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Discussion Starter · #1 ·
I'm looking for information on software to read the codes and reset check engine light codes (DTCs). I'm also looking for an interface cable - OBD1 - preferrably a do it yourself to serial port cable. I'm really only interested in the OBD1 computers... I have a 91 'scort.
I've seen the code readers and the Essus is quite reasonable, $30 or so. But it won't reset CEL codes. Plus, you can't do any detailed diagnostics - like reading O2 sensor voltage, etc.
Somebody has to have "hacked" something together that is cheap...

If I don't find anything I may (choke, choke) try to program something if I could find out how the data is formatted. There should be plenty of information on the Ford computer, EEC-IV.

Any other geeks out there thinking about this? :?

Dan
 

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If you just want to get at the codes, I can tell you how to get them for free (OBD 1 only).

If you want to find some sort of home made concoction to replicate that of a snap-on scan tool, I can't help you. But if someone knows how to make a home made scan tool let me know as well, I'd love to make one :D

Matt 8)
 

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Can't really help you, but I would LOVE to figure this out myself. I thought about doing something like this quite a while ago, but didn't have the time to pursue it.

If you need any help creating the program, I'd love to help (10 years experience programming, and I'm a programmer for the Air Force, in other words, if I can't figure it out, I guarantee you I can find someone who can).
 

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Discussion Starter · #5 ·
fixitmattman said:
If you just want to get at the codes, I can tell you how to get them for free (OBD 1 only).

If you want to find some sort of home made concoction to replicate that of a snap-on scan tool, I can't help you. But if someone knows how to make a home made scan tool let me know as well, I'd love to make one :D

Matt 8)
If you just mean a copy of the codes (hard copy), no. I'm more interested in a home grown scanner / "tool" that can read as well as reset check engine light conditions.
When I had an old VW Vanagon there was a guy who had whipped up a complete "box." It would read and you could also drive with it and see how things were working - fuel injection, O2, etc.
Dan
 

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Are you sure it wasn't a snap-on scanner he had. Those will do that. Those things are great. If the wern't so much money, I'd have one myself. Once you've used one you've got to have one. If you want to clear OBD 1 codes I can tell you how to do that as well. It's also in the Haynes manual.

Matt 8)
 

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Bah..the wire to connect your car to a computer cna be simple (I think) to make
Buy a little scanner cheap wherever, try to take off just the thing that connect to the car...
I think there is 8 wire in the little connector... so a Serial or Parralel port can be used for that..so take a old Serial Wire.. cut it...make it fit with the connector of the scanner...and there you have the wire...but...After...programming that isn't simple!!! Without diagram and all off that...
Personnaly...I cannot do that!
But if you can find it...I think you kinda have luck! :wink:
 

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Discussion Starter · #11 ·
rellimpk said:
Found this so far...
I'll add more as I find it, if I can find any more of course.
I like this one too, Ease
http://www.obd2.com/personal/personal_scantool.htm
and this one is DOS based, Diacom
http://216.230.203.183/auto/auto.htm

This is a neat code reader, the Equus 3145, $33!
http://www.midwayautosupply.com/detaile ... n.asp?3829

I found these pages and they're interesting as well (reference),
http://www.rs20004x4.co.uk/enginemanagement2.htm
http://www.btinternet.com/~madmole/Refe ... ading.html
http://www.btinternet.com/~madmole/Refe ... Codes.html

Other than the code reader most of the software / interfaces are fairly pricey (or at least for a backyard guy interested in only one car).

If nothing else this sure has generated some traffic! :D
 

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Seriously all you need to make a Ford OBD I scanner is a paper clip, A note pad and a pen. To reset the codes just run the KOEO Test and pull the paper clip out in the middle of the test without turning the key off, or unplug the fuse for the ECU or the battery cable. There is nothing you can use an scan tool for on OBD I Ford cars, except to read codes. Even the actual Ford OBD I "Scan Tool" only shows the code numbers on a digital display. The Ford OBD II scan tools are bad ass though. You give me an OBD II scan tool, and a wireing diagram and I can fix anything. OBD I take a bit more book work and troubleshooting.
 

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Pimp_scort_89_GT said:
There is nothing you can use an scan tool for on OBD I Ford cars, except to read codes. Even the actual Ford OBD I "Scan Tool" only shows the code numbers on a digital display.
I can't speak for the Ford OBD 1 scan tool, but if you've ever had a snap-on scan tool hooked up to your car, you can do a hell of a lot more than read codes and run self diagnostics. It will give you feed back on all sensor inputs, ie, what temperature your engine temp sensor is telling your ecu, intake air temp, egr operation, throttle plate angle (tps), and engine timing. Correct me if I'm wrong, but I believe you can set engine timing as well with one.

Matt 8)
 

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8O :?

I decided I wanted to be a mechanic, so once all my major bills (computer, glasses, dropped rate insurance) is done. I'm going to research different schools around the area. But, all this computer stuff is making me think twice about it. I just hope to be as good as Pimp seems to be one day so I don't get all messed up trying to troubleshoot some simple thing with one of these computers.
 

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Discussion Starter · #17 ·
fixitmattman said:
It will give you feed back on all sensor inputs, ie, what temperature your engine temp sensor is telling your ecu, intake air temp, egr operation, throttle plate angle (tps), and engine timing. Correct me if I'm wrong, but I believe you can set engine timing as well with one.

Matt 8)
That's what the software says it will do. I think it would be cool having the laptop on board and being able to do all this. But I am a geek. 8)

The biggest trick is knowing how it formats the data and finding out what the commands are to get it to cough up the information. I'm guessing that all that information isn't there on the diagnostic port, all the time.

We just have to find someone who's made an interface (level converter) and then find out the format and commands... :twisted:
 

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Discussion Starter · #19 ·
I found a bunch more stuff. LOTS more stuff. Seems the EEC-IV is pretty common and lots and lots of Fords have them. That's what I targeted my searchs on today.

Here's a whole list of interesting links (that have links on them, too.)
http://www.tweecer.com/test/downloads.htm [just okay] :?
http://acc-electronics.com/cloud/efi/amarch/eec.htm [mondo cool!] :D
http://www.cyber-fish.com/efi/fordeec.php [another mondo cool!] :D
click his "available here" link... He has a treasure chest of stuff.
of particular interest was the EEC mail as it has hundreds of emails
from guys trying this kind of stuff and more.
This schematic, http://www.cyber-fish.com/fordeec/dl-rs232.gif, interests me a great deal.

:twisted:
 
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