So, I am getting the communication error which usually is from low voltage.
I've installed a mini battery Braille B2317 and now I can't even ecuFlash to communicate after I run the car... (which is what I usually had to do to get it to work)

The only way I can get it to read/write to the ecu is to leave the car running.
Has anyone else ever have this problem?
Am I looking at any negitive effects to making ecuflash shut off the engine as it does its communication read/write?

Thanks guys.... I thought this is strange.

 

i've had this issue with my mini battery. i don't leave the car running but i just take the car for a quick spin and then flash the ecu right after

 

Yeah.... tried that of course first... let it idle no dice... than I drove it down the street and back 3-4miles and again, no dice.
Leave it running, it works.... voltage seems very sensitive.....

 

Had problems like this after about 2 years with my Braille battery. Switched to a Genesis and didn't have any communication problems afterwards. Starting the car is the short time fix that seems to work.

 

Been on the same Dekka 11.5 for 2+ years, I must let the battery charge for a couple of mins before attempting to flash. No big deal.

Make sure ground is good, battery is actually pumping out the proper voltage, etc.

 

OK, I guess my real question is for the time being, is there any negitive side effects to leaving the car running AS you start to read/write to the ecu?

 

I don't think you can Because it would be flashing memory while trying to read it at the same time ?

 

if you're doing that, might as well just turned the car off right before you read/write - should still have enoguh voltage at that point

 

Hooking up something as simple as a Battery Pack ( Available from a car parts store ) or battery tender helps with that issues.

I myself will be getting rid of the mini battery and install a full sized one in the trunk.

 

oh come on don't you think I tried that? It seriously didn't work
That's why I think its so strange

At this time, that's not going to happen, I just finished building my Evo making custom battery tray and brand new battery etc...... I'll probably check the voltage to see what's going on, I do have a battery charger... just seems strange that this would happen.

 

that is strange - worked for me

 

As said above, I hook mine up with a battery charger when I flash just as an added safety net. one day battery relocation for me!

 

i flash mine when the car is still running, been doing it for a while and no issues thus far.

cheers

 

Thanks for the responce, that should help... there is just something uneasy about it shutting the engine down by itself.

 

yeah I got caught once where I flashed the car before starting it on a cold day. Killed the flash halfway through and softbricked the ECU.

Now I always make sure the car is running and kill it by flashing.