Trouble codes P0340, P0622, P1388 - 2000 Jeep Cherokee

all codes are OBDll and are available online free, google them.
example P1684 Chrysler
copy and paste
https://mechanicbase.com/trouble-code/p1684/
https://www.autocodes.com/p1684_chrysler.html


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camshaft position sensor circuit malfunction---check the connection and wiring around and to the sensor the following link can assist you with the trouble shooting
http://www.obd-codes.com/p0340 P0340 Camshaft Position Sensor Circuit Malfunction http://www.myautorepairadvice.com/p0340.html

P1388 OBD-II Trouble Code references Variable Cam Timing Overretarded Bank 2, that is the most common definition for the P1388..

P1388 -Auto ShutDown (ASD) relay control circuit

P1388 Variable Cam Timing Overretarded (Bank #2)

Jaguar issued a Technical Service Bulletin related to this code ("Malfunction indicator lamp illuminated 3.0 l v6 false flagging of diagnostic trouble code P1383 or P1388"); reprogramming of the PCM should correct the problem

If your PCM already has been updated, then there is an issue with your variable valve timing system. It will need further diagnosis.

Hi there:


DTC P0622 - Generator Field Control Circuit
This is a trouble code relates to the charging system and means that the Powertrain Control Module is trying to control the generator field with no result during monitoring.


This problem could be caused:
- open/shorted within the field control circuit between the PCM and the alternator ( a brown/gray wire ),
- generator ground circuit (brown/black wire),
- generator itself, or
- faulty PCM.




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Hi there:


DTC P0622 - Generator Field Control Circuit
This is a trouble code relates to the charging system and means that the Powertrain Control Module is trying to control the generator field with no result during monitoring.


This problem could be caused:
- open/shorted within the field control circuit between the PCM and the alternator ( a brown/gray wire ),
- generator ground circuit (brown/black wire),
- generator itself, or
- faulty PCM.




Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

test and replace batterie and connections

1388 is the auto shutdown relay. I'd check that first as if there is no signal coming from there it can disrupt other functions. 622 is a problem problem with the alternator field. check the wiring on the alternator and make sure there is continuity between the alt field and the computer. 340 is the pickup coil in the distributor (cam sensor) I'd check that last as it may read that way due to the asd relay problem. Best manual to use for electrical is chiltons.