PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

pcm can read tune but can't flash, failed bootloader

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Old Jan 6, 2010 | 10:06 PM
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Default pcm can read tune but can't flash, failed bootloader

pcm wont accept flash, pcm is good and was reflashed on a bench harness. Im having some sort of electrical issue and dont know where to start?

Last edited by pdasterly; Jan 6, 2010 at 11:44 PM.
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Old Jan 10, 2010 | 02:09 AM
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anyone?
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Old Jan 10, 2010 | 06:49 AM
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What are the error codes you are getting?
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Old Jan 10, 2010 | 10:38 AM
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If your PCM accepted a bench flash, but not an onboard, you may have a problem with your DLC connector.
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Old Jan 11, 2010 | 03:28 PM
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Can the tune be flashed on the bench harness? Or just read.

It is impossible... yes impossible for the read to work and the write to fail due to a seed/key missmatch.. The key for reading is the same for writing, so it cant be locked..

The only thing to check is you have the correct ecm type selected depending on your software you are using, OR check for 12v and grounds at your connector under the dash that you are plugging into to see if it has power and is working.
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Old Jan 20, 2010 | 11:44 AM
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fixed the problem, I just drove around some more and everything works fine now. I guess i had a gremlin in my system, the car was put together from three differant cars
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Old Jan 24, 2010 | 03:00 AM
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Originally Posted by pdasterly
fixed the problem, I just drove around some more and everything works fine now. I guess i had a gremlin in my system, the car was put together from three differant cars
Gremlins = electrical problems (power/ground connections may have corrosion/resistance)...

But I am happy you got it going......is this the 99 or the 98...?
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Old Feb 7, 2010 | 11:03 PM
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Originally Posted by joecar
Gremlins = electrical problems (power/ground connections may have corrosion/resistance)...

But I am happy you got it going......is this the 99 or the 98...?
Firebird 99
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Voltage was probably too low. I've seen that set a boot load error.
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