Juice Posted January 12, 2012 Share Posted January 12, 2012 hello guys hope some one can help? let me start buy saying i have been a mechanic for over 20 years and i need some help on this one. i have a 2001 rd 688s in the shop at about 800 rpm the malfunction lite comes on and the truck go's in derate mode i plug the computer in and it tells me the engine position sensor is bad change sensor same thing. I put it back on computer still saying bad position sensor so this time i changed the harnes for the sensor still no go. Also some times this truck will run for 2 or 3 days know problems. Any help would be great im not one to keep throwing parts at it thanks agin. Quote Link to comment https://www.bigmacktrucks.com/topic/22635-2001-rd-688s-malfuncition-light-no-power/ Share on other sites More sharing options...
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