2003-2004.5 pcm problem

[SBeauchamp]

has anyone had a no communication problem with pcm. working with shopkey/mitchal and a snap-on scanner. test given for this truck are not correct. tests for 03 match 02 wiring etc. it has a jtec powertrain control module any info will help. i replaced module,checked power and grounds and load tested all those wires. no loose or bad connectors. same problem. truck starting off in wrong gear but it dose up shift. any info on the pci bus would help also . thanks

 

[JLandry]

SBeauchamp,



How about please filling in your profile so we know what kind of truck you have?



In previous posts you had a problem with a 1998. 5 Dodge CTD, but now you're working on what year? How is this truck equipped?



And to clarify the problem, you have an auto equipped truck that's not dropping down into 1st gear on it's own when coming to a stop? What DTC's are you getting (if any)?



If this is a case of the transmission not automatically dropping down to 1st, it could be a range of problems. It could be:



1. Malfunctioning transmission output speed sensor (a less than $20 part located on the tail housing).



2. Mis-adjusted transmission Throttle Valve Cable (a. k. a: Kick Down Cable).



3. Faulty transmission Pressure Sensor Transducer.



4. Faulty Transmission Governor Solenoid.



5. Sticking 1st to 2nd shift valve or a sticking 2nd to 3rd shift valve (inside the valve body).



6. Front servo piston is cocked in its bore.



7. A rare voltage signal problem on the wire between the transmission Pressure Sensor Transducer and the PCM.



Best regards,



John L.

 

[SBeauchamp]

found the answer to my own ? . i needed a dbr 3 to read codes and data on this truck . snap on scanner would read everything but pcm data.

 

[JLandry]

found the answer to my own ? . i needed a dbr 3 to read codes and data on this truck . snap on scanner would read everything but pcm data.

This is not correct. You don't need a DRBIII scanner just to read and clear DTC's in either the ECM or PCM in these trucks. Any good code scanner will do.



There must have been something wrong with the Snap-On scanner you were attempting to use.



Good luck,



John L.

 

[TCDiesel]

This is not correct. You don't need a DRBIII scanner just to read and clear DTC's in either the ECM or PCM in these trucks. Any good code scanner will do.



There must have been something wrong with the Snap-On scanner you were attempting to use.



Good luck,



John L.

This is correct... also We have found many transmission problems related to poor connections C1 C2 C3. I mean really clean them up.