Question2002 dodge grand caravan 3.3L V6, auto trans
My initial complaint was a hesition on cold driving. when the vehicle warmed up it drove ok.
vehicle trouble code was P0320 CKP sensor circuit, P0340 Camshaft position circuit, P1391 Loss of cam or crank signal. I replaced the cam shaft sensor and crank shaft sensor with parts from the dealership. after that i test drove the vehicle for about 1/2 hour and then the vehicle through a code. the code was P1391 loss of can or crankshaft signal. the engine shut down. when I started it after 5-10 mins. it started again. trouble code was 0340 Camshaft Position sensor circuit. I replaced another camshaft sensor. the same problem happens. I checked for corossion in the wires around the computers by pulling wires and checking for a bad ground connection.
Please could you respond A.S.A.P ..... could you please send wiring scematics with out put values for the cam and crank sensors ...
AnswerAt the crank sensor you have three wires. Brown with a pink is the 8 volt supply to the sensor. The next wire is the dark blue with a dark green tracer. It's spliced back in with the cam sensor, the a/c pressure sensor, intake air temperature sensor, clockspring and the throttle position sensor. Any of these components backfeeding voltage may cause abnormal cam and crank patterns. The third wire for the crank sensor is the signal wire. It is brown with a light blue wire and leads back to the PCM and also is spliced leading to the transmission control module.
The cam sensor again has three wires. Brown with a pink is the 8 volt supply, dark blue with a dark green tracer is the ground and Dark Blue with a gray is the signal wire.
Both sensors must have 8 volts to it while the vehicle is running. Both sensors work in a square wave pattern meaning the only way you will be able to detect a proper pattern is using a lab scope (osciliscope). The ground circuit should only go through the computer, do not try and substitute a direct path to ground or you may burn up the driver.
There is a service bulletin about installing a bracket near the transmission pan. This bracket properly routes the wiring harness in order to make sure it does not chaffed the trans case and rub through the harness. In addition to that the camshaft position sensor should have a spacer on the end of it to properly gap it away from the cam target. Failure to put this on will distort the signal and possibly even damage the sensor.
Because of copywrite infringements I don't beleieve I can actually copy and send you anything but if you run across them or subscribe to a support site like Chilton, Mitchell, Alldata then I can compare notes with you.
Let me know if this is sufficient, unclear or otherwise and I will get back with you.
Doug
