Thread: ELM 327 and Citroen c4

Originally Posted by bizkit1

Hello. I have a problem. I have a elm 327, i connect it to my c4 from 2006 and the soft says cannot connect unknown protocol. Can somebody tell me what to do?
Thank you!

Download STNTerm, then send the following commands:

ATZ
ATH1
ATSP00
0100
011C

Right click in the window, "save as" or "copy", and post here. Then, repeat with:

ATZ
ATH1
ATSP3
0100
011C

Best regards,

Vitaliy

Originally Posted by bizkit1

And what are those command for? What is the purpose of this program?

The program is a virus, its purpose is to steal your private information, post it to our servers in Somalia, and then set your PC on fire.

I'm kidding. The software is a terminal that lets you talk directly to the ELM327 and your car. The first set of commands sets the protocol to "Automatic", the second set sets it to "ISO9141". Then we send two OBD requests, which ask the vehicle which PIDs are supported, and what OBD system it has.

Vitaliy

Originally Posted by DigitalVampire

Does the same commands work for FIAT Grand Punto with 1.3 MJD diesel engine?

I get the same error as unknown protocol.

The same commands should work, but I doubt that your vehicle is EOBD compliant (unless it's MY2004+ car).

See this page for a more in-depth explanation:

How do I know whether my car is OBD-II compliant?

Best regards,

Vitaliy

I'm afraid that either your vehicles is not EOBD compliant, or the tool is defective.

Can you look at your diagnostic connector, and tell us which pins are populated?

Vitaliy