V6 ability for pcm hammer.

They go by many names, P01, P59, VPW, '0411 etc . Circa 1999 to 2006. All VPW OBD2 PCMs.
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Re: V6 ability for pcm hammer.

Postby kur4o » Wed Nov 18, 2020 8:53 am

You can open the script file in text editor. The last big message is what you need. It have some extra bytes, byte counts, the header bytes and checksum but you will figure it out.

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Re: V6 ability for pcm hammer.

Postby Gampy » Thu Nov 19, 2020 8:49 pm

I think you give me more credit then I deserve ... I am not the Opcode wizard you are! :cry:

However, I did come up with 1240 (4D8) bytes I believe to be it.
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Re: V6 ability for pcm hammer.

Postby kur4o » Fri Nov 20, 2020 8:12 am

That is really not good. ACtually it is $4e4 bytes with header and checksum. How much is the buffer of the tool you are using. And how much is the total that will work.

There isn`t any left for cutting unless some functionaly is lost.

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Re: V6 ability for pcm hammer.

Postby antus » Fri Nov 20, 2020 8:59 am

4e4 is 1253 bytes, plus header is 12.
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Re: V6 ability for pcm hammer.

Postby Gampy » Fri Nov 20, 2020 9:02 am

Header and checksum are $C bytes, correct ??

Thus, $4E4 - $C = $4D8 byte payload.

What functionality does it have other then receive, checksum, write, execute at address.

Less then $400 bytes is my goal ... May be an impossible goal.
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Re: V6 ability for pcm hammer.

Postby kur4o » Fri Nov 20, 2020 9:20 am

Send short message can be cut, but there will be no conformation on the status of the recieved messages. You will be uploading blind and hope it works in the end.
There is block checksum that can be cut and it won`t refuse any bad messages.

I will look what else can be cut, but it will definitely cripple it someway.

The workaround will be upload crippled version, than upload good full version than upload whatever you like.

I think $400 is the maximum threshold for something usable.

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