I'm going to start with ToyOBD1 it's existence appears to be common knowledge in the community here and other Toyota communities but it appears to me that it has never been presented in a way that makes this accessible to all of you for approximately £20 worth of parts if you shop right and get creative.
I initially found out about ToyOBD2 approximately 2 years ago, I found a seriously old Russian github repo Hyperion11 that had documented it and I assume that is the main reason it is still not so easily accessible, along with the fact that his code syntax is always somehow broke and it never compiles until you go through it and fix it.
in the 10 minutes of tireless research I did before opening this new thread I found that the repo has in fact since been updated and he has in fact really improved it a lot except it obviously wont compile out of the box again because his syntax is broke

So once and for all let's get ToyOBD1 available to all of you I propose to do the following...
(1) fix the damned syntax of the latest build and get it to compile.DONE.
(2) update all the comments to English to make it easier for more people to understand the code if they want to go that deep. DONE.
(3) document instructions on how to program an Arduino with the code WIP
(4) demonstrate how to safely hook up your Arduino to your Diag port in your car's engine bay. NOT STARTED
References:
The code for this project can be found here https://github.com/Stanneh1/TOYOBD1
Random document about the toyota OBD 1 interface
http://wilbo666.pbworks.com/w/page/4965 ... yota%20OBD
And another random document about the OBD-1 Serial Interface (a bit more info here)
http://toyota.kgbconsulting.ca/wiki/OBD ... _Interface
Hyperion Toyota OBD 1 Arduino project.
https://github.com/hyperion11/toyota-obd-1
OBD I Diagnostic - CarTester 8000.
https://www.translatetheweb.com/?from=& ... yengine%2f
Arduino forum discussion regarding Toyota OBD1
https://forum.arduino.cc/t/reading-obd- ... 992/231151