Chrysler Repair: P 1391, camshaft position sensor, crankshaft position sensor

Question
I'm from Romania and we have a problem with our Chrysler. the tester
told us it's about P 1391 problem. our Chrysler has the following
technical data:
Chrysler 300M, from 2000, V6 24 valves, 150KW.
WE CAN'T FIND THE SENSORS. CAN YOU PLEASE HELP US EXPLAINING WHERE CAN
WE FIND IT?
WE WOULD LIKE TO IDENTIFY THE CAUSE.

THANK YOU VERY MUCH IN ADVANCE!"

BOGDANA

Answer
Hi Bogdana,
The code says that one signal or the other (there are two signals) that come from an electronic camshaft and crankshaft sensors is disappearing momentarily at least 20 times in trip, during two consecutive trips. It suggests that either the sensor or its wiring or the engine part that the sensor observes is in some way faultly. It suggests that the wires to the sensor, or the part, or the sensor itself could be faulty and might be identified by visual inspection or testing with an electronic test device. The sensors are needed to time the sparking of the spark plugs and the injection of fuel.
In and of itself it is not of great concern until the signal it totally lost, in which case the engine will not run. So to me it would mean to be aware that this is happening and if the engine becomes notably losing its power or momentarily jerking that you need to find out which signal is missing and why because it may soon stop running.
I suspect one of the two sensors is beginning to fail. When it does so a code for which sensor will then be set and so the sensor would be replaced at that time. For now, the crankshaft position sensor is located at the seam which connects the engine to the transmission, on the right side of the engine/trans just above the differential housing. The camshaft position sensor is located on the timing case cover (front of engine). Both sensors have two wires in common: an orange wire with 8v applied to it, a black/light blue ground wire, and the third wires are tan/yellow (cam) and gray/black (crank) signal wires. If you put the key to the "run" position and turn the engine by hand using a wrench on the front pulley bolt you can observe the function of the sensors. It you put a fine pin through the signal and the ground wire insulation of each sensor and then attach a voltmeter you should observe the voltage to pulse between 5 volts and 0.3 volts several times per revolution. It would be more likely to misbehave (not pulse at all, or rarely) if the engine were fully warmed up when you did this test. You can also check the wire harnesses for each sensor to observe for damage or a loose plug.
Those are the best suggestions I can offer. Good luck!
Roland