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'[PIC] PIC based OBD II for J1850?'
2006\02\12@055638 by Vitaliy

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[Fixed tag.]

Harley Shanko wrote:
> Curious if anyone has ever run across/done a design (HW/FW) for a
> PIC-based
> OBD II for GM vehicles (uses the J1850 standard)?
>
> I've been using PIC16F87x for several years.  Probably is overkill for
> this
> project, but have some pcbs which probably could be used to prototype such
> a
> design.  Save doing a pcb for it.  To start it would probably display on a
> 4
> line x 20 char LCD.
>
> Any ideas, suggestions, etc. would be greatly appreciated.
>
> Harley
> ps - this is mainly as a learning experience

J1850 VPW to RS232 interpreter based on a PIC12C509 (proprietary, no code):
   http://www.elmelectronics.com

FlexScan - based on a MC68HC58 (schematics, assembly source):
   http://www.fieros.de/en/flexscan.html

OBD Scanner by Jay Shroff (Circuit Cellar project):
   http://www.circuitcellar.com/psoc2004/winners/c2974.htm

AVR-Based Fuel Consumption Gauge (Circuit Cellar project):
   http://www.circuitcellar.com/advertise/cc-advertising/Lightner-183.pdf

Automotive Scan Tool by George Kaldis (Circuit Cellar project):
   http://www.circuitcellar.com/renesas2005m16c/winners/DE/1756.htm

ScanTool.net, LLC (the company I work for) Forum:
   http://www.scantool.net/forum/

OBD2Cables.com - in case you decide to buy an OBD-II cable for your project:
   http://www.obd2cables.com

Best regards,

Vitaliy

2006\02\12@190449 by Harley Shanko

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Thank you Vitaliy for the references for my OBD question.

A friend once wrote "you provided me with more information than I wanted to
know." Guess I overwhelmed him with what I mailed to him (pre-Internet era.)
What you provided will keep me busy browsing, reading, searching for some
time.  Many Thanks.

I also joined the ScanTool forum.  I wasn't aware such a site existed.
Probably was there before, looked familiar, but was looking for certain info
and didn't note the 'forum'.  Another lesson learned.

Harley

--------------------------------- ref:
Message: 27
Date: Sun, 12 Feb 2006 03:56:37 -0700
From: "Vitaliy" <spam_OUTspamTakeThisOuTspammaksimov.org>
Subject: Re: [PIC] PIC based OBD II for J1850?
---------------------------------



2006\02\13@111858 by blackcat

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Slightly off the subject

Before ODB II ( about 1996 I guess ) there were proprietary
diagnostic schemes.  Is there anyplace to find out information about
these ?
In particular, Ford Explorer 1991

Thanks

AGSC


Augustus Gustavius Salvatore Calabrese 720.222.1309    AGSC
http://www.omegadogs.com   Denver, CO      cell 303 908 7716
If SPAM filters bounce mail, try
.....ags.calabreseKILLspamspam@spam@hotmail.com


2006\02\13@133419 by Paul James E.

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AGSC,

This vehicle uses OBD I.   Under the hood, usually on the drivers side of
the vehicle, there will be a black connector.  It looks sonmething like
shown here.

     ____________
    /            \
  /    [ ] [1]    \
 | [ ] [2] [ ] [ ] |
  ------------------

There will also be a single connector adjacent to the one above.  If you
connect the single connector to pin #1 above, you will put the EEC-IV into
diagnostic mode.

Connect a volt meter (or a 12 volt test lamp) to pin #2 (negative terminal
for the voltmeter).  Connect the positive terminal of the voltmeter to the
battery plus.

Now when you put the key in the iginition and turn it on, (don't
start the engine) the lamp will come on (or the voltmeter will deflect
positive)The lamp will then blink off for each count in the digit.
For example, it comes on, goes off, comes on, goes off, comes on, goes
off, comes on, and then pauses, this is three.  And so on for the remaining
digits.  You then look up the corresponding code to find the area of
difficulty.

There are several places on the web to look these codes up.  If you can't
find any place else, let me know and I'll look the up for you.

                                               Regards,

                                                 Jim  




{Quote hidden}

> --

2006\02\14@002631 by Vitaliy

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blackcat wrote:
> Slightly off the subject
>
> Before ODB II ( about 1996 I guess ) there were proprietary
> diagnostic schemes.  Is there anyplace to find out information about
> these ?
> In particular, Ford Explorer 1991

Why is it that a lot of people prefer to spell "OBD II" as "ODB II"? It
doesn't make sense to me (an ESL person). Does it make sense to native
English speakers?

Just curious...

Best regards,

Vitaliy

2006\02\14@003425 by David VanHorn

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>
> Why is it that a lot of people prefer to spell "OBD II" as "ODB II"? It
> doesn't make sense to me (an ESL person). Does it make sense to native
> English speakers?


B and D pronounce very similarly. There's a name for that phenomena, but I
forgot it.

2006\02\14@003744 by Mark Rages

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On 2/13/06, Vitaliy <.....spamKILLspamspam.....maksimov.org> wrote:
> blackcat wrote:
> > Slightly off the subject
> >
> > Before ODB II ( about 1996 I guess ) there were proprietary
> > diagnostic schemes.  Is there anyplace to find out information about
> > these ?
> > In particular, Ford Explorer 1991
>
> Why is it that a lot of people prefer to spell "OBD II" as "ODB II"? It
> doesn't make sense to me (an ESL person). Does it make sense to native
> English speakers?
>
> Just curious...

maybe it's in remembrance of this guy: http://en.wikipedia.org/wiki/ODB

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