CAN BUS - for DIY swappers, HELP! Engineers / shops welcome

[toddy101]

Gday guys,

I have just stumbled across this thread and believe I may be able to offer a solution.
I have recently got the Subaru FB20 and FA20 engines running stand alone outside of the car by emulating the canbus of all the other canbus computers (apart from the ECU and BCU units). I did this 6months ago for the EJ series engines and from this, developed the Subatronics Canbus Emulator.

The CANid's and data posted above match up with my findings for the FB20 and FA20turbo which is great.

From what I can gather in current conversions you are still using the FA20 ECU as well as the new engine ECU a the same time? I think we can get rid of the FA20 ECU entirely, and emulate the FA20 ecu using signals from the new engine, this would then make the rest of the car work like it did from the factory, but with the new engine, particularly the instrument cluster.

What I am thinking is having a little "black box", somewhere between the size of a matchbox to a box of playing cards. This box will sit on the CANbus network, and read the engine data from the GM ecu, it would then resend the data in the appropriate format back onto CANbus using the FA20 ECU format (0x140,0x141,0x144,0x360,0x361 etc).
I would also consider having hardwired inputs to allow non-canbus engines to be fitted, so accept a tacho signal, analog coolant etc.

I believe I can do this relatively easily, as I already know all the data from the FA20, have a program on a custom micro-controller and have a pcb board ready to go (although would probably make it smaller by removing a few components). The only issue is working out the CAN from the GM ECU. I have a few contacts with GM cars and have done some canbus logs (on Australian models), however could be different to USA GM, so ideally I would need someone to send me a US ECU so i can hook up and see the CAN it is outputting, also a pushbutton start computer as the WRX does not have this.

Let me know what you think. Feel free to msg me here, or my website with email contact details is http://agtengineering.com.au

Regards, Andrew.

[Floggin Tires]

So we start a small pool to fund the sending of a US ECU to this Man!
ComeOn?

[Lonewolf]

Originally Posted by Floggin Tires

So we start a small pool to fund the sending of a US ECU to this Man!
ComeOn?

I'd be willing to chip in a few bucks if this guy is legit...

[toddy101]

Getting a GM ECU and a few other bits sent to me. There is not much info on the GM side of things (they call it GMLAN High Speed), however a bit of reverse engineering and I am fairly confident we can get it happening.
Andrew.

[RMP]

I have been working on a DIY data logger for Autocross and track days. It is currently Arduino based, but I am planning to port it over to Beaglebone black. I am an embedded engineer and have access to a Canalyzer at work.

So far, I have decoded the following parameters:

Brake Pedal Position:
CAN ID: 0xD1
Offset: 3rd byte
Length: 1 byte

Accelerator Pedal Position:
CAN ID: 0x140
Offset: 2nd byte
Length: 1 byte

Steering Angle:
CAN ID: 0xd0
Offset: 0th byte
Length: 2 bytes

I will hook up the Canalyzer again when I have some free time and would like to decode more signals. Specifically RPM and speed (vehicle and all wheels). I did see traffic on the CAN bus that most likely corresponds to these parameters, but the difficult part is separating them and determining what conversion formulas to use.

I am currently using OBD2 PID's for the RPM and speed, but they are higher latency than just reading them off the CAN bus. At work now so have to keep this short, but will check in later.

[mabviper]

I'll share my findings as well.

Steering angle
0x00D0
2 bytes
1st - LSB
2nd - MSB
0x0000 Center. Left max 0xEE6B. Right max 0x1194.
Formula in degrees = reading / 10

Gear indicator
0x0361
1 byte
1st byte
Straight forward, 0x06 for 6th gear. Haven't figured out reverse yet since reverse is 0x01.

Speed
0x00D1
2 bytes
2nd byte MSB
1st byte LSB
Not sure about calculation yet.

Brake
0x00D1
1 byte
3rd byte
Should calibrated this for min and max cause I don't know if this is in psi, bar or percentage.

Wheel speeds
0x00D4
8 bytes
Same byte format as speed. Haven't isolated which is which though. I have a function but still have to verify it.


Throttle position
0x0140
1 byte
1st byte
0x00 - 0xFf = 0 to 100%




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[burdickjp]

That's some fantastic stuff.

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[Shit Luck]

Does anyone know if the crank signal is the same as 04-09 sti?
If it is I maybe found a solution to my swap roadblock.

[wutsaiu]

Originally Posted by Shit Luck

Does anyone know if the crank signal is the same as 04-09 sti?
If it is I maybe found a solution to my swap roadblock.

What exactly is your roadblock?

[Shit Luck]

Originally Posted by wutsaiu

What exactly is your roadblock?

Crank signal @toddy101 maybe you could help me out

[Shit Luck]

I got my answer...
Looks like it won't work. Subaru and Toyota really screwed this one up with the fa20.

[burdickjp]

Originally Posted by Shit Luck

I got my answer...
Looks like it won't work. Subaru and Toyota really screwed this one up with the fa20.

What exactly is the difference?

[Cuchullain]

Just thought I'd bump this thread and add a decent primer on CAN Bus operation:

http://hackaday.com/2013/10/21/can-h...introductions/

The four articles together have some information that most in this thread already know, but might be an interesting read for anyone not familiar with the subject.

[Subie_Nubie]

Subbed.

I literally write test programs to validate our spec'd parameters for various industrial and automotive CAN devices (offered from TI). I may not be as much help on the application side, but I'd help in any way I can related to technical information about the IC itself and functions thereof. Just let me know.