E40 checksum error

[clm7182]

I'm new to efilive and am working with a 2005 corvette. I have previously applied the MAF OS patch successfully and recently made changes to the calibration and tried to flash the new cal file but received a checksum error $06FF. I've tried flashing the original cal file and the one read off the PCM after the MAF patch before changing anything else but I still receive the checksum error. I have not tried doing a full flash of any of the cal files afraid I'll brick the PCM if a full flash does not take. Any advice would be appreciated. Thanks.

[GMPX]

Can you please post the tune up here?

[clm7182]

Sure, I have attached the cal file pre MAF patch (0000) after MAF patch (0002) and the modified cal file (0003). Thanks.

[GMPX]

Did any of these tunes previously flash ok?

[clm7182]

(0000) was the cal as read from the car when it got it. (0002) started from (0000) and I simply applied the MAF OS patch and performed a full flash successfully. (0003) is (0002) but with modification to the high octane timing table but returns the checksum error when I try to cal flash back to the car. (0002) will also not flash back to the car.

[GMPX]

Here you go, try this one instead. Nothing you've done looks like a previous tuner was trying to disguise the tune from GM.

Cheers,
Ross

[clm7182]

Great, thanks for your help.

[clm7182]

I noticed the file won't open in v7.5 but will in v8. Do I need to flash the cal with v8 and read it back in with v7.5 to edit?

[GMPX]

You will probably need to update to this software release...
http://www.efilive.com/latest/softwa...e-apr-13-2015/

Cheers,
Ross

[clm7182]

Yep, upgraded and all works fine, the cal you sent flashed without a problem. Thanks again for your help.