Electronics-Related.com
Forums

How to send commands to ELM327 OBD interface

Started by powerampfreak November 24, 2012
Well close. The Infiniti socket is 16 pins and so is standard ODBII. But 
this is a 14 to 16 pin adapter.

And I thought only Apple uses GD proprietary connectors.

The shop manual calls the ODBII scanner the GST (general scanner tool), 
just to make the manual harder to read I suppose.

BTW, if you never did it, for like $20 or so, there are websites that 
let you download the official manuals. I suppose there are pirated 
manuals as well, but $20 seems fair considering what cars cost. You get 
a one day subscription to the service. it is really intended for repair 
shops.

On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com>
wrote:

>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak ><powerampfreak@hotmail.com> wrote: > >>Great guys! >>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so=
probably I can set up another PIC through the USART and communicate with= the ELM.
>>And possibly use a 2x16 char LCD display to show the parameters. Brill =
!!!
> >This forum and article might be of some help. >"free OBD2 software with MPG calc" ><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7=
490.html>
> >Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >The plan was to leave it plugged into my vehicle OBD2 connector and >have it communicate performance numbers via BT to my Droid X phone >while driving. The plan was ruined when I found myself with a dead >car battery the next morning. It seems that the Mini ELM327 does not >turn off when the ignition key is off, and continues to draw power. >Actually, it drew enough power to get hot enough to partially melt the >blue plastic case. A quick survey of other such devices indicates >similar problems. I had to crack the case to install an on-off >switch.
There is something weird about this, a PIC eating enough power to flatten a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the case??? Where in hell is all that energy going? ???-)
On Tue, 27 Nov 2012 00:41:42 -0800, josephkk
<joseph_barrett@sbcglobal.net> wrote:

>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> >wrote: > >>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak >><powerampfreak@hotmail.com> wrote: >> >>>Great guys! >>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so probably I can set up another PIC through the USART and communicate with the ELM. >>>And possibly use a 2x16 char LCD display to show the parameters. Brill !!! >> >>This forum and article might be of some help. >>"free OBD2 software with MPG calc" >><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7490.html> >> >>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >>The plan was to leave it plugged into my vehicle OBD2 connector and >>have it communicate performance numbers via BT to my Droid X phone >>while driving. The plan was ruined when I found myself with a dead >>car battery the next morning. It seems that the Mini ELM327 does not >>turn off when the ignition key is off, and continues to draw power. >>Actually, it drew enough power to get hot enough to partially melt the >>blue plastic case. A quick survey of other such devices indicates >>similar problems. I had to crack the case to install an on-off >>switch. > >There is something weird about this, a PIC eating enough power to flatten >a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the >case??? Where in hell is all that energy going? > >???-)
And someone with no knowledge that vehicles DO have "accessory" power that goes off when the ignition switch is off :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
Jim Thompson wrote:
> > On Tue, 27 Nov 2012 00:41:42 -0800, josephkk > <joseph_barrett@sbcglobal.net> wrote: > > >On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> > >wrote: > > > >>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak > >><powerampfreak@hotmail.com> wrote: > >> > >>>Great guys! > >>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so probably I can set up another PIC through the USART and communicate with the ELM. > >>>And possibly use a 2x16 char LCD display to show the parameters. Brill !!! > >> > >>This forum and article might be of some help. > >>"free OBD2 software with MPG calc" > >><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7490.html> > >> > >>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. > >>The plan was to leave it plugged into my vehicle OBD2 connector and > >>have it communicate performance numbers via BT to my Droid X phone > >>while driving. The plan was ruined when I found myself with a dead > >>car battery the next morning. It seems that the Mini ELM327 does not > >>turn off when the ignition key is off, and continues to draw power. > >>Actually, it drew enough power to get hot enough to partially melt the > >>blue plastic case. A quick survey of other such devices indicates > >>similar problems. I had to crack the case to install an on-off > >>switch. > > > >There is something weird about this, a PIC eating enough power to flatten > >a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the > >case??? Where in hell is all that energy going? > > > >???-) > > And someone with no knowledge that vehicles DO have "accessory" power > that goes off when the ignition switch is off :-)
On the OBDII diagnostic port?
On Tue, 27 Nov 2012 00:41:42 -0800, josephkk
<joseph_barrett@sbcglobal.net> wrote as underneath my scribble :

>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> >wrote: > >>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak >><powerampfreak@hotmail.com> wrote: >> >>>Great guys! >>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so probably I can set up another PIC through the USART and communicate with the ELM. >>>And possibly use a 2x16 char LCD display to show the parameters. Brill !!! >> >>This forum and article might be of some help. >>"free OBD2 software with MPG calc" >><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7490.html> >> >>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >>The plan was to leave it plugged into my vehicle OBD2 connector and >>have it communicate performance numbers via BT to my Droid X phone >>while driving. The plan was ruined when I found myself with a dead >>car battery the next morning. It seems that the Mini ELM327 does not >>turn off when the ignition key is off, and continues to draw power. >>Actually, it drew enough power to get hot enough to partially melt the >>blue plastic case. A quick survey of other such devices indicates >>similar problems. I had to crack the case to install an on-off >>switch.
>There is something weird about this, a PIC eating enough power to flatten >a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the >case??? Where in hell is all that energy going? >
I have had one of these clone ELM bluetooth units for about a year 1.5 version, no signs at all of overheating, gets slightly warm in use as you wd expect, I dont leave it plugged in doing nothing though....! Maybe OP has been unlucky in his units, but it seems to be a known problem, look on Amazon comments etc. C+
On Mon, 26 Nov 2012 00:18:50 -0800, miso <miso@sushi.com> wrote:

>Well close. The Infiniti socket is 16 pins and so is standard ODBII. But=
=20
>this is a 14 to 16 pin adapter. > >And I thought only Apple uses GD proprietary connectors.
Bwahahahahah. Large companies have been using proprietary connectors since there were connectors, well over 100 years. How could you possibly be that naive?
> >The shop manual calls the ODBII scanner the GST (general scanner tool),=20 >just to make the manual harder to read I suppose. > >BTW, if you never did it, for like $20 or so, there are websites that=20 >let you download the official manuals. I suppose there are pirated=20 >manuals as well, but $20 seems fair considering what cars cost. You get=20 >a one day subscription to the service. it is really intended for repair=20 >shops.
On Tue, 27 Nov 2012 08:34:23 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

>On Tue, 27 Nov 2012 00:41:42 -0800, josephkk ><joseph_barrett@sbcglobal.net> wrote: > >>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> >>wrote: >> >>>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak >>><powerampfreak@hotmail.com> wrote: >>> >>>>Great guys! >>>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, =
so probably I can set up another PIC through the USART and communicate = with the ELM.
>>>>And possibly use a 2x16 char LCD display to show the parameters. =
Brill !!!
>>> >>>This forum and article might be of some help. >>>"free OBD2 software with MPG calc"
^^^^^
>>><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc=
-7490.html>
>>> >>>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >>>The plan was to leave it plugged into my vehicle OBD2 connector and >>>have it communicate performance numbers via BT to my Droid X phone >>>while driving. The plan was ruined when I found myself with a dead >>>car battery the next morning. It seems that the Mini ELM327 does not >>>turn off when the ignition key is off, and continues to draw power. >>>Actually, it drew enough power to get hot enough to partially melt the >>>blue plastic case. A quick survey of other such devices indicates >>>similar problems. I had to crack the case to install an on-off >>>switch. >> >>There is something weird about this, a PIC eating enough power to =
flatten
>>a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt =
the
>>case??? Where in hell is all that energy going? >> >>???-) > >And someone with no knowledge that vehicles DO have "accessory" power >that goes off when the ignition switch is off :-) > =09 > ...Jim Thompson
This is on the OBD2 connector, which does not depend on the ignition switch position. Please pay attention properly. ?-)
On Wed, 28 Nov 2012 01:19:48 -0800, josephkk
<joseph_barrett@sbcglobal.net> wrote:

>On Tue, 27 Nov 2012 08:34:23 -0700, Jim Thompson ><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: > >>On Tue, 27 Nov 2012 00:41:42 -0800, josephkk >><joseph_barrett@sbcglobal.net> wrote: >> >>>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> >>>wrote: >>> >>>>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak >>>><powerampfreak@hotmail.com> wrote: >>>> >>>>>Great guys! >>>>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, so probably I can set up another PIC through the USART and communicate with the ELM. >>>>>And possibly use a 2x16 char LCD display to show the parameters. Brill !!! >>>> >>>>This forum and article might be of some help. >>>>"free OBD2 software with MPG calc" > ^^^^^ > > >>>><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7490.html> >>>> >>>>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >>>>The plan was to leave it plugged into my vehicle OBD2 connector and >>>>have it communicate performance numbers via BT to my Droid X phone >>>>while driving. The plan was ruined when I found myself with a dead >>>>car battery the next morning. It seems that the Mini ELM327 does not >>>>turn off when the ignition key is off, and continues to draw power. >>>>Actually, it drew enough power to get hot enough to partially melt the >>>>blue plastic case. A quick survey of other such devices indicates >>>>similar problems. I had to crack the case to install an on-off >>>>switch. >>> >>>There is something weird about this, a PIC eating enough power to flatten >>>a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the >>>case??? Where in hell is all that energy going? >>> >>>???-) >> >>And someone with no knowledge that vehicles DO have "accessory" power >>that goes off when the ignition switch is off :-) >> >> ...Jim Thompson > >This is on the OBD2 connector, which does not depend on the ignition >switch position. Please pay attention properly. > >?-)
It doesn't? When I get smog-checked, they plug into the OBD2, then turn the key!!! ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food.
> > >There is something weird about this, a PIC eating enough power to flatten > >a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the > >case??? Where in hell is all that energy going? > > I have had one of these clone ELM bluetooth units for about a year 1.5 > version, no signs at all of overheating, gets slightly warm in use as > you wd expect, I dont leave it plugged in doing nothing though....! > Maybe OP has been unlucky in his units, but it seems to be a known > problem, look on Amazon comments etc. >
It's just bad designs/programmers. Poorly design products can kill any battery. Don't they know about low-power/idle/standby modes? Perhaps they do and will be ready to sell you an upgrade with a premium price.
"Jim Thompson" <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote in 
message news:88ccb85462kjpn3crskqb1r46t3n2icc2q@4ax.com...
> On Wed, 28 Nov 2012 01:19:48 -0800, josephkk > <joseph_barrett@sbcglobal.net> wrote: > >>On Tue, 27 Nov 2012 08:34:23 -0700, Jim Thompson >><To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote: >> >>>On Tue, 27 Nov 2012 00:41:42 -0800, josephkk >>><joseph_barrett@sbcglobal.net> wrote: >>> >>>>On Sun, 25 Nov 2012 09:02:42 -0800, Jeff Liebermann <jeffl@cruzio.com> >>>>wrote: >>>> >>>>>On Sun, 25 Nov 2012 00:44:42 -0800 (PST), powerampfreak >>>>><powerampfreak@hotmail.com> wrote: >>>>> >>>>>>Great guys! >>>>>>ELM327 is a pre-programmed PIC processor. It communicates by RS-232, >>>>>>so probably I can set up another PIC through the USART and communicate >>>>>>with the ELM. >>>>>>And possibly use a 2x16 char LCD display to show the parameters. Brill >>>>>>!!! >>>>> >>>>>This forum and article might be of some help. >>>>>"free OBD2 software with MPG calc" >> ^^^^^ >> >> >>>>><http://ecomodder.com/forum/showthread.php/free-obd2-software-mpg-calc-7490.html> >>>>> >>>>>Incidentally, I bought a Mini ELM327 BlueTooth on eBay to play with. >>>>>The plan was to leave it plugged into my vehicle OBD2 connector and >>>>>have it communicate performance numbers via BT to my Droid X phone >>>>>while driving. The plan was ruined when I found myself with a dead >>>>>car battery the next morning. It seems that the Mini ELM327 does not >>>>>turn off when the ignition key is off, and continues to draw power. >>>>>Actually, it drew enough power to get hot enough to partially melt the >>>>>blue plastic case. A quick survey of other such devices indicates >>>>>similar problems. I had to crack the case to install an on-off >>>>>switch. >>>> >>>>There is something weird about this, a PIC eating enough power to >>>>flatten >>>>a 12 V, 50 Ah or more battery in a few hours??? Hot enough to melt the >>>>case??? Where in hell is all that energy going? >>>> >>>>???-) >>> >>>And someone with no knowledge that vehicles DO have "accessory" power >>>that goes off when the ignition switch is off :-) >>> >>> ...Jim Thompson >> >>This is on the OBD2 connector, which does not depend on the ignition >>switch position. Please pay attention properly. >> >>?-) > > It doesn't? When I get smog-checked, they plug into the OBD2, then > turn the key!!! > > ...Jim Thompson > --
The 12 volts on the ODB2 connector is directly to the battery. It is on all the time.