bad checksum, car won`t start. need help

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ventovr6qc

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	bad checksum, car won`t start. need help « on: April 19, 2011, 07:33:49 PM »

i just resoldered a new chip after a bad checksum flash and the car still won`t start.
it can`t even connect with vag-com or nefmoto on the kwp2000 protocol
is it because i haven`t removed the checksum error? if so, how do i remove it

thanks


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judeisnotobscure

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	Re: bad checksum, car won`t start. need help « Reply #1 on: April 19, 2011, 07:50:52 PM »

read this thread
hope it helps
http://www.nefariousmotorsports.com/forum/index.php/topic,415.0title,.html


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I have a b5 s4
but i just want to dance.

ventovr6qc

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	Re: bad checksum, car won`t start. need help « Reply #2 on: April 19, 2011, 07:54:41 PM »

read it already
still a no go


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setzi62

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	Re: bad checksum, car won`t start. need help « Reply #3 on: April 20, 2011, 02:11:58 AM »

Did you program the new flash chip with the original image? If VAG-COM or NefMoto can't
connect after soldering in the new flash chip with orig image, you might have a soldering
problem. Check that all connections are fine and that there are no short circuits.
Connection via K-line should work independent wether there is a checksum error or not.

The checksum error is stored in the EEPROM and is not cleared when replacing the flash chip.
You can reprogram the EEPROM or do a complete flash cycle with NefMoto to get rid of this.


« Last Edit: April 20, 2011, 12:09:49 PM by Tony@NefMoto »	Logged

julex

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	Re: bad checksum, car won`t start. need help « Reply #4 on: April 20, 2011, 08:27:38 AM »

Quote from: ventovr6qc on April 19, 2011, 07:33:49 PM

Get galletto 1260 and try boot mode if your chip supports it that is. I think you went a bit overboard with the whole soldering activities. Normally, even if you screw the ECU while flashing, you can re-flash once you dicsonnect the ECU from battery for at least 1 minute.


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