Hi all,

I'm playing with my mom's Fiat 500c, and for a project I'm currently trying to do I need to get the steering wheel angle. None of the message broadcast on the CAN bus through OBD-II seem to carry this information. I'm sure there is a PID for this information but I can't find it.

Has anybody encountered this ? Or can anybody with a dump of any fiat firmware check for me ?

I'm the "I will reverse engineer it" kind of guy but I'm not allowed to tear the car apart :/

PS: I also need the gearbox too, but bonus.

Thank you very much for any information you can provide that would help me (or the email of some tech guy at Fiat )

What are you using to look at the bus? What modules are you connecting to? What pins on the OBD socket are you connecting to?
Multiecuscan can read the sreering angle form the standard EOBD CAN connection (pins 6 and 14)

Robert G8RPI

I'm using a Raspberry with PiCan connected to the OBD-II port. I also don't really know which modules I am conected to (I have extended arbitration IDs, but not the mapping IDs -> ECUs).

So Multiecuscan knows how to do that ? This means it's possible, and I might be able to find the PID by reversing the code. That's a relief!

P1kachu said:

I might be able to find the PID by reversing the code. That's a relief!

Click to expand...

I was a bit too confident there...

Does anybody know a way to recover PIDs from this ? Or any other possibility (thanks for leading me on this g8rpi!)

P1kachu said:

I was a bit too confident there...

Does anybody know a way to recover PIDs from this ? Or any other possibility (thanks for leading me on this g8rpi!)

Click to expand...

Hi,
try this thread
https://www.fiatforum.com/grande-punto/442061-decoding-gp-07-delphi-ep-2-electric-steering.html

A Fiat Forum or Google search for "Delphi power steering PID Fiat" or codes will come up with lots of leads.

Robert G8RPi..

Yep, I saw this thread already. But I don't understand the format used by the EML327 (it says the code to access the steering system is 220948, but it doesn't look like a PID nor a CAN message data field [I tested it]).
So I'm a bit confused about how the request is converted from the ELM327 converts this data in a CAN message (I'm gonna ask him too).

I bought an ELM327 to try at home if I can port the whole project through this (AKA, if I can recover the same data + the steering wheel)

I have googled all around (in Italian, English and French), looked for all kinds of keywords, but the only really useful link is the one you pasted above. I think I need to get in touch with some tech guy from Fiat, but I am almost sure they won't be able to disclose this information to me

OKAY GOT IT !!!![...]!!!
I finally understood how to convert the EML output to CAN message:

Quoting the link G8RPi posted:

ATZ <---Reset All
ATSP0 <----Auto search mode
0100 <---Send test command
---//START CONFIG//-----
ATPP2CSV01
ATPP2CON
ATPP2DSV01
ATPP2DON
ATZ
ATE1
ATL0
ATH0
ATS0
ATSPB
ATCP18
ATCRA18DAF130 <-- 0x18DAF130
ATSHDA30F1 <-- 0x18DA30F1
ATAT1
ATST19
1003 <-- UDS critical diagnostic session (see [1])
2209480080 <-- Custom mode

Click to expand...

The messages to send are thus (using python-can):
0x18da30f1 02 10 03 00 00 00 00 00 // Initialize UDS session
0x18da30f1 03 22 09 48 00 00 00 00 // Fetch steering wheel

Thanks again for helping me !

[1]: https://en.wikipedia.org/wiki/Unified_Diagnostic_Services

Hi,
Glad you got it. Sorry I wasn't more help, I've been busy including a long drive so was away from my PC and data. (Cambridge to Edinburgh, 741 miles, 12 hours driving in the Croma. I did have an overnight stop).
The ELM 327 and it's replacements do a lot of the work.

Robert G8RPI.