[Diy_efi] OBD2 emulation

[Bobby Yates Emory]

Steve,

I don't think he wanted to be able to run the OBD 2 test.  I think he just
wanted to put the correct signals to the OBD 2 connector so the OBD 2 scan
tool reports that there are no codes stored.

That should be simpler, but your freescale idea may be a good way to do it.

Bobby


On 4/2/07, Steve Ravet <Steve.Ravet at arm.com> wrote:
>
> I saw one time the flowchart used by the OBD 2 test.  Part of it is
> illuminating the check engine light so you'd have to wire to it as well
> as the OBD2 connector.  The short answer to your question is that it
> certainly can be done, with a cheap freescale MCU that has a BDLC.  I've
> not heard of anyone doing it, though, so you'd have to do it from
> scratch.  There's probably a demo board in the couple hundred dollar
> range from freescale or another supplier that would give you the
> hardware you needed, if so you'd just have to hunt up the flowchart for
> the test and write firmware to implement it.
>
> --steve
>
> > -----Original Message-----
> > From: diy_efi-bounces at diy-efi.org
> > [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Jason D.
> > Sent: Saturday, March 31, 2007 1:16 PM
> > To: diy_efi at diy-efi.org
> > Subject: [Diy_efi] OBD2 emulation
> >
> > I don't know if this has come up before, but for those who
> > have OBD2 GM vehicles and have used a different ECU to allow
> > you to tune it, what can you do to pass emissions?  The
> > emissions check where I live is a simple plug in test to the
> > computer where they just check for codes and see if it lists
> > as "ready" on the emissions pre-tests.  SO, is it possible to
> > emulate an OBD2 port on the vehicle?  Or even hack a 2nd obd2
> > ecu to just say all is well?  Swapping back to the old ecu is
> > not possible as it isn't hackable nor could it even the run
> > the engine if I wanted it to.  Thanks.
> >
> >
> >
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-- 
Toward freedom,

Bobby Yates Emory