I have been asked about my logging of multiple CAN buses, up to 4 simultaneously.
Here, I will attempt to describe what we have done to facilitate our exploration and
further our understanding of the data that we find on the CAN buses of various EVs.
There are many OBD2 analyzers that plug into the OBD port on "smog-producing" cars.
The no-emission EVs are not required to conform to the OBD2 specifications, so most
manufacturers of BEVs have invented their own proprietary CAN messages and data.
We started with the Nissan LEAF almost 5 years ago, shortly after some of us got our LEAFs.
Using meters and oscilloscopes, we found 3 CAN buses on the LEAF's OBD connector,
and another hidden CAN bus. On the Rav4EV there are at least two CAN buses, one
"hidden" in the back of the car. In the Tesla, we know of 4 on the "hidden" TDC, probably
two on the OBD connector, and at least one elsewhere. So, the question remains, what
can we learn, just by listening, recording (logging), and examining the data that we log.
A few details to cover in future posts:
1. Hardware, for logging 1, 2, 3, or 4 CAN buses.
2. Firmware for the above hardware.
3. PC Software for Logging, and investigating the Logs.
4. Investigation techniques.
More later, with pictures, and links to sources.
Cheers, Gary
Here, I will attempt to describe what we have done to facilitate our exploration and
further our understanding of the data that we find on the CAN buses of various EVs.
There are many OBD2 analyzers that plug into the OBD port on "smog-producing" cars.
The no-emission EVs are not required to conform to the OBD2 specifications, so most
manufacturers of BEVs have invented their own proprietary CAN messages and data.
We started with the Nissan LEAF almost 5 years ago, shortly after some of us got our LEAFs.
Using meters and oscilloscopes, we found 3 CAN buses on the LEAF's OBD connector,
and another hidden CAN bus. On the Rav4EV there are at least two CAN buses, one
"hidden" in the back of the car. In the Tesla, we know of 4 on the "hidden" TDC, probably
two on the OBD connector, and at least one elsewhere. So, the question remains, what
can we learn, just by listening, recording (logging), and examining the data that we log.
A few details to cover in future posts:
1. Hardware, for logging 1, 2, 3, or 4 CAN buses.
2. Firmware for the above hardware.
3. PC Software for Logging, and investigating the Logs.
4. Investigation techniques.
More later, with pictures, and links to sources.
Cheers, Gary