Hi all. I just got my ATI installed. I made changes in ls1 edit for my fuel injectors and offset tables and flashed them in my car. Fired it up and let it idle relearn. Ready for the first test ride and to log some #'s. Here's the weird thing. I can slowly bring the revs up to 6k and no problem. However, if I punch the gas and shoot the revs up quickly, The DIC comes on and says reduced engine power, service active handling, service traction control. wth? I pulled the codes and they were P1514, C1278 and B2860. That last code I can't find in my manual for all the codes. Maybe I copied it down wrong or something. I'll double check it later. Anyway, does anyone have any idea why the car is doing this? I went back into edit and checked my #'s against another members with the same year car and ATI as me and they were the same for all the values I changed. Oh, I almost forgot. Everytime I read or flash the pcm, as soon as it gets done and the box pops up saying turn off key and shut program, my car starts "dinging" at me and the DIC says reduced engine power. Is it normal for the DIC to give you that message at the end of a read or write of the PCM? I made sure the battery was fully charged, had everything turned off, etc. etc. I am stumped. My dream is becoming a nightmare. Someone help!!

 

The reduced engine power thing after programming is a result of modules having lost communication with one another and isn't related to your other issue. It's not unusual and there are ways to prevent it if it's really bothersome. Most just clear the codes and don't sweat it.

There's a new table related to the P1514 code. I haven't looked at it closely but it was added primarily for FI guys. ;) It's not a nightmare yet.

Here's an old thread that may give you some insight into what's going on:

http://forums.corvetteforum.com/zerothread?id=207178


I remember others (neverenuf, Jim Hall, etc...) having to mess with this, say maybe May/June.



[Modified by ToplessTexan, 7:41 PM 8/17/2002]

 

I have checked all my hoses and cannot find any leaks. The car is basically undrivable at this point. Any time you give it very much gas, I get the reduced power mode and service active handling and trac control. The 2 codes it throws are P1514 and C1278. Could anyone give me any idea as to how to fix this? In another thread, it said something about 1514 occuring when the air flow doesn't match what the cpu predicts the airflow to be. So, would that be a tuning issue in LS1 edit? Any insight is greatly appreciated. This is so frustrating.

 

http://forums.corvetteforum.com/zerothread?id=363327

Look at upgrade #9... :)

 

Leerph, Bill is correct. This table is used to define expected airflow, at least relative to the P1514 test.

 

Does anyone have a copy of this table. Or, does anyone know what direction I might go i as far as scaling the values in order to not trip this code. I'm kinda at a standstill with this at this point. I'll call carputing Monday to see if I am eligible for the new software. In the meantime, if anyone can chime in that would be great. Thanx.

 

The table has Throttle Position on the X axis (0-96) and RPM on the Y (0-8000). I'm pretty sure the data values are the max airflow in Gm/sec that will be allowed before the code is thrown.

A few examples are
30%TPS 4000RPM = 345
48%TPS 4000RPM = 610

I'm assuming you will just scale this table up by whatever % seems reasonable. No reasons to be real accurate since you are just trying to avoid the code.

Keep us posted on how it goes. I have not installed my ATI yet, but also plan on doing some initial self tuning in the next few weeks. I’m actually planning on taking the car to Ed Wright and get it dyno tuned by a pro, but I will play around with it and see where I can get on my own. I may even keep an extra unlocked PCM around so I can continue to learn and tweak on my own.

I think that tuning these cars for FI setups is not as easy as it sounds. There are probably a few little tricks (like the new table) that us common follk just don't have access to. It's too bad that Ed does not have some type of open source thing going on. Then again, I totally respect the fact that he needs to protect his intellectual property.

With that said, I still think you can get a decent tune on your own with a wideband. You probably won’t get every drop of horsepower out of it, but you will still get it running good enough to put a big simile on your face.

 

An ignoramus here but had similar problems following mymods and it was due to shorter underdrive pulley, not enough crank to the alternator therefore throwing some codes...