Diagnostic protocol

[pampyras]

Hello, can anybody tell me which protocol is used to communicate with ECU Bosch MP 3.2 via old PSA 30 pin connecter? Are there any detailed instruction datasheet? P.S: Waking up starts by sending 0x10 ant 5bps.
Thank you in advance

[mjb]

It's a PSA specific protocol, not covered by any cheap diagnostic tools.

[pampyras]

Yes, i know. I can connect with it with my Lexia. But i need to find the description about this protocol for study project. Anybody has any information about this? I think it may be some kind keyword protocol

[FarmerPug]

if you want to talk to it you need a pp2000.

[pampyras]

I have PP2000. I connect to ECU via Lexia and laptop. But i need description about protocol itself : baud rate, init sequency , adresses and etc. I want to make uC RPM reader. Now i know it maybe some Bosch protocol by table in this site http://www.invertix.co.uk/Peugeot.html.

[FarmerPug]

wow thats a level of computer use i think few of us are at, But i can say that the pp2000 software is what you use to talk to pugs, lexia is for citroens. The ebay seller i purchased my pp2000 was very knoledgeable in that respect, perhaps i could give you a link fro a pp2000 hes selling so you can ask.

[pampyras]

By the way Citroen and Peugeot uses the same protocol, so you can easy connect to your pug via Lexia, all you need to know is which peugeot car equals to citroen car (Xantia = 406, C5 = 607...)
I do not think that the seller would know such an information. Because the protocol is made more by software and the seller sells only the hw. Maybe cable manufacturer would know something.

Far now i have got some information in volvo forum, it seems that it is old protocol, that works at 9600 bps, and uses 0x55 sunchro byte and 0xAB 0x02 key bytes.

[mjb]

There is very little useful published information on the protocol and definitely not a nice specification document.

If you're really intent on doing it, you're best off using a protocol analyser to sniff the communication between lexia and car, and a USB analyser to sniff the communication with the Lexia. When I was looking into it I found a handy software USB sniffer for windows which basically sets up a fake device to proxy and log communication. It introduced "issues" with PP2000 though

I *THINK* 406s use multiple communication methods to talk to different ECUs - propriety/VAN/CAN for the engine ECU, and VAN for everything else, although there's multiple VAN networks so I'd guess that it might use different wires to tap into the different networks. I'm pretty sure the different VAN networks run at different speeds too, daft speeds like 61Kbps and 112Kbps instead of nice sane numbers like 64/128Kbps

Someone who was on here about a year ago was starting to look into VAN communication using a PIC to interface with the comfort bus on a D9, but his web site seems down. http://graham.auld.me.uk/projects/vanbus/index.html You may be able to find a cache somewhere if you're lucky