Most probably, the first signal is the requested RPM and the signal protection is for that RPM field. 0 probably means no request.

Hey all, first time poster, long time lurker. I am working on a project shown here: https://ls1tech.com/forums/automatic-transmission/1978947-my-10l80-10l90-10r80-stand-alone-transmission-controller.html I am working on a 07 Escalade with L92 and e38 ecm. I am trying to decode $199 (TCM -> Engine T...

I'm working on decoding the T43 TCM <-> E39 ECM torque messages. I am also looking to learn more about TCM<>ECM integration on the same E39 test mule actually. I am trying to actually replace E39 with my own ECU, what's your project? Nice to see you on here. I am doing the opposite thing: I am tryi...

Some progress on $189 and $199. There are 4 separate torque signals spread across the two frames. Also, only the 2nd torque signal of each frame is protected by a twos-complement of the sum of the signal and rolling count. I did verify the protection value agrees with the spec in GMW8772-1. The prot...

$19D I think it's this??? BO_ 413 TransmissionInputSpeed: 8 TCM SG_ MessageHeartBeat : 6 |2@0+ (1,0) [0| 255 ] "" XXX SG_ TurbineAngularVelocity : 48 | 16 @0+ (0.25,0) [0|65535] "" XXX SG_ GearRatio : 56|8@1+ ( 0.03125 ,0) [0|255] "" XXX I don't think the "GearRat...

I'm working on decoding the T43 TCM <-> E39 ECM torque messages. Here is where I'm at with $189. I'm trying to RE this using CAN logs from my 2014 Impala with the LFX and 6T70. Next I would like to start looking at the T43 disassembly to better understand the unknown signals. BO_ 393 unknownTCM_Torq...