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I recently bought a 2009 370z Touring and I need my car stock tuned after I removed custom modifications. However, dealer told me that they could not access the ECM because the engine fans come on when in on position(engine off) and cannot disconnect the fans because my engine will overheat. I have already changed the Engine fan control module and the problems remains. What is possibly the root of the problem? I appreciate the feedback.
 

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Often fans on with key on is a sign of defective ECM............they are NOT correct doing that.

PS, they can access and reflash an ECM with it out of the car, just likely not wanting to as what you have there often turns into a millstone around their necks and they have no time for that.

You can always simply buy a separate ECM with the OEM stock software load in it.
 
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