2003 Ford Mustang Mach 1, AutomaticFACTORY OEM SERVICE PROCEDURE

Control Units

CONTROL UNITS LOCATION

Component Location
ABS Control Module (3.8L) On right front of engine compartment, behind radiator. See Figure.
ABS Control Module (4.6L) On right front of engine compartment, behind radiator. See Figure.
Constant Control Relay Module (CCRM) (3.8L) Inside right front fender, behind air filter housing. See Figure.
Constant Control Relay Module (CCRM) (4.6L) Inside right front fender, behind air filter housing. See Figure.
Daytime Running Lamps Module (3.8L) In left front corner of engine compartment, below horns.
Daytime Running Lamps Module (4.6L) In left front corner of engine compartment, below horns.
Electronic Flasher Module Behind dash, on rear of central junction box.
Fuel Pump Driver Module Underside of luggage compartment. See Figure.
Generic Electronic Module (GEM) Below left side of dash. See Figure.
Intake Manifold Runner Control (3.8L) At right rear of engine compartment.
Passenger Air Bag Module At right side of dash.
Passive Anti-Theft Transceiver Module On underside of steering column.
Powertrain Control Module Behind right kick panel.
Restraints Control Module Behind lower center of dash. See Figure.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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