CAN communication errors MX-13 epa13

[Nerv]

Yes i have exactly 60 ohms between them. How do i test the power/ground wires?

[Nerv]

Im getting 12v at the connector with key on as well..

[Nerv]

So i have 60ohms between the CAN wires, i have 12.6 volts between the power and ground wires. Does this mean my issue is elsewhere in the circuit of the components that i have the CAN com errors for?

[Rawze]

(01-02-2025 )Nerv Wrote:  So i have 60ohms between the CAN wires, i have 12.6 volts between the power and ground wires. Does this mean my issue is elsewhere in the circuit of the components that i have the CAN com errors for?

maybe a bad actuator?

[Notch]

Maybe it's worth mentioning since it's a similar circuit setup, but I've run into a number of red engines that have thrown J1939 communication codes, namely VGT communication codes, stemming from the mechanical VGT veins in the turbo being seized up. What would happen is the ECM would command vein position and the actuator wouldn't be able to move them, which would cause the motor portion of the actuator to pull enough amperage that it would pull power away from the logic/communication part of the actuator, since the logic and motor parts share the same power and ground wires, and this would cause the logic part to momentarily turn off and back on while the key was on. This power cycle of the actuator would cause the ECM to throw J1939 communication VGT codes. I don't remember if there were any corresponding data codes, but it's a possibility if you're power cycling a CAN node that it could corrupt the data line long enough to store other DTC's.

Otherwise, without looking at any wiring diagrams or service info, I wonder if you could go through the other sensors/modules that are throwing DTC's and unplug them individually and then clear codes to see if one of them being unplugged would make all of the other codes go inactive. Thinking along the lines of them all being on the same power sources, grounds, or communication bus, an internally shorted sensor/module can pull down an entire circuit and that would help narrow it down.

[Nerv]

So i managed to finally clear the codes without them
Coming back instantly, this happened after resodering the broken ground and testing the ohms on connector. while they were cleared for a decent time they reappeared again, only with the service light no check engine this time, by the time truck had returned and i scanned it, the codes were all inactive, this time the same codes were on the scan including all these related specifically to the EGR and BPV(see image below) the BPV codes were all the same as the EGR ones. Any clue what I should look at next?

[tree98]

I would say you need a new EGR valve.