Code 0263 …stuck in ECM?
Hey everybody..its the mobile guy.
I don't post a lot on here for the simple reason that I spend more time reading and learning from all of your great posts that I simply run out of time. Thank you all for your contributions! I hope I can make a contribution here that may help some of you.
I was called to look at this truck for a check engine light with no drivability issues at all I hooked up my Insight which is the Cummins Factory scan tool and retrieved a code 0263 which is a fuel temperature sensor error code. I next went into the Cummins Online web site and did a search for this code. This code wasn't even listed! when you go on to the Cummins website you have to input the ESN number which is the engine serial number so I know I had the correct information entered. So I have a code thats active but cant access any service information on it. I don't know about you guys but without service information im about as useless as a one armed paper hanger. So I have this code that states the fuel temp sensor is reading incorrect but this truck after looking @component location in the service information system doesn't have this sensor even though I don't like to clear the code until the problem is fixed and incase I have to revert back to the freeze frame data I tried to do a code clear and the code will not erase. I also tried disconnecting the battery and holding the cables together thinking that the ECM was in a logic lock state but that didn't clear the code either. I was running out of time so I decided to do something that I normally don't like to do for many different reasons and that is to reflash the ECM with either an updated calibration file or the same calibration file. This truck did not have an ECM update available so I ended up reflashing the ECM with the same calibration file. After the reflash I was pleasantly surprised that the code was no longer in the ECM.I road tested the truck and put a few miles on it and the code did not return. I believe the problem with this vehicle is that something corrupted the calibration file whether it was a low battery voltage problem at one time or something else got into the logic part of the ECM. I forgot to mention earlier that there was not any data pid representing a fuel temperature sensor in my data list.
Sometimes you just have to go a little outside the box and try things that you normally wouldn't do fortunately it worked out for me this time and I was able to get the truck repaired and back to the customer. I hope this was helpful to some of you. If you like this kind of stuff I would be happy to put more up in the future. Thanks.
Good thought processes . Do you have any experience with Diesel Laptop ? I’m trying to get my manager to get something for bigger trucks
Hi James. I dont have any experience with that tool but get in contact with Michael Eilbracht..he has.
Thanks ! I’ll try and seek him out
Have a look at JPro. They make a pretty good aftermarket heavy truck software. If you work on anything with any frequency though, I would get the OEM software.
Yeah sometimes you just have to think outside the box. You have a code for a sensor that isn’t even on the engine. Then service information specific to the engine doesn’t list the code because it’s not supposed to be there with that engine. It has to be a programming issue, but how did the ECM set a code for a component it‘s not even supposed to have? Good find and fix. Sometimes programming is
Thanks Allan for the reply. Yes i was lucky on this one!
Thanks for the report. We find this in the Light Duty side as well. Most of the time it is due to someone installing a tuner or leaving artifacts in the memory when returning to stock. I have been exploring doing flashing for the HD market. Is it a worthwhile pursuit?
Hi Michael. If you do enough of them it is. Some are a pain to do but its doable. Sometimes it becomes a cost factor so its has its pros and cons.
Nice job Edwin. I have experienced similar issues. I have learned that if you recalibrate with insite through the 9 pin Deutch you will sometimes have issues with parameters being incorrect and causing ghost fault codes. That's why I always recall through the 3 pin deutch that goes directly to the Ecm. Plus I always save the parameters by making a template. That way if something goes wrong I