when the oil needs to be changed.