Operation CHARM
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Mercury
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1993
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Grand Marquis V8-281 4.6L SOHC
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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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Pinpoint Tests
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KN - Fuel Pressure Regulator Control Solenoid
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KN4 - Check Vacuum Signal Between FPRC Solenoid and Manifold
KN4 - Check Vacuum Signal Between FPRC Solenoid and Manifold
Pinpoint Test KN4:
