[Diy_efi] OBD2 emulation

[Steve Ravet]

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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