Def Codes And Gauge On Empty
Hey guys have this truck that came in on the hook because a strap fell off the rollback bed got tangeld up in the driveshaft and ripped all electrical air and hydrualic lines out from under the truck after two months of waiting we got the proper wrirng harnesses hoes ect I didn't do the work in the begining I got called in to figure out the def codes I have checked all connections ohmed out all wires to the def tank sensor assembly chcked for voltage at the 4pin connector at the tank sensor and have on pin1 2.55 volts pin2 2.44 volts pin3 12.10 volts and pin4 is the ground according to what I can find these are the proper voltages for this system the ground ohms out to 0.3 the tank sensor assembly has been replaced and the results are the same have same codes as before so im starting to think that maybe we got a faulty in tank sensor if anyone knows something else to try let me know I dont know what else to check
Hi Barry, Disconnect the batteries and attach the positive and negative cables to each other away from the batteries for a few minutes to clear all KAM and it will reset the ECM programming. After that reconnect and test run and retest the system. I have had some success using this method in the past.
Tryed that this morning still have the same result like I said im leaning to the new sensor being bad out of the box everything I have checked is telling me that at least I hope it is sensor is $900 if im wrong.
Pin 1 and 2 are your data bus. With battery disconnected check for resistance between the two. You should have 60 ohms, if you do not you have a network issue. If that checks out and you have good power to pins 3 and 4 (check under load) than you may have a bad sensor.
Have 57.2 omhs across pins 1 and 2 I'm leaning more and more to the in tank sensor
Voltage on the CAN wiring is one thing but is the wave form correct? I have seen multiple DEF quality/level smart sensors corrupt the network. You may want to check that on a scope
Major quality AND availability issues with the quality sensors. So bad the EPA has issued an emergency waiver to take these out of the circuit thru programing. A Cummins authorized location has to do it. I believe no charge to the customer. Most eligible ESNs are listed on Quckserve, although as of a week ago ESNs were still being added. This waiver only applies if the sensor is unavailable…
Just a question has anyone gotten a new def tank sensor that was bad straight out of the box???
Yes. Freightliner, Daimler, and Detroit have all been problematic with bad parts straight from the box since the very beginning of supply issue days.
Yes I have seen them bad out of the box , that being said usually there is something else, like green network wiring
Well guys tryed the sensor to no avail everything that I have checked has told me that the in tank sensor was bad only thing I cant do is scope the data lines shop doesen't have a scope does anyone have any wiring diagrams on this truck for the def system I cant find anything on the web and freightliner is no help just to check pin location and other wiring to the def tank sensor and def pump…
Still working on the problem talking with freightliner about the wiring harness they sold us hope to figure out something soon thanks to all for the advice
To all who helped with this sorry it took so very long to post what freightliner told us ended up being the connector to the Def tank sensor was pined wrong swapped the pins and it worked fine so check all your connectors if you get a wiring harness from freightliner