1978 Ford FiestaFACTORY OEM SERVICE PROCEDURE

Electronic Control Module

Module contains seven color coded wires. SeeΒ Figure. Module receives power from ignition switch through Red wire while engine is running and through White wire while engine is cranking. Orange and Purple wires transmit signals from distributor while Green wire receives primary ignition current from coil which is then transmitted to ground at distributor through Black wire. System protection is provided through Blue wire, which is a fusible link. The electronic module cannot be repaired.

Fig 1: Electronic Control Module
G09351006Courtesy of FORD MOTOR CO.
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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