A friend of mine has done a code disassembly of the 03 Grand Prix PCM for a 3800SC series III engine. He has evidence to suggest that the VE table (on the w-body PCM) is used only as a backup for fueling in case of MAF failure. He maintains that under normal operation, the fueling control is derived mainly from the MAF output signal and PE tables while the VE tables on these PCM's are not used unless a backup reference is needed in the case of MAF failure. My tests seem to indicate that this is so. Can anyone confirm this?