I obtained some readings using PCMSCAN for a 2007 Pontiac Wave(Codes P0171 & P0172). At idle SAE.VPWR recorded 14.229v, frame 3&4 was 57.825, frames 5-33(varied rpms) around 14.4,frame 34, 37 & 40 .049v with the rest again around 14.4v. My question would be: Is the alternator gone wacky?
I have the complete data in an Excel file if someone would like to be challenged with a solution for the Rich/Lean trim codes.
Thank you for your time and efforts.