Ford Focus Forum, Ford Focus ST Forum - View Single Post - Alternator problem, please help
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Old 02-09-2013, 04:19 PM   #13
mikeeshaq
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I think the alternator control works on PWM pulse width modulation. When there is a demand for current then the pulses are wide. When the demand is low, then the pulses are narrow
Having said that, to replaced the ECM, you also need to program the PATS, so you need to go to Ford. Unless of course you find a ECM in a junker with a key
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