How can I know if I'm doing everything right?

[tzomats]

Hi, I'm new to this topic and would like some clearer guidance. what I mean!
if there is any how to video or pictures how to make the connection between Teensy 3 and the MC33290, SN65HVDA100 and SN65HVDA195 and the plug of my car?
my car is fiat panda 2008.
I know I'm asking a lot but any help would be a lifesaver for me

[iwanders]

if there is any how to video or pictures how to make the connection between Teensy 3 and the MC33290, SN65HVDA100 and SN65HVDA195 and the plug of my car?

The usage section has a diagram on how to connect the SN65HVDA195 to your Teensy. Use the Teensy's TX pin 1, and RX pin 0, connect enable to pin 0 as per the reader example.

As for the plug of your car, wikipedia has a diagram on which pin is what. You should only need the K-line of ISO 9141-2 and the battery voltage. Be sure to wire it up like the diagram from the readme, with the resistor and diodes. At rest, the Kline should be at battery voltage.

After you're confident in your physical connections, read #3 for how to enable debug output, such that you get some more insight into what's happening. If you aren't 100% sure what handshake your car uses, also try readerKWP and readerKWPSlow.

[tzomats]

The usage section has a diagram on how to connect the SN65HVDA195 to your Teensy. Use the Teensy's TX pin 1, and RX pin 0, connect enable to pin 0 as per the reader example.

first of all thank you for answering me!
for me, who don't know it, I find it difficult to understand the circuit.
I will start the process if I need anything I hope to have the valuable help from you

[tzomats]

is poseble to work with arduino nano, that I have at the moment?

[iwanders]

for me, who don't know it, I find it difficult to understand the circuit.
I will start the process if I need anything I hope to have the valuable help from you

If you find this circuit difficult to understand, this project may be a bit outside of your skill level. In general things don't work 'out of the box', and debugging on both the electrical and software level may be necessary. I don't have a lot of time to talk you through that if things don't work. Not to discourage you, just setting expectations.

is poseble to work with arduino nano, that I have at the moment?

Probably, but you can't use a hardware serial port then. You MUST use softserial, as per the reader_softserial example.

[tzomats]

If you find this circuit difficult to understand, this project may be a bit outside of your skill level. In general things don't work 'out of the box',

don't worry about that, no one was born to know!
I also have a friend who can help me on the circuit!
thank you very much