Hi,

I'm trying to develop a steer-by-wire system for my Acura ILX 2017. My plan is to trick EPS so it thinks there is a torque applied by the driver. In order to do that I'm trying to figure out how the steering torque sensor works. I got a wiring diagram and a high-level description from Acura (below).



Looks simple and similar to the description for other cars I came across. However, I don't see voltage change between VS1-VPF. It's always 330mV and doesn't change no matter how hard I steer. The same for VS2-VPF: it always stays at 330mV. I measure the voltage at the input connector to the EPS module.

Can anyone give me a hint on how it works and why I don't see voltage change?

Thanks