Malfunction Indicator Lamp (MIL) Telltale Indicator

The MIL (SERVICE ENGINE SOON) telltale indicator lamp is pulled to ground by the PCM. When the lamp is pulled to ground, current from the ignition circuit flows through the indicator lamp, allowing it to come On. This indicates to the operator of the vehicle that there is a possible problem with the engine/transaxle control system.

The MIL will only be turned on for emission related faults.

During engine start-up the MIL (SERVICE ENGINE SOON) telltale indicator lamp is turned On, for approximately 2 seconds, by the PCM for a bulb check.