Econoline E550 V8-7.3L DSL Turbo VIN F (2002)
Malfunction Indicator Lamp: Description and Operation
The Malfunction Indicator Lamp (MIL) alerts the driver that the Powertrain Control Module (PCM) has detected an OBD II emission-related
component or system fault. When this occurs on a California calibrated engine, an OBD II Diagnostic Trouble Code (DTC) will be set. On a federal
calibrated engine, certain faults will also turn on the MIL.
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On all vehicles, the MIL is located on the instrument panel. On F-650/750 and E-Series, it is labeled SERVICE ENGINE SOON. On F-250/550
and Excursion, a symbol is used.
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Power is supplied to the MIL whenever the ignition switch is in the RUN or START position. If the vehicle is an F-250/550 or Excursion, the
indicator is turned on by Standard Corporate Protocol (SCP) communications connected to the instrument cluster. On F-650/750 and E-Series, the
indicator is turned on by the PCM.
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The light may also be on due to a short to ground in the MIL circuit.
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An engine, with federal calibration, operating in the Failure Mode Effects Management (FMEM) will cause the MIL to be on.
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To turn off the MIL after a repair, a clear code command from the Scan Tool must be sent.
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For any MIL concern, go to Symptom Charts. See: Testing and Inspection/Symptom Related Diagnostic Procedures
