Jeep Cherokee P0340 problems... replaced Crank and Cam position sensors?

B

Brad

New member
CEL came on, I had the codes read and it came up P0340 and P1391, I dont think they are related so I started by changing the Cam position sensor, had the CEL reset, two miles later it came back on, did the same thing with the Crank position sensor (I read it may throw the code for the cam) and again, came back on 2 miles later. Really wish somebody could help me out, im about $200 in the hole and hate spending more money without getting anywhere, and yes, I took contact cleaner to all the connections, traced back the wires to the PCM, cleaned the terminals there too, and its still throwing the same codes, nothing is visually broken or worn.
 
Visually check CMP sensor, CKP sensor, and Wheel speed sensor wiring for any chafing in wiring, breaks in wiring, or loose or corroded pins at wiring connectors.

Check the wheel speed sensor tone rings for breaks or cracks.

If the above are ok, the vehicle has to go on a labscope so that CMP and CKP sensors can be checked for intermittent failure. That is the only way to check thes parts when it is an intermittent failure.
 
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