Reading data from car's ECU ABS wheel speed sensors

Question

I'm currently working on a project that requires gathering data from a car's wheel speed sensors(4 hall efect speed sensors). Those sensors are connected to the car's ECU responsible for ABS/ESP/Stability control etc.

In order to extract the data from the ECU i need to make a request with a specific PID(parameter ID) AND know how to decode/compute the answer in order to extract any meaningful data. Unfortunately vehicle manufacturers don't seem to make such information public. So far i've ordered an arduino CAN BUS shield and a OBD2 to RS232 cable in order to make the physical connection. I have tried using a specialized hardware/software(that costs more than 1500euro) capable of extracting those parameters, but unfortunately it lacks logging functions. I tried using Wireshark to sniff the PIDs called, but had no luck there either. If you guys have any ideas, questions or suggestions, please write them down. I'm open to criticism and know that i might be missing something important. Thanks. P.S. This is a university project im working on. I need data samples from the wheel speed sensors and further computing of the data sample is done with the purpose of researching car safety and behavior in dynamic road scenarios.

Answer 1

You can only read the OBD data from the OBD-port. The OBD PIDs are generalized in ISO/CD 15765-5. You probably find non reliable descriptions also in Wikipedia. But in order to get the other PIDs, firstly you should know that those data are heavily under control by the car manufacturers and you have to hack them. One way to find them (but very unlikely to find one!) is the try and error method.

You should access the main CAN-BUS wires and the buy a connector device so you can sniff the packets. then monitor all the packets and make a small change. Monitor it again and compare these two. Maybe maybe maybe you have a chance to find some non-safety features with this method but finding security functionalities like ABS is heavily in doubt.

UNLESS you are some sort of genius hacker who can do weird stuff! If you can do it, then call the manufacturer and show them what you have so you would likely get a nice job and salary by them!

ONCE I saw a youtube clip that a guy could control a TOYOTA (if I remember correctly) with a laptop! and also maybe you can buy such info on the dark web which I advise highly against it!