F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
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, an OBD II Diagnostic Trouble Code (DTC) will be set.
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The MIL is located on the instrument panel and is labeled SERVICE ENGINE SOON.
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Power is supplied to the MIL whenever the ignition switch is in the RUN or START position.
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The MIL will remain on in the RUN/START mode as a bulb check or until the CKP signal is detected.
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The light may also be on due to a short to ground of 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.
