0411 Reading and Flashing VATS Relearn?

[DropdaHammer]

Hello all, I'm new to the Forum.

I bought a OBDX Pro and am using PCM Hammer 021.
On my 2002 Yukon 5.3L with I think a Hardware Type: P01_P59 PCM I read the ECU and then the Truck would not start. I was thinking it needed the VATS 30 min relearn so I started doing that. after the first 10 min cycle I got impatient and got out my code scanner to see if it would tell me for sure it needed the relearn. after the scan tool scanned all the modules for codes, no codes found. the truck started right up without issue. I then used Universal patcher to change a few things then flashed that back to the truck and had the same experiance again.

I was just wondering am I doing something wrong? Or is this normal to have to do a relearn and or scan all modules to get it to start again?

Thanks for the help. Sorry for the newbie questions.

[ironduke]

Possibly not exiting the kernel and turning the ign off for 30 seconds or so?

[zack4200]

I'm assuming you're doing these reads/writes on in vehicle? I've come across this a few times in vehicle, if ironduke's suggestion doesn't work, I've also fixed it a couple times by disconnecting the battery for ~30 seconds.

[DropdaHammer]

Possibly not exiting the kernel and turning the ign off for 30 seconds or so?

On the first Read I did not exit the kernel. On the 2nd write I did exit the kernel at the end.

The 30 second wait could be where I went wrong. I'll give it another try. Thanks!

[DropdaHammer]

I'm assuming you're doing these reads/writes on in vehicle? I've come across this a few times in vehicle, if ironduke's suggestion doesn't work, I've also fixed it a couple times by disconnecting the battery for ~30 seconds.

Yup on the vehicle. I just wrote the PCM again today before reading the responses here. I did exit the kernel. Not sure if I waited the full 30 seconds or not. Just waited a bit then plugged in the Scan tool did a full module code scan and then it started right up again.

I'll make sure to wait 30 plus seconds next time and try it.

Just curious what is the ECU doing durring this 30 second wait time?

Thanks again.

[antus]

Its not really 30 seconds, its just long enough for everything to shutdown. The PCM does do some things on shutdown but its seconds. 30 seconds is to be safe. It might only need 5 or 10. Essentially to reboot the car. I'd normally count out 1 and 2 and 3 and 4 and in my head then key back on. But you might need more.