OBD k line serial interface
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- Posts: 3
- Joined: Tue Jan 12, 2016 9:21 pm
OBD k line serial interface
Hi guys,
First post here so hello and thanks for providing a great forum!
I am after some advice on a home/auto project I am currently trying to get up and running.
I am trying to read the data transmitted from a plug in OBD tool which uploads certain commands/instructions to the vehicles ecu.
The onboard MCU is an STC11 series chip, data is sent via the K Line via the OBD socket.
What I want to do is read the data transmitted down the K Line, so I need what I think is a serial interface and some software to decipher it? My theory is that I can connect to the relevant pin on the tools OBD connector, supply 12v, then read the data stream? Question is what hardware & software do I need to do this? Bus pirate maybe?? Or a simple serial interface?
I'm trying to understand what the tools transmits with regards to code and how this will work on various vehicles, from there I want to understand and if it is possible to re programme the unit its self to carry out other functions/instructions to the ecu.
Sorry if this is a bit vague or if it is even possible in the first place, I will answer any question you may have, any help appreciated
Thanks again
frank
First post here so hello and thanks for providing a great forum!
I am after some advice on a home/auto project I am currently trying to get up and running.
I am trying to read the data transmitted from a plug in OBD tool which uploads certain commands/instructions to the vehicles ecu.
The onboard MCU is an STC11 series chip, data is sent via the K Line via the OBD socket.
What I want to do is read the data transmitted down the K Line, so I need what I think is a serial interface and some software to decipher it? My theory is that I can connect to the relevant pin on the tools OBD connector, supply 12v, then read the data stream? Question is what hardware & software do I need to do this? Bus pirate maybe?? Or a simple serial interface?
I'm trying to understand what the tools transmits with regards to code and how this will work on various vehicles, from there I want to understand and if it is possible to re programme the unit its self to carry out other functions/instructions to the ecu.
Sorry if this is a bit vague or if it is even possible in the first place, I will answer any question you may have, any help appreciated
Thanks again
frank
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- Posts: 432
- Joined: Mon May 20, 2013 2:45 pm
Re: OBD k line serial interface
I am not sure what the K line is.
If you search ECU remapping on eBay there is lots of software available, connectors for the laptop etc.
I have not used it but would be interested to find out how you get on.
Tar&stuff.
If you search ECU remapping on eBay there is lots of software available, connectors for the laptop etc.
I have not used it but would be interested to find out how you get on.
Tar&stuff.
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- Posts: 3
- Joined: Tue Jan 12, 2016 9:21 pm
Re: OBD k line serial interface
k line is the data channel used, which I think is serial possibly?
Re: OBD k line serial interface
Even if it is serial, unless you know the protocol and how to decipher it then you'll just end up with a hell of a lot of 0s and 1s!
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- Posts: 3
- Joined: Tue Jan 12, 2016 9:21 pm
Re: OBD k line serial interface
The protocol is j1850