Eastcoastdiesel Posted July 12, 2014 Share Posted July 12, 2014 I have an 06 cxn613 giving me all injector codes.... Not an computer issue, replaced with another one off a same model truck. Nothings working. Helllpppp I am backed up to my eyeballs in work and this falls in my lapSent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/ Share on other sites More sharing options...
Macktech689 Posted July 12, 2014 Share Posted July 12, 2014 Depending on which unit pump fault is active the problem could be low fuel pressure. A faulty fuel pressure regulator or fuel supply pump will cause unit pump faults and white smoke and missfiring. Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/#findComment-252668 Share on other sites More sharing options...
Eastcoastdiesel Posted July 13, 2014 Author Share Posted July 13, 2014 All the unit pump codes are coming up (8-1 etc) should I try the pump? It primes but dosent start. Keeps turning over.Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/#findComment-252751 Share on other sites More sharing options...
Macktech689 Posted July 13, 2014 Share Posted July 13, 2014 Would be best to know what the failure mode of the faults is, unfortunately will need to use Mack diagnostic software to find that out. That will determine if the problem is electrical or mechanical. I wouldn't start replacing stuff until you know the failure mode Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/#findComment-252754 Share on other sites More sharing options...
mackmechanic15 Posted July 15, 2014 Share Posted July 15, 2014 Probally settiing injector codes with fmi 8. Basically most of the time just nuciance codes. First of all code is for the unit pumps on right side under the chrome shields. Called injectors in system. They are deigned to run in a certain frequency but as pump wears it goes out of range causing a code. We never worry about the code until the engine starts to have missfire when the light is on. Usually a slight missfire. Most of the time there is difference i the way it runs. Basically every aset engine has these codes logged. The older engines had programming to widen the paramters but yours should be the latest. I would just replace the pump one at a time until gone. When engine runni g and u feel it missi g a bit see what code is active by blinking code and replace that one. Drive again but unfortunately only way to fix is to replace pumps. Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/#findComment-253017 Share on other sites More sharing options...
wheeler73 Posted July 16, 2014 Share Posted July 16, 2014 Pin out test the harness from the eecu to the eup's and check the harness and eup's for shorts to ground and the harness for shorts to power and make sure the eup's are getting power. The eup's are controlled by the eecu supplying the ground to them. I have seen a lot of harness issues which can also take out the eecu. Quote Link to comment https://www.bigmacktrucks.com/topic/36332-i-feel-bad-for-asking-all-these-questions/#findComment-253060 Share on other sites More sharing options...
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