A little help, please. Anyone ever run across a PCM that stopped outputting PWM fan control?
2005 LS2 (E40) suddenly stopped PWM (elec) fan control of aftermarket Spal brushless fan. Contacted Spal and confirmed it's not a bad fan by grounding white and powering yellow. PWM signal was being sent over white wire and never had yellow wire hooked up. While troubleshooting, loaded a discrete fan tune and was able to trigger fan wire to create a ground with scanner function... thought I might have knocked a wire loose. Any help is appreciated. Thanks