Crate ECU CAN Massages

[KGTM]

Hi All,

I like to connect to my ECU directly and no using ODBII, does anyone knows the ECU CAN Bus messages?

Typical data sent my my eco loos like below, I know id ox==0x00000110 is throttle position but not sure what the data means , it has four bytes do that one I can do but not sure abut the other one.

ID bytes D0 D1 D2 D3 D4 D5 D6 D7
00000110 8007 00 00 00 00 08 2B 00 00
00000120 8003 03 20 61 00 00 00 00 00
00000300 8006 00 00 09 C1 5D 00 00 00
00000308 8008 00 00 3D 00 20 00 FF 00
00000348 8004 00 76 00 00 00 00 00 00
00000510 8008 10 38 3E 41 CC CB 00 28

Thanks,
Mostafa

[Ajzride]

Might want to go check out the RealDash forum. RealDash is an android based gauge program, and there is lots of discussion on pulling data out of ECUs over there. Just don't mention that you plan to make their software obsolete with your own product.

[KGTM]

I actually I use realdash for my display and know them well, but they do not read direct ECU code, they use OBDII as interface, but OBDII is ok for temporary connections but is not always good for permanent connection, So I just hope someone here has some connection to GM and get this ID and details of the CAN massage, really this should be published by the ECO manufacture, just to no know why is so difficult to find this info.

Thanks,
Mostafa

[KGTM]

Any one with any information on this?

[LCD Gauges]

Like mentioned, the CAN data for 3rd party ECU's and OEM ECU's is very difficult to come by. I've tried asking dealerships to get information, but they
won't release it.

Aside from a forum community that shares this data, I've only had success with "reverse engineering" the data stream. The problem with that is, the
data frame is not consistent even between model years of the same vehicle.

It's a very time consuming process as you're aware: base scan, log file. Scan, force a command, compare base scan with new scan. Then you have to
convert the HEX data in each element to decimal, and apply any offset and scalars. I did this for a 2006 G35, and found many data bits including warning lights,
door sensors, lights/high beam, etc.

This isn't available on OBDII which makes the ability to get CAN messages very appealing.

Here are some notes I took. Hope they can help you!
162577162576

[lewma]

I found this information about GMLAN

https://publicism.info/engineering/penetration/3.html

Just for reference I have my LS3 ECU communicating fine via CAN bus using a Aim Sports PDM32.

mark

[KGTM]

This really does not cover the ID and commands detail, I know all about the packet structure just not sure what ID mean what.

I can talk OBDII with ECU and get lots info that supports, which is not so bad, the issues is that one has to send command and get data back, possibly for something that is already on the bus.

This is crazy that for something that is designed for aftermarket cars the CAN bus information does no exits.

Well we will keep digging.

Thanks,
Mostafa