Chrysler Repair: Camshaft/Crankshaft Codes, concorde lxi, crank sensor

Question
My '03 Concorde LXi 3.5L V6 (M) 45K has been a terrific car up until this fall.  Maintenance has been routinely done.  I replaced the battery early September.  October started check engine light & dying issues.  My longtime ASE mechanic said the code was either the cam or crank sensor.  I had him replace the cheaper one (sorry, but I forgot which, but it doesn't matter).  The check engine light was off for 2 weeks then went on again when the car died with the same code.  I had him replace the other sensor.  Good again for 2 weeks.  The car dies occassionally under different circumstances but starts up again.  He's had my car for days but can't find the issue.  He's checked the wiring harness & all connections, even put it on a "scope".  Now I just got a new code, P0016, along with the recurring P0344.  Recently, the engine is getting more difficult to start - nothing to do with the weather as it's garage kept.  Sometimes it runs for 2 seconds then dies. Eventually it starts up and drives fine.  It's driving me crazy, getting unreliable, & dangerous.  Do you have any ideas?  Thank you.

Answer
Hi Andy,
The 2 codes point more toward the cam shaft sensor than the crank sensor: although the 0016 says their signals are out of synch, the 0344 says the cam is intermittent by itself, so it leans toward a cam sensor problem. The manual lists the following remediations for the 0344:
wiring harness inspection
5 volt circuit open or shorted to ground (that is the supply to produce the 'effect' of the sensor)
pulse ring inspection (cam sprocket)
check crank signal
cam positon sensor bad
cam signal wire open
cam signal wire shorted to ground
cam signal wire shorted to 5v supply/or to 12v
bad pcm
The 0016 is similar but also says to look at the same possibilities for the crank

Both sensors share the 5v supply on violet/white from pin 29
and share a common signal ground wire on black/light blue from pin 27
The signal wires are on pin 34 and 35 (cam/crank respectively)

So there are 4 wires involved and one voltage supply...it should sort out. Or of course there could be an issue with the installation of the sensors. They come with paper tips that when pressed against the surface they sense and held there in place, the tips wear away and leave the proper spacing. Usually the sensors are going bad when they run for a while, then the engine dies, then it starts up again after some minutes to allow for them to cool down.

I don't have any other unusual tales about those codes. So factor in whatever seems relevant.
Roland
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