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alternator problem or ecu problem?
Hi I do need some help here, my car is 2004 mazda 6 luxuy sport GG1 .. 122000km
My carís battery light has on for few weeks, I have been to few places and they told me that they been tested my battery and alternator and they all work just fineÖ.and other guy told me my car is may be ecu problem, he tried to reprogram it but cannt so he said I should change a ecu because ecu said alternator no charging but itís actually charging so it could be ecu problem.
I have been drive my car with battery lights on for a month everything is fines nothing wrong at all but battery light never goes off. ( it actually goes off for a week and come back again)
So I went to Mazda service station yesterday to do full inspection and they keep my car over night charge me a lot of money and finally said the problem is alternator which will cost me 1000 dollar to do it ( btw I come from Australia, I cannt believe why alternator is so expensive here) ..
I have got report from them said:
Checked and confirmed battery light on. Checked and found code logged in system. Cleared code. Tested, code came back. Check drivebelt for tension/wear, all ok. Inspected wiring connections at alternator and at PCM, all ok. Tested wiring loom for shorts, none found. Tested for open circuit. None present. Tested alternator readings at PCM and alternator below specification. Need to replace alternator.
So my question is that my carís problem really is the alternator break down? Or something wrong with connection? I know I shouldnít doubt Mazda service station because they made this car but I just wanna know ..