Hi, my ford is doing weird things and PCM or ecm is not communicating properly(when i connect to ecm after few seconds i have to reconnect). At random times relay in engine bay relay of glowplugs starts to click for few seconds and stops. This also occurs when i open or close front doors. When i tur…

So did you chase the comm wires to find the short as I suggested? Did you check for shorted or broken wires at the door as @TwinTurbo suggested? Did you get a wiring diagram for the car as @asemaster suggested? You can post this as many times as you want on this forum but you’ll get the same resp…

For your information… I posted this because i discovered new things. If you would read closely this is wrote differently than my last post. Next thing are comm wires at doors. Why would they be bad? When i disconnect the door section it does exaclty same thing. Only manipulating with doors does not …

[image] dianiskatomas_191452: Next thing are comm wires at doors. Why would they be bad? This is the third, separate post on this topic. Read the prior one- A somewhat common failure mode is when the wires going between the chassis and door fail from repeated bending/flexing. Rather than …

Your 3 posts read the same and you didn’t answer any of my questions. Instead of a US based forum for a car not sold here maybe this is a better forum for your issues. [image] Ford Mondeo IV, generation #4 The Ford Mondeo Mk IV (third generation), codenamed CD345 was officially unveile…

Is the battery fully charged & in good condition? fyi, the UK magazine Practical Classics has posted several u-tube vdos about restoring an older Ford Mondeo. None are concerned with the problem you are having afaik, but if you want to watch them for general interest, Google practical classics …

[image] dianiskatomas_191452: When i disconnect the door section it does exaclty same thing. Depends on the location of the door ajar switch. Some computers “wake up” and engage systems; pumps and actuator motors when the driver’s door is opened. The failure is likely within those systems and…

Thank you for the update… I updated the other 2 threads with a link back to this thread since they are all related to the same issue…

ECM not communicating

Maintenance/Repairs

dianiskatomas_191452 May 11, 2026, 11:24am 8

RESOLVED: Finally after many many attempts I got it to work. The whole problem was 1 diesel injector internally shorted to ground. This injector was shorting also the ECM.

Multiple modules not communicating

No communication between modules/car wont start

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ECM not communicating

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