OBD-II

[PeterS]

I too am looking at ODB-II for a BMW Z3 (97). I am in the process of 
putting together a VPW circuit based on the Harris chips. I'm surprised BWM 
would use the 9141 protocol, I would have expected either the VPW (10.4k) 
or the PMW (41.6k).

I'll check out carcomp though to see what they have.

Peter Shoebridge


-----Original Message-----
From:	Mike Fahrion [SMTP:mfahrion at bb-elec.com]
Sent:	Tuesday, July 29, 1997 2:02 AM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	Re: OBD-II

The OBDII Bible is SAE's HS-3000 (1997), $79US.  Available through
SAE's home page at www.sae.org.

I'd guess that the BMW uses ISO9141 type communications (one of
the three "standards" allowed under OBDII) - contact CarComp
(www.carcomp.com).  They offer a ISO9141 to RS-232 product.  If it
uses J1850 VPW communications (I doubt it), contact me....  CarComp
will be able to tell you if their tool will work on your car.  The
protocol and commands are (nearly) identical across the three types
of communications, but the hardware varies drastically.

I've got a bit of time invested in this OBDII thing, feel free to
email me specific questions and I'll do what I can.

Good Luck
-mike

> Hi there,
>
> I have some questions about the OBD-II system for BMW, and I hope some
> of You can help me.
>
> Are there any available and good place on Internet ? Where to find the
> failure codes, equipment to read the codes, information, etc. ?
>
> Or does any of You have any of this information to post ?
>
> Best regards
>
> Niclas Palmquist
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  
-=-=-
Mike Fahrion                mfahrion at bb-elec.com 
     http://www.bb-elec.com/
B&B Electronics Mfg Co      ph.(815) 433-5100 ext.215    fax (815) 434-7094 
707 Dayton Road                 PO Box 1040                  Ottawa IL 
61350
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  
-=-=-