I have no problems querying the CANN BUS while sending and receiving data. When you say the ECM 'address' is 2024 I will assume that you are not talking about the boot loader but rather the first EPROM address. I am just a c/c++ developer so bare with me Line pressure is Little Endian, it is the exception. Transmission gear, pressure, and temp comes from the body control module at 0x000007E1. Way less of this proprietary OEM bull crap. Everything has it's own PID and they are an industry standard. But it does show the complexity of this bullshidt OBD crap. This at least works on an '07.5-'09 Cummins. It equals 0x2BA which converts to 698 decimal which is your RPM.which is the RPM my truck was idling at when I captured the data 0x15D4. Enter 15D4 into your scientific calculator and divide that by 8. In this case, it is Big Endian.so it would be 0x15D4. If those bytes are 0x15 and 0xD4, you combine them either Big Endian or Little Endian (tells you which byte to put first). For example, the RPM comes back on bytes 6 and 7. And I'm also not sure where you got your info about 'just request a 0C' and get back a two digit code. So I'm not sure what you mean by digit.but bytes are made up of bits. The programmer is doing all the requests, I just know where all the data is buried in all the packets. Basically all I'm doing it parsing out the data captured from the bus as it goes past my display to the programmer. I know exactly what my tuner is sending and what comes back.but I just can't make it respond to requests that I send. My problem is that I can't seem to get the timing down. That is the one paragraph response.so chew on that for a while and see if it gets you anywere. The RPM is located byte 6 and 7 from the PID 0x21 located in block 22. The messages to and from the ECM will be 8 bytes consisting of 8 bits each. Then you will request the blocks of data you want. You will need to put the ECM into 'diagnostic' mode by sending it a string of bits. Any response will be that address plus 8 so the responses come from 0x000007E8. It's not as easy as sending a two digit code. I have no idea if it applies to any other year model. This works on my 2009.I think 2007.5-2009 are the same. So, what I've managed to figure out with a little help from another person. So I would hook up a odbii scanner to get the raw CANN bus data and I would reqest '0C' which would then return me a two digit code that could then tell me the RPM by using the formula 256 firstdigit + seconddigit / 100 to get the rpms.Įssentially I am writing the scan tool of efi live but one that intergrates into my pc (yes I have a linux based pc in my truck) You view it with efi live but what I am looking for is the cummins specific pids down at the binary level (no efi live)

6.0 torque pro pids