Heavy Equipment Repair Questions? Ask an Expert Now.
Hi my name isXXXXX will try to help. When you replaced the VSS sensor into the transmission did you turn until stop and back it out 1/2 to 3/4 turn then lock the nut? also take a close look at the harness and connectors for .any broken, loose, corroded and damage wiring dont be afraid to pull on the wiring to see if any of the wires may have gotten broke inside the insulation or tugged on something during the engine swap Reply back and let me know
Hi Dan,thanks for fast response,did all of that many times,am convinced problem is the year difference in engine,as there are several electrical plugs not used on the non egr engine ,around old v pod location especially.Do you happen to know which pins on ecm are for vss,and do the 2 wires from vss go directly tp ecm Thanks Tom
Hello and welcome to just answer.i can help you with this..
there you are ,the vss wires go into the plug towards the rear and the bottom.
yes what I mean is do they go directly to ecm or somewhere else.As I mentioned I have a t2 trans and when I ran 2 new wires from vss to ecm pin e2 and e3 I believe,trans wouldn't shift. thanks Tom
no longer have old ecm,hooked 2 new wires from vss to ecm still no signal,and it put trans in some mode where I only had 2 gears.as I said it has a t2 trans,and the vss definitely has some effect on it
Hi Tom and welcome to JA. I am Buddy, and i will try and help you out. On the lightning T2 transmission. The vss sensor wiring goes to the transmission ecm. From there it goes to the engine ecm via data link.
What i am almost certain going on with your vss problem is your engine ecm parameters are wrong in that ecm. You will have to carry the engine ecm or truck somewhere that has program capabilities and program it for a FRLO-15410C-T2 transmission and set the inputs and outputs for it in the ecm. If you still had old ecm, this would be pretty easy to do. Without the old one, it takes a little bit to get all the parameters set correctly. I am sure the ecm in it now is set for manual trans and the inputs and outputs would be all wrong.
I see problems like this quiet often because the engine ecm is not programmed correctly. I hope this helps you out
Here is also a link to the transmission manual. On page 123 shows a diagram of the wiring for the vss
http:[email protected][email protected][email protected]
Thanks Buddy,I think you nailed it.What a frustrating couple of days.Thanks again,Tom