Originally Posted by george y
My coach has a 275 hp ISB. While driving it will lose boost for up to 10 seconds then it kicks back in. It will set the check engine light with the 102 4 fm code. The code is a low voltage short to ground. I replaced the map and Iat sensors with no luck. Any advice on which wires I need to test would be appreciated. If it is a wire issue. Could it be something else?
I would replace the crank position sensor too, if it doesnít fix youíll have a spare. I had an intermittent cps that did the same thing but I donít think it was the same code as yours.