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 MANUALSFORD2004MUSTANG BASE, 2D COUPE, 3.9 6, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 772 (ELECTRONIC ENGINE CONTROL SYSTEM -- DIESEL ENGINE -- F250-F550 SUPER DUTY)REMOVAL AND INSTALLATIONPOWERTRAIN CONTROL MODULE (PCM)REMOVAL AND INSTALLATION

2004 Ford Mustang Base, 2D Coupe, 3.9 6, Automatic

Removal and Installation

2004 Ford Mustang Base, 2D Coupe, 3.9 6, AutomaticSECTION Removal and Installation

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Always disconnect the battery ground cable prior to working on the electronic engine controls.

Disconnect the battery ground cable. For additional information, on vehicles equipped with dual batteries, refer to BATTERY, MOUNTING AND CABLES .
Disconnect the auxiliary battery positive cable (LH side of the engine compartment).

Fig 1: Disconnecting Auxiliary Battery Positive Cable (LH Side Of Engine Compartment)
Courtesy of FORD MOTOR CO.
Remove the auxiliary battery cover.

Fig 2: Removing Auxiliary Battery Cover
Courtesy of FORD MOTOR CO.
Unlatch and disconnect the powertrain control module (PCM) electrical connectors.

Fig 3: Disconnecting Powertrain Control Module Electrical Connectors
Courtesy of FORD MOTOR CO.
Remove the bolts and PCM.

Fig 4: Removing/Installing PCM Bolts With Torque Specifications
Courtesy of FORD MOTOR CO.
To install, reverse the removal procedure.

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.