F 350 4WD Super Duty V10-6.8L VIN V (2005)
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Malfunction Indicator Lamp: Description and Operation
Malfunction Indicator Lamp (MIL)
The MIL notifies the driver that the powertrain control module (PCM) has detected an OBD emission-related component or system fault. When this
occurs an OBD diagnostic trouble code (DTC) will be set.
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The MW is located in the instrument cluster and is labeled CHECK ENGINE SERVICE ENGINE SOON or the ISO standard engine symbol.
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The MIL is illuminated during the instrument cluster prove out for approximately 4 seconds.
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For applications with a dedicated hard wire MIL circuit the PCM will illuminate the MIL until a profile ignition pickup (PIP) signal is detected.
For 2OO5 the following vehicles use a hard wire circuit: Crown Victoria/Grand Marquis Explorer Sport Trac and Ranger.
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The MIL will remain illuminated after instrument cluster prove out if:
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an emission related concern and DTC exists.
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no PIP signal is detected (applications with a dedicated hard-wire MIL circuit). The PIP signal is generated in the PCM using the
crankshafi position (CKP) sensor. For these applications the MIL can be helpful in diagnosing a no start.
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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 (KLOS).
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the MIL circuit is shorted to ground (applications with a dedicated hard wire MIL circuit).
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The MIL remains off during the instrument cluster prove out if:
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an indicator or instrument cluster concern is present.
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the MIL circuit is open (applications with a dedicated hard wire MIL circuit).
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To turn off the MIL afier a repair a reset command from the diagnostic tool must be sent or 3 consecutive drive cycles must be completed without
a fault.
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For all MIL concerns go to Symptom Charts.
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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.