Lpc2000

> -----Original Message-----
> From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
> Of Onestone
> Sent: Friday, January 06, 2006 4:03 PM
> To: lpc2000@yahoogroups.com
> Subject: Re: [lpc2000] Re: J1939 stacks for the LPC2xxx's?
> 
> This gleaned from  agoogle for J1850 COMMANDS. tHE 808 MENTIONED IS A
> gENERAL mOTORS hOLDEN (aUSTRALIAN) vehicle.
> 
> maybe this will be of some help.

Thanks for the reply,

I've found tons of OBDII diagnostic code info but nothing on how to get the
code.

From my fiddling around with an OBDII scanner and a laptop with a USB CAN
interface OBDII is command driven protocol.  If I want the transmission
temperature I have to send a CAN packet with a certain ID, then the engine
controller sends the response back in a different CAN packet.

I was able to get the scanner to just read trans temp and nothing else.  I
then saw two CAN packets on the OBDII bus.  I was then able to determine
which packet was the actual command and which packet was the response by
using my laptop to send a command.  With the scanners help I was able to
figure out which bytes in the packet was the tran temp data and what math I
had to do to get the actual temperature.

So I guess in short, what I need are the commands that get the codes.  I've
found enough info to figure out the codes.

Thanks again!

Greg Deuerling