Cummins Specific PID's

[biggy238]

But you see what I am meaning, although it's the mode you have, it may be the limitation in and of itself

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[4x4dually]

Nope. I don't see. I'm totally confused.

No, really....I have no idea what you mean.

[EverydayDiesel]

Lol i am lost too.

This is serial baud communications and is nothing like tcp/udp/icmp protocols

[biggy238]

Originally Posted by 4x4dually

I've been out of pocket....but here I is.

So, what I've managed to figure out with a little help from another person. This works on my 2009....I think 2007.5-2009 are the same. I have no idea if it applies to any other year model. It's not as easy as sending a two digit code.

The ECM address is 0x000007E0. Any response will be that address plus 8 so the responses come from 0x000007E8. You will need to put the ECM into "diagnostic" mode by sending it a string of bits. Then you will request the blocks of data you want. The messages to and from the ECM will be 8 bytes consisting of 8 bits each. The RPM is located byte 6 and 7 from the PID 0x21 located in block 22.

That is the one paragraph response....so chew on that for a while and see if it gets you anywere.

My problem is that I can't seem to get the timing down. I know exactly what my tuner is sending and what comes back....but I just can't make it respond to requests that I send. Basically all I'm doing it parsing out the data captured from the bus as it goes past my display to the programmer. The programmer is doing all the requests, I just know where all the data is buried in all the packets.

"you will need to put the ECM into diagnostic mode"

In my limited understanding, you don't need diagnostic mode to query a parameter under normal protocol operation. Other nodes on the vehicle aren't plunging in and out of "diagnostic mode" when they query the bus for a parameter. That's why I wanted to know what diagnostic mode entails

It may be the means you have to access the information, but sending a string under the pretense of diagnostics may be a limitation.

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[4x4dually]

I see what you mean now. That is the only way that I know to do it. I would hope to God there are easier ways and I sure hope I learn them in the future.

[EverydayDiesel]

I am not sure about the diag mode but I can tell you that you initiate requests and the ecm will reply back with a value. The goal of this thread was to get the units the value is stored in so that a conversion might be done.

[4x4dually]

Originally Posted by EverydayDiesel

I am not sure about the diag mode but I can tell you that you initiate requests and the ecm will reply back with a value. The goal of this thread was to get the units the value is stored in so that a conversion might be done.

If that was all you need..../thread.

[biggy238]

Homie don't play!

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[4x4dually]

Trans Pressure is 1 over J42 * PID 12 divided by mosquito.

Does that help, Kyle?

[EverydayDiesel]

Originally Posted by biggy238

Homie don't play!

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I dont think so (I couldnt find one with a sock)




Anyways, its not quite as simple as I make it but thats the general idea. We can leave this thread open and if anyone ever knows the pid's and the conversions please post it! Hopefully someone will have these values someday.