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Canucker
Dodge Dakota
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11/06/2002
18:08:05
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 Subject: Flash through OBD-II Port?
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Is that how PCM flashes/software updates are done? or do they connect right to the PCM?
thanks!
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slow2dak
Dodge Dakota
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11/06/2002
19:02:25
|  RE: Flash through OBD-II Port?
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all flashes done by the dealer are thru the DLC(datalink connector) on the bottom of the dash.
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tekmon
Dodge Dakota
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11/07/2002
08:16:48
| RE: Flash through OBD-II Port?
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slow2dak
Is the DLC the same as the OBD-II port under the dash ?
If I can read the diag codes, can I flash the PCM ?
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Canucker
Dodge Dakota
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11/07/2002
10:13:05
|  RE: Flash through OBD-II Port?
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slow2dak, I think we're talking about the same port (OBD-II and DLC). Or at least that's the only one I've seen.
tekmon, the short answer: No. If it was possible to get your hands on some base code and the proper com commands to access the PCM, then it might be possible. This is what I'm trying to figure out.
I'm suprised no one has any software that allows you to access the PCM yet (shareware or something). I guess companies make more $$ by raping us up the a$$ to send our PCM to them so they can do it.
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OttawaDak
Dodge Dakota
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11/07/2002
11:17:09
| RE: Flash through OBD-II Port?
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I agree entirely Canucker. The PCM on our trucks should be easily modified once the proper commands and interface are obtained. I wish it was as easy to hack as my satellite dish :)
Good luck
OttawaDak
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Canucker
Dodge Dakota
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11/07/2002
14:30:40
| RE: Flash through OBD-II Port?
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working on it .. I've found the commands required to turn the PCM on so far ... and there's a ton of software out there that allows you to READ the PCM .. but still nothing on writing to it.
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graphiteRT
R/T
11/07/2002
15:37:56
| RE: Flash through OBD-II Port?
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Guys, there are several companies out there with far more time and resources who haven't got that far with these things(HyperTech and Superchips to name a couple). Sourcecode is only part of the issue. Base programs or reference tables are the other and even if you manage to crack into it, you won't be going anywhere without that info. That is Mike Leach Cos. current problem.
Would be nice if tuners were readily available like the F Body and Mustang guys have and I think the mindsets are slowly changing on this score, but it will be some time yet before much is out there.
Truth be told, 99% of the people have no business getting in there because they'll only destroy stuff with their efforts.
Bob
'01 Graphite CC R/T, MP headers, Magnaflow muffler into 'Cuda style exhaust, M1 2bbl, ported 2.02 R/T heads, custom grind cam, Crower SS rockers, Paxton Novi2000, Boyd's 20s w/Dunlop SP9000s
Soon: Viper 4 wheel discs
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tekmon
Dodge Dakota
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11/07/2002
16:42:56
| RE: Flash through OBD-II Port?
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Canucker
How are you connected,,, ??
How are you talking ??
graphiteRT, is correct most people (99%) should not be trying to reverse engineer something the manufacturer tries its best to hide.. its not as simple as connecting a computer and typing in "go faster"... but then on the other hand some people are computer machine code literate, and can say, 01100111 01101111 00100000 01100110 01100001 01110011 01110100 01100101 01110010, the same thing in the native language the imbedded machine speaks.
the good news is that they can change the future code in yet to be release vehicle computers, but whats in the '98 dak is there to stay. We can modify it however we want and yes like reverse engineering anything else you have to be in a position to smoke a few chips along the way.
Source code and refreence tables are needed, but if we all put our heads together maybe the information will become available..
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Canucker
Dodge Dakota
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11/07/2002
17:10:16
| RE: Flash through OBD-II Port?
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tekmon:
Haven't hooked up to my PCM yet but ...
The connection is a standard RS232 cable .. the Dodges use an ISO protocal ... a standard serial format. To communicate with the OBD port, you need a cable that plugs into the serial port of a PC ... but the voltage levels from the PC have to be converted to the 12V levels the PCM uses (i.e. an interface circuit needs to be made).
From there, its all a software thing. Like I said, there's a ton of shareware out there that can read and decode data from the OBD-II (i.e. scan tools), but writing is a different story.
What I'd like to do is to be able to look at the base tables that are already in place (and save them in a safe spot), then make changes to them. I mean they have to be in there somewhere right? so why not grab them from there?
The biggest obstacle is the encoding of the software .. who knows .. maybe I'm wishful thinking...
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slow2dak
Dodge Dakota
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11/07/2002
21:05:20
| RE: Flash through OBD-II Port?
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canucker, we are talking about the same port on the bottom side of the knee blocker on the instrument panel. if you are intrested in the cable to plug into the DLC i have access to about 20 of them. we might be able to work out something. lol, on tha DL.
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tekmon
Dodge Dakota
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11/08/2002
07:57:23
|  RE: Flash through OBD-II Port?
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slow2dak
I would be interested in one of those cables, asap. Send me an email tekman6536@yahoo.com
Canucker
We are on the same page... please point me to some of the shareware you know of that can read and decode. Thats a good start..
If the dealer does PCM flashes through the DLC/OBD port, connector on the bottom side of the knee blocker on the instrument panel, then with a little software and knowledge we can also, and its legal.
I've hooked up with a friends, viper owner, Ease Diag software, just read the basic stuff.. but it deos not seem to have an option to write. It uses a special cable with an adapter between the PC and the DLC.
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DCXengineer
Dodge Dakota
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11/08/2002
10:22:49
| RE: Flash through OBD-II Port?
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Good Luck!! All the tables for ignition timing, fuel curves, etc... are written in hex. Without our translator you will never figure it out.
Have a nice day.
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Canucker
Dodge Dakota
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11/08/2002
10:40:37
| RE: Flash through OBD-II Port?
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tekmon: just type in "OBD shareware" on any search engine and you'll find a bunch.
DCXengineer: c'mon ... tell us more of what you know (if you are infact what you say you are)
slow2dak: where are the cables from? do they have the hardware interface built in? how much?
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tekmon
Dodge Dakota
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11/08/2002
11:44:00
|  RE: Flash through OBD-II Port?
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DCXengineer,
Hex not the problem, "676f20666173746572", just let us in... and we'll decide whats next. You are correct tables offsets and values may be a bottleneck. What translator are you referring to ?
I may even smoke a motor or two along the way..
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graphiteRT
R/T
11/08/2002
12:35:42
| RE: Flash through OBD-II Port?
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I'm afraid you fellas may be oversimplifying what's inside one of these things. It's not a table or two, it's literally dozens along with the adaptive logic which has no "roadmap" that you can hack.
Like I said, several companies with much more in resources have tried with limited success. Figure that they surely had a few hackers give it a shot along the way, not to mention some former DCX people. They still haven't figured it out. Thinking you'll manage with a laptop and a cable is wishful thinking, I'm afraid. More power to ya for trying though. Good luck.
Bob
'01 Graphite CC R/T, MP headers, Magnaflow muffler into 'Cuda style exhaust, M1 2bbl, ported 2.02 R/T heads, custom grind cam, Crower SS rockers, Paxton Novi2000, Boyd's 20s w/Dunlop SP9000s
Soon: Viper 4 wheel discs
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Canucker
Dodge Dakota
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11/08/2002
12:44:41
| RE: Flash through OBD-II Port?
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yeah you're probably right R/T .. but where's the fun in not trying I say?
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