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.
Electronic Engine Control (EEC-IV)
The EEC-IV system monitors engine operation to provide proper engine emission and fuel economy. EEC-IV system operation is controlled by the Electronic Control Assembly (ECA).
The ECA receives information from several sensors and electronic devices. Output signals are then generated to control engine operation. Calibration module for EEC-IV systems is mounted inside ECA.
Engine operation is controlled in 3 areas by the EEC-IV system. These areas are air/fuel mixture, ignition, and emission control. This system provides self-diagnostic capabilities for engine operation.
On the Aerostar, the ECA unit is located in the left side dash panel of the passenger compartment. On Ranger and Bronco II the ECA unit is located on right side of dash behind kick panel. On F150/350 and Bronco series, the ECA unit is located behind kick panel on left side of dash. On E150/350 series ECA unit is located on right side dash panel under heater blower motor.
Use the Manual With the Right Hardware
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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.
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