Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004PICKUP F350 SUPER DUTY, 4D PICKUP, 6.8 S, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - PINPOINT TEST DX: ENGINE COOLANT TEMPERATURE (ECT) SENSOR THROUGH PINPOINT TEST HC: FUEL DELIVERY SYSTEM - CNG, FLEX-FUEL & GASOLINEPINPOINT TEST HA: NATURAL GAS FUEL CONTROLINTRODUCTIONNOTES
2004 Ford Pickup F350 Super Duty, 4D Pickup, 6.8 S, RWD, Automatic
Pinpoint Test HA: Natural Gas Fuel Control: Introduction: Notes
2004 Ford Pickup F350 Super Duty, 4D Pickup, 6.8 S, RWD, AutomaticSECTION Notes
NOTE:
This pinpoint test is intended to diagnose the following:
- HO2S/HTR (Heater) (9F472).
- HO2S Connections.
- Vacuum Systems.
- Fuel Injectors.
- Harness circuits: HO2S GND, HO2S, INJ-1-8, VPWR and SIG RTN.
- Powertrain control module (PCM) (12A650).
- Natural Gas Module (NG) (9F954).
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.