TST Comp and fuel system problem

[kdbvulcan]

Has anyone ever run in to any kind of trouble far as grounding goes,when you combine a TST box and a fuel system,it is confusing my AC,and my downloader is throwing some for AC code,is real important where you ground it at?what do yall recommend I try,also my TST box is not puttin out the power like it is suppossed too.

















03 dodge,TST,PPE downloader,DTT transmission,4 in exh,afe filter,airdog fuel system,sittin on 20's,3 pod gauges

 

[JStieger]

Has anyone ever run in to any kind of trouble far as grounding goes,when you combine a TST box and a fuel system,it is confusing my AC,and my downloader is throwing some for AC code,is real important where you ground it at?

Yes - ever since I installed my Walbro I get the AC code, the AC quitting, and the odd camshaft code. On the TST website in the FAQ's section they and others on this site recommend moving the TST ground to inside the cab onto the dash frame for example. I moved the ground a few days ago and erased the codes and they haven't come back since.



If you look at the wiring diagram, the MAP sensor signal and mass air flow sensor signal (5 volt) that both go to the camshaft sensor also go to the AC pressure transducer. The sensors ground into C1 of the ECM. From C1 they then go to a common ground G117, which is probably near where the TST and/or fuel system ground out at.



Here's some diagrams:



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