moonsetter Posted November 7, 2013 Share Posted November 7, 2013 Analog coolant gauge not working. Are there any repairs that can be done to fix this or do I have to send it to mack to get the gauge cluster changed out? Quote Link to comment Share on other sites More sharing options...
moonsetter Posted November 7, 2013 Author Share Posted November 7, 2013 I work in a shop and we have about 20 of these trucks and we've had to send several to the dealership to get worked on. Supposably you have to change out the entire cluster and get it reprogrammed to the truck for the truck won't start. This takes a lot of time and I was wondering if there is a quicker way that I can do it in my own shop Quote Link to comment Share on other sites More sharing options...
turckster Posted November 10, 2013 Share Posted November 10, 2013 If the gauge is part of the main cluster and is not operating then the cluster needs to be replaced. The new cluster needs to be programmed to the chassis. I wish there was an easier way, but, there is not. Before each cluster is programmed, we contact Mack so they can set up the software on the mainframe. Once the instrument cluster is programmed we have to program the odometer for correct mileage then program the date/time. All this is dealer only. Quote Link to comment Share on other sites More sharing options...
moonsetter Posted November 12, 2013 Author Share Posted November 12, 2013 Thanks truckster...I sure miss the pre computer days. 1 Quote Link to comment Share on other sites More sharing options...
moonsetter Posted December 2, 2013 Author Share Posted December 2, 2013 so now i have a new problem. Our mack trucks our starting to have a SCR derate mode, and showing a high Nox code. i clear all the codes then shut it off completely and then turn the key back on and it starts the derate all over again. seen a few other ppl say to just replace the filter and sensor and that should fix my problem. wanna get a little more feedback before i spend the money. also we are an oilfield company and these truck are going to a location that has spilled some kind of oxidizer all the ground. the trucks went on the location before the clean up. could this chemical have cause something to start missreading like a sensor? Quote Link to comment Share on other sites More sharing options...
farmer52 Posted December 2, 2013 Share Posted December 2, 2013 Sounds like a NOx sensor or filter issue. I would change the filter first (easiest and least expensive) and see if that helps. Do you have the correct DEF in the tank? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
staxx Posted December 2, 2013 Share Posted December 2, 2013 There is a book of issues that can cause nox sensor codes , if its still under warrenty take it to the dealership . The nox sensors are not easy to test or confirm defective or good. Quote Link to comment Share on other sites More sharing options...
moonsetter Posted December 3, 2013 Author Share Posted December 3, 2013 ok so an update... installed a new nox sensor and def filter. and we are using mack certified def fluid. still trhowing the nox and scr code. truck is going to the dealership. i hate it when i cant fix it or at least learn what caused it. but if i find out when it gets back ill post it on the forum. thanks for the info staxx and farmer. Quote Link to comment Share on other sites More sharing options...
staxx Posted December 3, 2013 Share Posted December 3, 2013 You should have 2 nox sensors , pre and post dpf filter. Really without dealership software you cannot fix emissions issues for the most part. Good luck. Quote Link to comment Share on other sites More sharing options...
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