EEV - IV Electronic Control Unit Identification Codes Ford 5.0L Mustang ECUs On the top , just above the bar code , 1990–1992 CA / Fed manual A9L and onThis is a 1983-1984 Ford EEC-IV Self Test Procedures. It is used. It is complete. Inside pages are really clean. Control/Emissions Diagnosis" manual for automotive applications. The primary focus of this service manual is on diagnosis of the FORD EEC-IV Electronic Fuel.