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2005 Mazda 6 2.3l battery light/ alternator

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Old Aug 31, 2020 | 04:24 PM
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BoHunter0210's Avatar
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Default 2005 Mazda 6 2.3l battery light/ alternator

First time poster long time lurker. I have a 2005 Mazda 6 I sport with a 2.3l 4 cyl. Right around 140,000 miles. Recently had battery light come on and had the alternator replaced. Car ran good for a week and now the battery light is back on and it’s shifting into limp mode again. Took it back to shop and they couldn’t duplicate the light and checked the wiring etc Incase something was loose. Picked it up and within 5 minutes I duplicated the battery light. Seemed to do it in 3rd gear when I clear 3000 rpm and in 4th gear when I clear 3400 rpm. When hooked up to voltage tester everything checks out fine.

Not sure what the next step is. I didn’t really want to go to a dealership for a 15 year old car and put a ton more money into this car. It’s been a good car for the 12 years I’ve owned it until this issue.

Any help or guidance is greatly appreciated.
 
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Old Sep 1, 2020 | 06:03 AM
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FYI the alternator is controlled by the PCM/ECU. I've had to replace a few PCM/ECU's over the years in Mazdas due to charging issues.
 
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Old Sep 1, 2020 | 06:56 AM
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Originally Posted by grim_reaper
FYI the alternator is controlled by the PCM/ECU. I've had to replace a few PCM/ECU's over the years in Mazdas due to charging issues.
how hard is that to do? I’m relatively good at simple mechanical repairs. Or is it wise to let a mechanic/ tech do it?
 
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Old Sep 2, 2020 | 07:35 AM
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Replacement of the PCM requires programming to the vehicle.
I would book it in with the dealership or a specialised auto sparkie for diagnosis.
 
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