Quote:
Originally Posted by Dee8go
Do these home-made code readers act as just a display for information from the car's computer? I'm guessing that's the case since it doesn't sound as though they contain any sort of software of their own.
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The tool is nothing more than a .99cent LED that is Used to Initiate the cars Diagnostic Module, which then sends a code back to the LED in a Flash Format.
It is nothing more than an extension to the Built-IN LED/SW that some chassis have from the Factory as Stand Equipment.[ mostly Cal emmissions versions]
Which socket you hook the led to determines which Module in the cars Control Systems your are addressing.
This is OBD1, [ analog]..and does not work on ANY OBD2 cars...[ digital]
It is that simple...
Here is a diag. to make one ..or you can even go get one on ebay that a member here sells them at .. [ but for about $50..]
Make one ,,they are a nice tool box addition and they come in handy b/c you can also get to all the chassis code storing modules, ..along with finding the cause of many problems..saves that dreaded Dealer Trip we all like.
"Dealer Trip/Dentist/Trip"..both feared to the same degree, but the Dentist is usually cheaper $$$$$$$$$$$....
http://members.aol.com/ajdalton7/ledtool.jpg