Service Engine Soon/Malfunction Indicator Lamp

Among the on-board diagnostic items, a Service Engine Soon/Malfunction Indicator 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) or powertrain control module (PCM) judges that it has returned to normal, the Service Engine Soon/Malfunction Indicator Lamp is switched off.

Moreover, when the ignition switch is turned off, the lamp is switched off. Even if the ignition switch is turned on again, the lamp does not illuminate until the malfunction is detected. Immediately after the ignition switch is turned on, the Service Engine Soon/Malfunction Indicator Lamp is lit for five seconds to indicate that the Service Engine Soon/Malfunction Indicator Lamp operates normally.

P0101 - P0303:

P0304 - P1751:

Items Indicated by the Service Engine Soon/Malfunction Indicator Lamp

NOTE: If the Service Engine Soon/Malfunction Indicator Lamp illuminates because of a malfunction of the engine control module (ECM) or powertrain control module (PCM) , transmission between scan tool MUT-II (MB991502) and the ECM or PCM is impossible. In this case, the diagnostic trouble code (DTC) cannot be read.

NOTE: After the ECM or PCM has detected a malfunction, the Service Engine Soon/Malfunction Indicator Lamp illuminates when the engine is next turned on and the same malfunction is re- detected. However, for items marked with a "*" in the DTC NO column, the Service Engine Soon/Malfunction Indicator Lamp illuminates on the first detection of the malfunction.

NOTE: After the Service Engine Soon/Malfunction Indicator Lamp illuminates, it will be switched off under the following conditions.
- When the ECM or PCM monitored the power train malfunction three times* it met set condition requirements, it detected no malfunction. *: In this case, "one time" indicates from engine start to stop.
- For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant temperature, etc.) are similar to those when the malfunction was first recorded.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the sensor mounted at the position second closest to the engine.