F 350 2WD Super Duty V10-6.8L (2009)
Malfunction Indicator Lamp: Description and Operation
Malfunction Indicator Lamp (MIL)
The MIL notifies the driver that the powertrain control module (PCM) has detected an on board diagnostic (OBD) emission-related component or system
concern. When this occurs, an OBD diagnostic trouble code (DTC) sets.
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The MIL is located in the instrument cluster and is labeled CHECK ENGINE, SERVICE ENGINE SOON or the international standards
organization (ISO) standard engine symbol.
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The MIL is illuminated during the instrument cluster prove out for approximately four seconds.
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The MIL remains illuminated after instrument cluster prove out if:
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an emission-related concern and DTC exists.
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the PCM does not send a control message to the instrument cluster (applications with the MIL controlled through the communication link).
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the PCM is operating in the hardware limited operation strategy (HLOS).
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The MIL remains off during the instrument cluster prove out if an indicator or instrument cluster concern is present.
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To turn off the MIL after a repair, a reset command from the scan tool must be sent, or three consecutive drive cycles must be completed without a
concern.
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For all MIL concerns, go to Symptom Charts See: Testing and Inspection/Symptom Related Diagnostic Procedures/No Diagnostic Trouble Codes
(DTCs) Present Symptom Chart Index.
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If the MIL flashes at a steady rate, a severe misfire condition may exist.
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If the MIL flashes erratically, the PCM can reset while cranking if the battery voltage is low.
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The MIL flashes after a period of time with the ignition in the RUN position (engine not running) if DTC P1000 is set.
CHECK ENGINE, SERVICE ENGINE SOON, or ISO Standard Engine Symbol
