Scr code/ ELD system

[Rawze]

things that come to mind as possible causes ...

maybe one or more of ...

* poor quality , or improper impedance wiring uesed for the j19239 twisted pair.

* Terminating resistor is turned on for the ELD and it should not be.

* Network wires are too long or someone has coiled the excess up into a circular loop (another no-no) instead of folding the excess it over onto itself.

* Poor quality j1939 controller inside the ELD. SOmething like a cheap-o MCP2515 was used in the device as the front end chip for the nertwork.. and it is not able to properly prevent signal collisions like a most sophiosticated chip can.. and its clobberig other netqwork traffic... in your case, one of the sensors.


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also, .. why would you get an SCR code?. Are you putting it on the network in the dash?.. or on the engine harness network?. -== seems a bit odd any ways. Just make sure its on the truck network and not the engine harness network.

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and if the truck is demandated.. make sure BOTH networks show 60-ohms with the truck shut off for about 5 minutes. Many deleted trucks, some complete idiot unplugs stuff down under the truck and it inadvertently disconnects the terminating resistor for the enigne J1939 network, as it is down at the DPF, etc.
-== engine harness network ends up at 120-ohms resistance (instead of 60 like it is supposed to be) .. and still functions.. but all kinds of ghosts and problems arise later on like not being able to calibrate a turbo.. or turbo intermittent controller issues.. or other ghosts like when you plug in something, something else stops working properly. etc.