CAN Bus Subaru Help

Ericschimel · September 29, 2020, 2:06pm

Hi all! I'm trying to do some CAN Bus sniffing with an Arduino and I'm running into some trouble...

Here's what I have for hardware for starters:

This OBD to Serial cable

This CAN Bus Shield:
https://robotdyn.com/can-bus-shield-for-arduino.html

And this UNO clone:

I'm trying to sniff the CAN on a 2016 Subaru through the OBD port. I am certain I can do it through this port because I already have a head unit that can read (and configure) the car's CAN functions through this port.

I followed this tutorial:
https://learn.sparkfun.com/tutorials/can-bus-shield-hookup-guide/all

And I used this basic demo to see if I could get unfiltered codes to dump out:

github.com

sparkfun/SparkFun_CAN-Bus_Arduino_Library/blob/master/examples/CAN_Read_Demo/CAN_Read_Demo.ino

/****************************************************************************
CAN Read Demo for the SparkFun CAN Bus Shield. 

Written by Stephen McCoy. 
Original tutorial available here: http://www.instructables.com/id/CAN-Bus-Sniffing-and-Broadcasting-with-Arduino
Used with permission 2016. License CC By SA. 

Distributed as-is; no warranty is given.
*************************************************************************/

#include <Canbus.h>
#include <defaults.h>
#include <global.h>
#include <mcp2515.h>
#include <mcp2515_defs.h>

//********************************Setup Loop*********************************//

void setup() {
  Serial.begin(9600); // For debug use

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(I made sure to use the library that belongs with this code too).

I was able to get an "INIT OK" out of this code, and despite fooling with the CAN speeds, and the read pin in the code I was never able to get any CAN data.

I also tried this library and demo code: (along with the associated libraries)

github.com

Seeed-Studio/Seeed_Arduino_CAN/blob/master/examples/receive_check/receive_check.ino

// demo: CAN-BUS Shield, receive data with check mode
// send data coming to fast, such as less than 10ms, you can use this way
// loovee, 2014-6-13
#include <SPI.h>

#define CAN_2515
// #define CAN_2518FD

// Set SPI CS Pin according to your hardware

#if defined(SEEED_WIO_TERMINAL) && defined(CAN_2518FD)
// For Wio Terminal w/ MCP2518FD RPi Hat：
// Channel 0 SPI_CS Pin: BCM 8
// Channel 1 SPI_CS Pin: BCM 7
// Interupt Pin: BCM25
const int SPI_CS_PIN  = BCM8;
const int CAN_INT_PIN = BCM25;
#else

// For Arduino MCP2515 Hat:

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I wasn't able to get a result out of this one either. Interestingly, just to rule out having the wrong pin defined I changed that number to pins 0-13 and I only got an "init OK" on pin 10, but never any CAN data.

As a last ditch effort I tried this code:
http://www.blackhurst.co.uk/RX8/readcanbus.txt

Which I saw being used in this video:

From the research I've done it looks like dumping out CAN codes is easy, and that precisely the thing I'm stumbling on... I feel like I'm missing something very obvious here, so if anyone could steer me in the right direction I'd very much appreciate it!

Robert_P · September 30, 2020, 8:29am

what CAN speed are you using/tried? on some newish cars you have to send request to PID and then you gonna get response on CAN

Ericschimel · September 30, 2020, 12:06pm

I tried 125k, 250k and 500k.

I had a thought about needing to send a command to start getting data but so far I can't find any information on what that command would be... It seems like very tutorial I look up it just starts working for people, with no mention of needing to send any kind of start command.

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CAN Bus Subaru Help

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