Question about 2005 Chrysler PT Cruiser
P0340 no cam sensor signal at pcm...car runs great till it reaches operating temp then it will set P0340 and if you give it too much throtle it will fall on its face simular to a dead or dying fuel pump...fuel pressure stays at 58 psi all wires ohm OK all back probes read ok...scan tool shows fuel injector pulse width drop to zero when engine falls on its face......HELP!!!
I think it sounds like your CAM sensor has fallen off or is faulty.
The computer controls the ignition timing and the injectors to squirt fuel in to the pistons at the right time. If the computer doesn't sense the cam angle correctly as you accellerate it can't put fuel into the pistons to match the opening and closing of the valves.
If you have a manual you can strip down the top of the engine to see the timing gears on the end of the Cam shaft and see if you can see the cam sensor and if there is anything obviously wrong (i.e. its missing) but you may be as well getting to the dealer to have it checked out and fixed. So the good Fuel pressure will not really effect the engine falling on its face as its a computer timing issue caused by bad sensor information that's causing the bad running.
Posted on Jul 31, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
Inspect the EIS towers and plug the wire connections for corrosion or other signs of poor retention at connections.
The electronic ignition (EI) module supplies a signal to the PCM whenever it determines that the #4 cylinder fired on its compression stroke. Because of opposite coil tower polarity, the simultaneous fir of #1 and #4 cylinders are of opposite polarity as well. Under most conditions, except decel, the waste spark cylinder fires before the compression cylinder in sequence. The EI module can determine this polarity sequence and voltage amplitude by using capacitive pickup plates located under the 1/4 coil. If the module senses a positive to negative sequence and high negative spike when #4 is on TDC, it pulls the PCM cam signal to ground signaling that #4 has just fired on compression. This signal along with the double pulse received from the CKP sensor, synchronizes spark and fuel timing.
Beside plugs , plug wires need to be replaced as well !
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