Every now and then I get a request for another PID. There are some things that are specific to BMW and harder to get via Torque, but there are also some that are easy. The attached document, SAE J1979, is for the universal OBDII PIDs. Torque does not recognize all of these in the normal PID selection menu. However, they often work as extended PIDS. With that document you can start to make your own custom PIDs. For example, fuel rail pressure is listed as PID 6D on Page 56, but does not show up automatically in Torque. The page is seen below, where I have circled the appropriate description
One thing you will notice is a single PID can contain lots of information and data. The rail pressure we are interested in is found in bytes D and E. Note the scaling column. Often times we want to change the units. In this case, convert to pressure in bar by multiplying the raw data by 1/10th.
So, to make this work in Torque, go to the extended PIDs menu and start a new PID:
Enter 016D for the mode and PID.
Enter ((D*256)+E)*0.1 for the formula, where 0.1 is the scaling factor.
Enjoy! ... and please share your findings.
