Voltage low is a short to ground or a shorted sensor. Voltage high would be an open circuit caused by a bad connection, broken wire or bad sensor.
If you ever have current faults (I don't know if cummins uses them). Current high or above normal is a short circuit and current low is an open circuit.
You can disconnect the sensor and see if the code changes. If it changes to voltage high with the sensor unplugged the sensor is bad. If the code doesn't change you have a wiring issue.
2002 6-speed, 5 inch exh, Aeroturbine 5050XL, Icebox, Edge Drag Comp, +100 hp injectors from Diesel Auto Power, Isspro pyrometer, mechanical boost guage & electric fuel pressure gauge. FASS 95, Valair kevlar/ceramic clutch, faded paint, cracked dash, lots of miles
Last edited by CoalRoller; 02-24-2012 at 11:54 PM.