Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hi, can you tell me if your Ram's PCM has 3 or 4 connectors?
Ok, I'll get back to youwithin the hour. I'm at lunch.
Ok, C1 black pin 2 should be hot in run, pin 22 should be hot at all times, pins 31 and 32 should have a good ground. Check those and let me know what you have.
C3 gray, pin 30 is the pci bus. Ohm that to pin 2 of the data link. It's a light blue and purple wire. If that checks out good and all of your powers and grounds are good at the pcm, the pcm is bad if you can't communicate with it. Your data bus is nota can bus, just a single wire pci bus.
One question I missed that you asked about the ASD relay, that sends power to the injectors and ignition coils and a few other things, then the pcm grounds the other side of them to turn them off and on.
I can send you a diagram in the morning but I'm not sure what you're asking me right now. If the skim isn't recognizing the key as valid, yes it will start and stall after a few seconds. Considering you swapped modules around, you might need to run a pcm replaced function. There's a secret key code (not the skim) that has to be transferred between the pcm and skim when you run that function.
I would look in your scan tool for a pcm replaced function in the skim module and try to run that. If your scanner has that, let me know and I'll get you the skim code.
4403 is the skim code for that vin
No problem, let me know.
The ASD relay just supplies power to the fuel injectors and coils and a few other things. It has nothing to do with communication. If you can't communicate with the PCM, it has to be missing a power, ground, or the pci bus is open. With all those present and if you're sure the pcm is good, it has to communicate. I would go over those pins at the pcm again and ohm the pci bus from the data link again. If you can't communicate with it,it has to be one of those I just mentioned.
Ok. Let me know what you find.
I'll have to look this up tomorrow what it should be but measure the voltage on the pci bus pin at the pcm if you don't find any missing powers or grounds.
You're going to go into the WCM and run the PCM replaced function. Follow the directions on the screen and it should go through.
The WCM IS a module on the truck, that's the module you go into to program keys. I don't know if the OTC Scanner can get into it or not but if it can, the PCM replaced function should be under miscellaneous functions.