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/PT 78-0003.pdf
JDB0351 PT 78 0003 Application Problem Cause Solution Note 78 1044F for 2005 2006 Ford Escape and Mercury Mariner 2WD 3 0L Mis fire poor engine performance Setting fault codes for coil on plug COP or Powertrain Control Module PCM No change in performance after replacing components or repeated failure of replacement components Incorrect spark plugs may cause damage to the COP s and PCM Ford TSB 09 2 6 refers to COP and PCM damage due to the installation of incorrect spark plugs The wrong plugs generate excessive RF interference resulting in damage to the PCM and COP s Unless these spark plugs are upgraded the failure of perfectly good replacement components will continue The TSB involves checking for the presence of a date code example shown in figure 1 If no date code of any kind is present the plugs must be replaced Also depending on how many COP codes are set it may be necessary to replace one or more COP s and the ECM Please refer to the TSB and the vehicle service manual for complete detailed instructions This ProTech bulletin is supplied as technical information only and is not an authorization for repair 2005 06 Ford Escape Mercury Mariner ECM Problem Figure 1
