Operation CHARM
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Ford Truck
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1998
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F 150 2WD Pickup V8-5.4L CNG VIN M
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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Diagnostic Routines
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5 - Fast Idle - Diesels/Runs On
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Test Notes
Test Notes
NOTE:
If the vehicle runs normally after the ignition key is turned off, check for damaged
ignition switch
, IGN RUN circuit short to power, VPWR circuit short to power, etc.