× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: 6.4L Intake Throttle Actuator Smart Device Diag
Posted to Technical Discussion Forum on 12/4/2012

That same test light is used to produce a rpm signal on electric fan clutch circuit, to speed up diag and make sure the PCM can think in rpms ;) Login to read more.