He is the guy I got my widget from.
Clever bloke, he said at the time he was working on the FOUT box/board.
J
P38A GEMS signal for ok to start.
- Thread starter marjon
- Start date
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He is the guy I got my widget from.
Clever bloke, he said at the time he was working on the FOUT box/board.
J
- Posts
- 4,568
- Location
- Near Heathrow.
According to his facebook page, he has closed down RPI now, but might respond on FB.
You edited your post.
Yes it’s what I have and is the same guy in your last video link.
J
Grrrrrr
Technician, Bodgit & Scarper Ltd
- Posts
- 19,955
- Location
- Buckinghamshire, UK. ('95 DT)
Its not the remote code thats the issue its the next step that comes out of the BECM to the ECU to say its ok to start.
I also belive that the ECU sends some sort of acceptance that it matches which then allows the BECM to allow cranking/fuel/spark.
Done a lot of reading and I may have misremembered some of that
Need to check if that signal from the BECM is sent when the fob is used to open or when the key is turned in the ignition.
There is an option to just put it in a working GEMs car and start it, then remove the ECU good to go standalone. Probably have to put the original in learn when replacing. But there is a distinct lack of RRs here.
J
Yes, I realise that but those 3 know the procedure all the way from capturing the code to sending a code to start the car.
iirc the Thor and diesel are similar in that there's a single code held in the BECM and the chip in the EMS. GEMS is different in that it uses a rolling code that is incremented each time. Marty once showed me how the codes were stored and sent. They weren't encrypted. I think it was simple hexadecimal but I don't know how it was transmitted. In the back of my mind I have the word K-line but my memory isn't reliable.
Grrrrrr
Technician, Bodgit & Scarper Ltd
- Posts
- 19,955
- Location
- Buckinghamshire, UK. ('95 DT)
K-line rings a bell.
Datatek
Well-Known Member
- Posts
- 46,135
- Location
- Near Poitiers SW France
Thankfully, I have never had anything to do with the V8 but I have always understood that the immobiliser for the V8 ECU's was a rolling code not a fixed code like the diesel is. The code is transmitted from the BECM on a serial line (K Line?) as four 8 bit bytes in hexadecimal format. Not difficult to emulate if it's a fixed code, not so easy if it's a rolling code as it is necessary to know the increments used for the code.
