Lancer L4-2.0L SOHC (2004)
Malfunction Indicator Lamp: Description and Operation
MALFUNCTION INDICATOR LAMP (SERVICE ENGINE SOON OR CHECK ENGINE LAMP)
Among the on-board diagnostic items, a Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) illuminates to notify the
driver of an emission control malfunction. However, when an irregular signal returns to normal and the engine control module (ECM) <M/T> or
powertrain control module (PCM) <A/T> judges that it has returned to normal, the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) is switched off.
Moreover, when the ignition switch is turned off, the lamp is switched off.
Immediately after the ignition switch is turned on, the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) is lit for 20
seconds to indicate that the Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) operates normally.