Hello again. Been a while. So all winter it has been fine. Well, poor gas mileage still but not dying on me. Last week it threw a new code and the tach died. P0340. Sunday I took the cam sensor out and found it to be cracked on the bottom. Replaced it with a new ac one and no code and tach works again. I'm going to assume that this sensor going bad could have been the cause of my problem?

 

Posting the freeze frame data for the P0340 might be helpful.


P0340 was most likely set by the camshaft position sensor, (CMP) in the distributor, however: The PCM uses data from the CMP for detecting and identifying cylinder misfire. If you disconnect the CMP, it will set a DTC such as P0340, and cylinder misfire will not be detected, but the engine will start and run fine. Engine RPM is calculated by the PCM using data from the crankshaft position sensor, (CKP). The PCM sends RPM data to the logic module in the instrument cluster, and the module sends it to the tachometer.


The puzzling part here, is those two sensors, (CMP & CKP) are supplied voltage through different fuses. If either circuit were to fail completely, (fuse blows, broken wire, etc) there would be other symptoms and possibly, but not necessarily, other DTC's set in memory. Bottom line: Due to the complexity of the circuitry, I would suggest "watchful waiting", in other words, wait and see what happens Monitoring CMP & CKP as suggested in post #10, might be helpful, but only if the Autoenginuity is connected when it acts up.