Bus signaled Engine Warning Light and Oil pressure gauge Reads Zero. Hooked up to diagnostics "live run" and there are No engine parameters listed. No Oil Pressure, No Turbo Boost, No MAP..Does show RPM & throttle position....Bus runs OK...anyone seen this before ??
I had one a couple years ago that would read no OP when traveling down road and spike over 100 psi when stopped.... ended up being a bad Inlet Throttle valve was problem... the Oil pressure, Map sensor, Fuel pressure, Exh back pressure, and Inlet Throttle valve all use same 5v reference voltage and ITV was causing oil pressure to have to much voltage put to it for ref volts....caused OP gauge in bus to go nuts!! check reference volts at OP sender and then unplug one at a time to see if you have one of those sensors shorting out causing issue.... could be just a bad OP sensor causing the other issues too.... Get your Fluke meter out and have some fun!!
2009 IC w MAXXforce DT
Posted - 12/07/2015 : 2:11:02 PM
