Re: [opendiag] Re: kwp71 commands including EPROM reading

Thanks sander,
 
That was a great .pdf. So if I'm right this protocole should work for the almost all ISO-9141 cars.
 
(Does anybody know if I can find this kind of information in HS 3000 book from SAE?)
 
And a very amature question.... Bulent said that the difference is just between keywords that specifies the protocol. But what is the difference between different protocols? Are they more or less the same? and If they are thesame (BUT just the keywords) why are there different KWxxx out there?
 
Thanks for any help and answering my newbee questions.

Bülent Özen <ozenelekt@...> wrote:

Hi

the only difference between KW71 and KW1281 is keywords

The keyword tells which protocol is used. The keyword is read as 8 bit no parity, but is actually send as 7 bit odd parity. The two seven bit numbers( 8a ---> 0a and 8f ---> 0f 80h ---> 0 ) will give a 14 bit number asfollows:

(KW2 X 128) + KW1 = protocol number.

KW71 keywords are ---> C7h and 80h ( with parity )----> 47h and 0 ( w/o parity )

(0x00 X 128) + 0x47 = 1281 (KWP 71)

(0x0a X 128) + 0x01 = 1281 (KWP 1281)

(0x09 X 128) + 0x77 = 1271 (KWP 1271)

(0x0f X 128) + 0x50 = 2000 (KWP 2000)

B/R

Bülent

----- Original Message -----
From: Sander
To: opendiag@yahoogroups.com
Sent: Monday, September 01, 2003 1:54 PM
Subject: [opendiag] Re: kwp71 commands including EPROM reading

As far as I know, a lot of the commands for kwp1281 are the same as
for kwp71 (I (also) don't know what exactly kwp71 is). There are a
few specific ones. Of course the interpretation of the data can be
different too, for example with the data replied on the faultcode
diagnose.

Sander.

--- In opendiag@yahoogroups.com, "Ken Wilson" <wilsonkrg@o...> wrote:
> Thanks Sander,
>
> Most of us would not have realised that this was equivalent to
KWP71.
> Is there something out there similar to KWP1281 that you could
point
> us too as well please. Thanks in advance.
>
> Ken W (Aust)
>
>
>
> --- In opendiag@yahoogroups.com, "Sander" <sander.qv@z...> wrote:
> > I saw several questions on this subject and the answer is already
> in
> > this group!
> >
> > See the following file (thanks to the one who uploaded it!):
> > http://groups.yahoo.com/group/opendiag/files/Fiat/07273.pdf
> >
> > Although this is for fiat, most of the kwp71 commands are the
same
> > for every car. As can be seen in the file, the command to read
the
> > EPROM is 0x03 followed by the number of bytes and the address to
> > start.
> >
> > Bye, Sander.

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Received on Mon Sep 01 08:38:32 2003