Did I fry my ECM? Always in limp home mode - Third Generation F-Body Message Boards

bigburb93 · 08-21-2006, 07:19 AM

OK so Friday I tried burning my first chip and it went well except when I put it in my car immediately went into limp home mode. Found out I put in the chip backwards so I turned it around and no change. I even emulated the stock tune back to the computer and no change, take the chip out entirely and no change. I can't get anything in my datalog except a bunch of troublecodes and my O2 sensor readings. Did I fry my ECM by putting the chip in backwards the first time?

Trouble Codes:
Bad PROM
Faulty ECM
System voltage too high
Fuel pump voltage too low
Low coolant Temp
High coolant Temp

This ad is not displayed to registered members.
Register your free account today and become a member on ThirdGen!

RednGold86Z · 08-21-2006, 08:26 AM

Are you using an Autoprom??

Moates.net F.A.Q

Documentation : Moates.Net

Documentation : Moates.Net

bigburb93 · 08-21-2006, 01:03 PM

ah ok, in lamens terms how would i disable my checksum?

JP86SS · 08-21-2006, 06:16 PM

Set the "mask ID" ($6E, $8D or whatever) to "AA"

bigburb93 · 08-21-2006, 09:24 PM

where the heck to i find that command at? i've looked all over tuner pro and can't find that.

RednGold86Z · 08-21-2006, 10:57 PM

What is your setup?
Are you using $6E in a '165, $32B in a '165, $8D in a 730, or some TBI, or something else?

I tried to attach a picture of Mask ID in tunerpro, but it's not attaching (no it's not too big or anything stupid like that). Basically, Mask ID is the second item in the Constants list.

bigburb93 · 08-22-2006, 06:54 AM

I'm using $E6, I see a PROM ID in the constants list (the value shows 6275), is that the same thing? I've tried changing it to AA or 0xAA to no avail.

Jekyll & Hyde · 08-22-2006, 10:06 AM

Are you using 32k chips? If so, don't foget to double stack it or it will always be in limp home mode because it can't find start of the program.

If you are using TunerPro as your burner, there is an option for it, although I can't tell you were to find it (it's not in front of me).

RednGold86Z · 08-22-2006, 10:24 AM

What's E6?

See what's at location 08. Change it to AA and try that. Also, yeah, make sure you're stacking stuff right (easiest way), or at least starting at the bin at the right offset, and loading the buffer right, etc...

Jekyll & Hyde · 08-22-2006, 12:37 PM

I think it's a typo for 6E.

bigburb93 · 08-22-2006, 01:31 PM

E6 is the computer for a 93 tbi truck, i'll upload a screenshot of what i see tomorrow, because i don't see mask ID anywhere in the constants

Mangus · 08-22-2006, 05:32 PM

Quote:

Originally Posted by bigburb93

E6 is the computer for a 93 tbi truck, i'll upload a screenshot of what i see tomorrow, because i don't see mask ID anywhere in the constants

Open TunerPro, hit Ctrl + H, and look at location (address) 0x08. It should say E6. If it does, change it to AA.

However, I don't think this is likely to fix your issue. You mention that you "emulated your stock chip." What does that mean? That you uploaded the stock chip to the emulator and tried? Or did you put your stock chip back in? If the former, remove the emulator from the equation and physically put your stock chip back in the ECM and see if it works. If the latter (you tried your physical stock chip), then your ECM might be dead.

bigburb93 · 08-23-2006, 07:00 AM

location 08 shows FF on my bin, guess i'll change it to AA today and see what happens

RBob · 08-23-2006, 08:30 AM

Try location $4008 for the maskid. This cal is one that uses bank selected portions of the EPROM.

RBob.

HaulnA$$ · 08-23-2006, 11:21 AM

The mask ID is definetly at L4008. See the attached pics. You need to setup TunerPro to calculate the checksum correctly. Hit CTRL-F2 to see the XDF header info and set it ilke the first pic. If you are using TunerProRT you will also need to set emulation to disable the checksum by loading AA al 4008 in the ALDL/Emulation section of the "Preferences" tab under the tools menu. See the second pic. HTH

JP86SS · 08-23-2006, 12:23 PM

Quote:

Originally Posted by bigburb93

location 08 shows FF on my bin, guess i'll change it to AA today and see what happens

Your reading something wrong or dumping the wrong locations from the base file your using. Should not be FF everywhere.

HaulnA$$ · 08-23-2006, 12:31 PM

Quote:

Originally Posted by JP86SS

Your reading something wrong or dumping the wrong locations from the base file your using. Should not be FF everywhere.

For the $E6 mask (64KB, 27C512), $FF is normal for locations L0000 to L3FFF. The calibration does not start until L4000. Checksum is a double byte at L4006. Mask ID at L4008. HTH

bigburb93 · 08-23-2006, 01:35 PM

thankyou haulin for your expert input, i was really confused there for a minute you cleared things right up for me.

bigburb93 · 08-26-2006, 04:23 PM

got it working, thanks again haulin and all others for your input

bigburb93 · 08-28-2006, 07:03 PM

ok i guess i was just kidding about that statement earlier, it drove like a bat out of hell on saturday and when i started it up this morning it died, then on the next start it went into limp home mode. disconnected the computer for the rest of the day at work, and when i went to drive it home plugged it back in and it drove fine for about 10 seconds then screwed up again. guess i'll try lookin at the code again tonight