GM.MAF and SAE.MAF

[Beer99C5]

Same or different?

I click the more information on the SAE.MAF and read what it says, but there is no information on the GM.MAF PID

So which is the best to pick for logging?

Beer

[Tordne]

I believe where possible it is better to log the SAE PIDs than the GM ones.

[SOMhaveit]

I don't see any SAE MAF PID.

[2002_z28_six_speed]

I don't see any SAE MAF PID.
Try unchecking your "SUPPORTED" box when looking through the PIDs. Sounds like the last vehicle you connected to didn't have that parameter.

[GMPX]

Off the top of my head I am not sure on those two, but normally if GM have a duplicate PID to an SAE defined one it means the SAE one was not accurate enough, eg an 8bit PID but GM needed a 16bit PID.

Cheers,
Ross

[2002_z28_six_speed]

Very interesting and thank you for that contributation!

Are you aware if the two PIDS would be based off the same calculation? What I mean is that the byte PID would be a manipulation [calculated from] of the word PID. That could be done very easily in C or ASM. I mean just look at the least sig byte of the GM PID....

Always looking to learn as much as I can about this stuff...