I picked up a 1997 Ram with a 5.9 and 46RE. It looks like the PCM might be dead. I found Keenans Youtube video about opening a JTEC PCM and realized I was on the right track looking for a voltage protection diode. However, my PCM doesn't exibit such a failure.
When I turn the key on I'm getting voltage at the two 5v supplies (4.5 on one and 3.5 on the other) I don't get any response from a scan tool or the check engine light when doing a key self test.
No lamps from the PCM appear to work, and the ASD and FUEL pump relays aren't getting their ground.
I removed the PCM and supplied bench power, wired up a DLC between the PCM SCI TX/RX and a ELM327 scanner and am unable to get a connection.
I then wired a small bulb up to the MIL driver pin and get nothing.
I checked this pcb over pretty closely and can't see any signs of poor solder joints or broken traces.
Where should I go next? I feel like the simple, few skills needed, easy to diagnose failures are accounted for.
Hi, I have a ecm from a dodge ram 2500 cummins 2004 that doesn’t work (I think). The starter works, the engine turns but the engine does’t start. The garage told me that my ecm is not working. I opened it (I didn’t know we had to open the back side first to remove 8 screws inside before we open the front) and I damaged a bit the bord and I hope it will not be an issue (see the pictures) but I don’t know if I have the tipical problem dodge cummins has. I saw the youtube video of Keenan but I’m not sure about what I see.
What can I do so make sure I need to replace that part? Where can I buy that part? What is the name of that part?
First the elm device does not support(J2610 sci communication) find a tool that will talk to this computer. You need to open for visual inspection.After that you need a power supply that also has a current meter this will be your best friend repairing computers.Supply voltage I usually have mine set at 13-13.5 then make sure you are not drawing a mass amount of current if you are start feeling around all the components to see if you have one that is getting very hot this usually points at a shorted component.I use a thermal camera this works great for locating a shorted component.If you have more questions please post as many as you want thank you!!