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I have a 2007 ford focus 1.6i hatchback, duratec engine, this car would not startup only crank, i have tested the ecu, checked all the fuses and relays, coded the keys and tried reprogramming, the fault on the cluster reads engine system failure but when you connect the diagnostic tool onto the plug there is not signal going to the ecu and back, what could be the problem, i have brought in a n auot electrician, i have taken the car for coding, i even taken the car to ford agent and they cannot find the fault. any ideas.
 

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I had a very similar problem at one point that turned out to be a bad ground, the negative battery terminal hadn't been tightened down very well. It's not much but it's an easy place to start.
 
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