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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Testing and Inspection
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Pinpoint Tests
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J - Fuel Pump Circuit
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J25 - Check Left/Front Heated Oxygen Sensor or Short to Power
J25 - Check Left/Front Heated Oxygen Sensor or Short to Power
Pinpoint Test J25: