Blue Chip Diesel Blog

You've done the hotwire test. Your truck runs but you are still having problems. This could be an issue prior to the injection pump. It can be either the ECM or lack of rpm signal from the crank shaft position sensor in early truck and/or CAM shaft position sensor in all trucks. If these sensors function, there may be a problem with what is called the 'CCD bus.' This is a common information two-wire system that allows various components of the truck to monitor certain functio