Can anything else go wrong?!?! UGHH Help!!!

[robertisaar]

I saw a screenshot of HP Tuner scanning a PCM and the VIN# is there

i would hope so! the 94-95 3100 stores the VIN in the PCM as well...

[IsaacHayes]

Robert, can we read that from a .adx file? IIRC the aldl stuff had some mention of that, but I can't be sure. Just curios more than anything.

[robertisaar]

yes, you can read the VIN from the datastream. it's actually how i'm going to start hacking through the PCM if/when i can get the BIN off of it. the stack pointers should gove away the location of the main datastream, and then i'll have most of the RAM values figured out. then it's just deciphering the machine code after that!

[pocket-rocket]

yes, you can read the VIN from the datastream. it's actually how i'm going to start hacking through the PCM if/when i can get the BIN off of it. the stack pointers should gove away the location of the main datastream, and then i'll have most of the RAM values figured out. then it's just deciphering the machine code after that!

You make it sound soooo easy

I guess if I had enough attention span to sit down and read something for more than 15 minutes I could learn some stuff to. Stupid video games and TV (killed my attention span)!!! Has anyone tried that Focus Factor stuff? I saw it at Walgreens on a shelf once and if it was worth it I might start taking it so I have an attention span longer than 10 minutes, I might learn something like this that way...

[robertisaar]

You make it sound soooo easy \

it's actually SO easy, i anticipate it taking a solid year, minimum...

[Schmieder]

yes, you can read the VIN from the datastream. it's actually how i'm going to start hacking through the PCM if/when i can get the BIN off of it. the stack pointers should gove away the location of the main datastream, and then i'll have most of the RAM values figured out. then it's just deciphering the machine code after that!

I think it is cool you are getting into the deeper end of the PCM through your own methods.

[robertisaar]

I think it is cool you are getting into the deeper end of the PCM through your own methods.

ask any of the major people involved in this type of thing and you'll get roughly the same method.

luckily, the PCM SHOULD store the VIN sequentially in ASCII somewhere in the BIN, so i just have to search for it, then i'll have found the mode 1, message 4 info. then i just need to backtrack a little to get to the mode 1, message 0 and 2 info, then i'll have all of the RAM stored locations of the important values, then i can deduce what tables do what based on what the ECU is told to do with them.

sounds easy, takes forever.

[Schmieder]

ask any of the major people involved in this type of thing and you'll get roughly the same method.

luckily, the PCM SHOULD store the VIN sequentially in ASCII somewhere in the BIN, so i just have to search for it, then i'll have found the mode 1, message 4 info. then i just need to backtrack a little to get to the mode 1, message 0 and 2 info, then i'll have all of the RAM stored locations of the important values, then i can deduce what tables do what based on what the ECU is told to do with them.

sounds easy, takes forever.

I've hacked cell phones, WEP keys, security cameras, software but never a vehicles pcm, not yet. And it seems you have a good deal of knowledge there regarding. Your approach seems logical. You got balls hacking straight code. It's a royal pain in the butt.

Oh boy do I know the 'sounds easy, takes forever'. Many sleepless nights on a random project. When I get a bone to do something, I can't quite until I get it. I'm a persistent little b@st@rd...lol

[RedZMonte]

search cars.com or autotrader.com for a 1997 Lumina, Monte carlo, Cutlass whatever that is the same motor/tranny config as your car. Input the vin to the program and go.. that is what i did originally with mine.. my car thinks its a '96 GTP. the only thing the vin is used for ever is to update the computer if there is a TSB or somthing from the manuf. emmissions don't check vins.

S

[Schmieder]

search cars.com or autotrader.com for a 1997 Lumina, Monte carlo, Cutlass whatever that is the same motor/tranny config as your car. Input the vin to the program and go.. that is what i did originally with mine.. my car thinks its a '96 GTP. the only thing the vin is used for ever is to update the computer if there is a TSB or somthing from the manuf. emmissions don't check vins.

S

Thanks. I believe that was the last possible road block I had to resolve.

I have flange blueprints for the proper bolts (rated to withstand the heat), dimensions for grinding pipe to weld, spare hoses, extra wire, lots of clean shop rags, check valves, various notes, lots of light, heated garage and a hot wife.

Replacing every gasket on the block, new head bolts, complete oil/trans/coolant flush, paint job, the works.

When I'm done I will be proud to post before and after pics.

[3400-95-Modified]

This is the ONE reason why I like my DHP unit... If I want multiple PCM's I can do that without having to worry what the vin is... I currently tune 4 different ones between my 2 cars.

I also like the fact that I can get ANY 058 Ecm from any car that came with one and then fully write it to make it a 1997 Venture ECM so I can use it. I know HP tuners has to support the OSID of the ECM you get for it to work and you can't do a full flash on say a 97 transporter ECM to make it into the supported 97 Monte or Lumina.

[Schmieder]

This is the ONE reason why I like my DHP unit... If I want multiple PCM's I can do that without having to worry what the vin is... I currently tune 4 different ones between my 2 cars.

I also like the fact that I can get ANY 058 Ecm from any car that came with one and then fully write it to make it a 1997 Venture ECM so I can use it. I know HP tuners has to support the OSID of the ECM you get for it to work and you can't do a full flash on say a 97 transporter ECM to make it into the supported 97 Monte or Lumina.

Pros & cons.

So I can't swap ECM OS's? If I understand you correctly I can't flash a 97 Monte .bin to a 97 Lumina? But I could if I had also changed the VIN to match the vehicle OS. But that would cost credits.

I could always view and import settings from one to the other, just a little time.

Now, does HP Tuners support free writting to the PCM/ECM? As in, can I write code and have it flashed to the PCM? So I can add a feature or edit current hard code.

I don't see why not. I guess all I need to do is write the code to the .bin, compile it and flash.

I'm only really needing to tune 2 cars at the most. So HPT is fine. Though, a DHP is nice in many ways, one being a LOT cheaper.

[Weatheralls Auto]

Your question has been answered here and at HPtuners

The Vin stays with the Pcm,
you can flash a so called 97 Monte file to a 97 Lumina PCM as long as the 97 Lumina PCM has the same Vin flashed to it as the 97 Monte you are licenced for

[pocket-rocket]

This makes me happy I plan on staying OBD1 for some time