Idk if this is what you’re describing. I’m thinking it wouldn’t throw a code if it is.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?3290-24*-Knock-retard-no-knock-counts

Not 100% certain but do seem to recall the latter would accompany escm and the fault tree would make some sort of reference to it.

Not sure if this covers your year PCM...
https://www.2carpros.com/images/question_images/395315/original.jpg