I'm trying to log airflow in grams/cyl as calculated by the ecm for knock retard logging and timing adjustments. I tried logging APCYL_M and my V2 says it's an unsupported PID when I attempt to log data. I have V8 8.2.2 build 290 and OS #12663390.

Is there another PID I should be using instead? I am using a calculated PID referencing the MAF sensor in the interim, but I don't trust that as much as the value the ecm calculates when it determines spark advance.

Vehicle is a 2014 GMC Sierra 5.3L

Thanks in advance