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Posted

2010 Ford Edge, came in for fans inop. Replace cooling fans assembly and they worked fine. Customer returned a few days later with complaint of fans now not shutting off. According to the wiring diagram the only pieces in the fan system are the coolant temp sensor, PCM and cooling fan module on the fan assembly. I replaced the fan assembly again hoping that would fix it but they still stay on. Replaced the ECT sensor, still staying on. Anyone ever come across a bad PCM keeping the fans on?

Posted

The aftermarket fan assemblies are known to cause this issue. Replace with a Ford cooling fan assembly (assuming you haven't done this already) should fix it.

Posted

Can't say I have worked on the Edge, but to answer your question "can a PCM cause issues with the fan". Absolutely. Especially if the system uses a floating ground. The floating ground is provided by the PCM when "certain conditions are met". An internal short of said ground can very much happen. Causing the controlled component to malfunction. I have personally seen this with fuel injectors, cooling fans, and ground side switched fuel pumps.

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