c-mac Posted April 1, 2019 Share Posted April 1, 2019 I working on a 2012 chu613 with an mp8. Its equipped with the hydrocarbon dosing module and turbo bypass valve. The regen light was flashing 88% soot level. when attempting regeneration the dosing vale status is 0% and purging air, fuel pressure is 65+. I put a new dosing module on because I had one doing about the same thing and it took care of it. now for the weird stuff. while I was regening I noticed the battery voltage was 14-16.5 volts. I was thinking the system may be malfunctioning due to the high voltage. So if figured I would disconnect the alternator and try with just battery voltage. Got back in the cab and had no power to anything. no lights flashers or anything. while inspecting with my power probe I touched the ground side in the power outlet and it detected 12.5 volts. Just for kicks I hit the ground button on my probe while touching ground of the power outlet heard a relay click and everything powered up of a second or two. hit the ground again it powered up again and stayed on. Started the engine and tried to regen but still have the same problem with just purging air. Any ideas about whats going on? Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/ Share on other sites More sharing options...
Mackpro Posted April 1, 2019 Share Posted April 1, 2019 Did your T-1 temp every get hot enough to alolow the 7th injector yo start dosing fuel? Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-419560 Share on other sites More sharing options...
fjh Posted April 1, 2019 Share Posted April 1, 2019 In my opinion think you should be checking the block grounds Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-419564 Share on other sites More sharing options...
Dirtymilkman Posted April 1, 2019 Share Posted April 1, 2019 Check battery disconnect switch or other grounds. You'll always get power on a ground if it's searching for a good ground. Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-419568 Share on other sites More sharing options...
c-mac Posted April 2, 2019 Author Share Posted April 2, 2019 On 4/1/2019 at 11:57 AM, Mackpro said: Did your T-1 temp every get hot enough to alolow the 7th injector yo start dosing fuel? Got the ground problem fixed T1 at 275 or so 1 Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-419624 Share on other sites More sharing options...
Mackpro Posted April 10, 2019 Share Posted April 10, 2019 T1 need to be twice that before it will start dosing fuel Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-420323 Share on other sites More sharing options...
Lmackattack Posted April 10, 2019 Share Posted April 10, 2019 air and fuel.... mechanical injection and timing....thats all a diesel should need to run right !!!!! 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/56484-something-very-strange/#findComment-420367 Share on other sites More sharing options...
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