Re: Scan-tool with PIC

Hi Richard,
I receive KW2 and send it inverted. But I don't receive CC. I
could get the part number, but in the next comm. block, I always
receive FC. Do you have some tech docs?
Thank you, Ezequiel
--- In opendiag@yahoogroups.com, Richard J Lebens <rick-l@r...>
wrote:
> Does VW follow ISO-9141 or do I have an old version? If you read
the
> spec dated Dec 1996 it shows the header to consist of the tester
> sending 33 at 5 bits per second, response from ecu of 55 (timing
sync)
> 08 (KW 1) 08 (KW2) and then the tester responds with the inverse
of KW
> 2 (F7 hex). The ecu then sends the inverse of the address (CC)
and it
> is ready for the first message request. The ECU should respond in
25 -
> 50 mSec.
>
> I'm wanting to try this also but am using Motorola's new cheapie
micro
> controllers.
>
>
> > Message: 1
> > Date: Wed, 04 Dec 2002 15:48:29 -0000
> > From: "acetoel" <Nik@i...>
> > Subject: Re: Scan-tool with PIC
> >
> > Hi,
> > I'm making a Scann tool with PIC for VW. I made my own
interfase,
> > which works okey, and succesfully receive 0x55 0x01 and 0x8A
from
> > the ECU. Then I have some problems with timming. I don't know
how
> > much time do I have to wait after sending the ACK byte and so
on.
> > Could you provide this info (time between bytes and so on) that
you
> > have on the ISO documents. I can send you the diagram of my
> > interfase which works Ok with a PIC16F73. Thank you
> > Ezequiel
> > nik@i...
>
>
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Received on Fri Dec 20 20:38:37 2002