The Motorcraft 3C3Z-9D930-AA Fuel Injection Control Module (FICM) Wiring Harness is a genuine Ford OEM replacement sub-harness engineered specifically for early-production 2003 to late-2003 Ford Super Duty trucks and Excursions equipped with the 6.0L Powerstroke diesel engine. Connecting the high-voltage FICM directly to all eight fuel injectors and critical engine sensors, this factory loom features OE heat-resistant split conduit, factory-molded locking connector plugs, and original gauge wiring to deliver clean, uncorrupted 48-volt open/close signals to the injector spool valves.

Quick Specs & Kit Inclusions

• Application: Engine-mounted fuel injector control module to injector sub-harness
• Production Build Window: Specifically fits vehicles built from 01/30/2003 through 12/01/2003
• Voltage Rating: Engineered to carry pulsed 48V DC high-current signals and ground returns without thermal breakdown
• Integrated Terminations: Includes 8 injector connector plugs, primary FICM interface plugs, EBP/sensor leads, and factory chassis ground eyelets
• Manufacturing Standard: Genuine Ford Motorcraft Original Equipment Manufacturer (OEM) component
• Emissions Status: 50-state legal (direct OE replacement wiring assembly)
• Direct Interchange Part Numbers: Ford 3C3Z-9D930-AA, Motorcraft 3C3Z9D930AA
• What's in the Box: (1) Genuine Ford Motorcraft 3C3Z-9D930-AA Complete Injector Wiring Harness

Problem Solved: Curing Spurious DTCs, Cylinder Misfires & Connector Brittleness

Routing over the hot valve covers and underneath intake ducting exposes the factory 6.0L FICM harness to continuous vibration and extreme heat. Over time, original wire insulation hardens and cracks, causing intermittent short circuits or high-resistance faults in the 48-volt injector circuits. More commonly, the delicate plastic locking tabs on the injector plugs and FICM connectors turn brittle, shatter, or back out. This results in phantom cylinder misfires (DTCs P0261 through P0284), erratic idle, severe stalling under acceleration, or intermittent dead-pedal conditions. Installing the genuine Motorcraft 3C3Z-9D930-AA provides fresh, positive-locking connector clips and heat-tolerant shielding, permanently resolving loose connections and intermittent circuit dropouts.

Fitment

• 2003–2004 Ford F-250 Super Duty 6.0L Powerstroke Turbo Diesel (Built 01/30/2003 to 12/01/2003)
• 2003–2004 Ford F-350 Super Duty 6.0L Powerstroke Turbo Diesel (Built 01/30/2003 to 12/01/2003)
• 2003–2004 Ford F-450 Super Duty 6.0L Powerstroke Turbo Diesel (Built 01/30/2003 to 12/01/2003)
• 2003–2004 Ford F-550 Super Duty 6.0L Powerstroke Turbo Diesel (Built 01/30/2003 to 12/01/2003)
• 2003–2004 Ford Excursion 6.0L Powerstroke Turbo Diesel (Built 01/30/2003 to 12/01/2003)
• Fitment Note: Critical production date check required. Fits engines manufactured between 01/30/2003 and 12/01/2003. Trucks built from 12/02/2003 to 04/10/2004 use 4C3Z-9D930-AA, and trucks built on or after 04/11/2004 use 5C3Z-9D930-A.

Safety & Power Cutoff: Park on level ground, turn off the ignition, and disconnect both negative battery cables. Allow the engine valley to cool completely before servicing. Clearance Disassembly: Remove the air intake tube, turbo intake boot, and intercooler (CAC) piping to expose the FICM bracket on the driver-side valve cover and the injector pass-through harness locations. Module & Sensor Disconnection: Depress the locking latches on the three (3) main FICM connectors and disconnect them from the module base. Release the sensor connectors (such as the Exhaust Backpressure Sensor and oil temperature sensors tied to this harness branch). Injector Clip Release: Carefully depress the release wire clips on each of the eight (8) fuel injector connectors along the cylinder head rocker boxes. Unthread the harness from factory retainers and remove the old assembly from the engine bay. New Harness Routing: Lay the new Motorcraft 3C3Z-9D930-AA harness in place along the rocker boxes, routing each cylinder branch to its corresponding cylinder number. Hand-press each injector connector into place until an audible, mechanical click confirms positive retention. FICM Connector Seating: Align the three FICM module plugs into their respective keyed receptacles on the underside of the FICM. Push firmly until each locking latch snaps securely shut. (Ensure no pins are bent and connectors are fully seated to avoid module damage). Ground & Loom Retention: Bolt down all factory ground eyelets securely to the engine block/chassis grounds (8–10 ft-lbs / 11–13 Nm). Fasten all plastic harness conduit clips into the factory valve cover brackets to prevent the loom from rubbing against high-temperature turbo piping. Reassembly & Startup: Reinstall CAC pipes, intake ducting, and reconnect both battery terminals. Turn the ignition key to "RUN" (KOEO) and use an OBD-II scan tool to clear historical injector circuit fault codes. Start the truck, verify smooth idle across all eight cylinders, and inspect live data to ensure steady 48V FICM output under throttle.