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Hello everyone new to the site. I recently watched the video on the 94 dodge truck with the vehicle speed sensor wire rubbing the drive shaft. I have a 95 dodge Cummins and I've lost OD I have 1 2 3 gear but no TC lockup or OD. I'm not getting a 5v reference signal down to the sensor I've tested it at the pcm, inside the truck, and at the sensor only getting 2.59 volts. Any ideas? I've got about 100 hours looking for the problem so far no luck, have changed out soo many sensors yet the problem remains. Anything would be great Thanks!
Check for 5v at your other sensors first if you dont have 5v at them either yhen Unplug all your 5v reference sensors and see if you get 5v back if so start plugging them in 1 at a time until it drops to find your shorted sensor if you do have 5v at other sensor and not at speed sensor than well go another direction
I did what you said and unplugged all the sensors plugged in one at a time, still no difference. And Correct I don't have 5v on pin 47(white with orange wire) at the PCM or down by the plug at the VSS sensor on the tail shaft of the tranny. Went ahead and pulled all the harness apart. I have continuity from the 3 wires on the plug at the VSS to the PCM pins (4,7 & 47). I have continuity from the Plug on the tranny that goes to the OD solenoid inside the tranny all the way to the PCM pins (9 54, & 55). All the other sensors have 5 volts.
Ok now you need to check for short to ground on that 5v reference to speed sensor disconnect from ECM and speed sensor then check continuity from your 5v reference pin to ground alternatively you can remove that pin from the ECM and check voltage directly at ECM which is probably the best thing to do at this point that way wiring is 100% out of the picture and we'll only be looking at the ECM.
If you disconnect wire from ECM and still only show 3v there then the issue is on the ECM side but if you show 5v then we know it's a wire issue and running a new wire will be the easiest solution but we need to know if the ECM is putting out 5v on that circuit
What is this vehicle exactly I just looked up a 95 r3500 diesel and it shows that as a orange wire 8v shared between the crank sensor and the speed sensor
Also that shows pin 7 is your 8v and pin 47 is speed signal it looks like you may be looking for a problem you don't have . Pin 47 is spliced to the instrument cluster if you have correct speed there it's pretty safe to assume your ecm and wiring is OK and you have a different reasons for your transmission issues . Verify 8v on pin 7 solid orange wire
It is a 1995 dodge 2500 with the 47 RH. Ill have to try to check for short to ground tomorrow. I have an inconsistent reading on my speedo and don't have the correct voltage at the VSS (white with orange wire). According to the manual its supposed to read near 5v unplugged but it only has 2.59 volt. the solid orange wire has a constant 8v. I do have an OD switch how can I test it? only thing I can see to tell if its working is when you push it the light comes on push it again and it turn the light off. Is the kickdown cable the TV cable? if so how can you check that. sorry so many questions, I had this tranny and od rebuilt and have had a problem since. if I connect 2 switches I can manually switch the tranny into OD and TC lockup. That is the only reason im starting to think its electronic and not in the tranny.
So basically the problem started I was driving the truck after I fixed the KDP. when I installed the front timing cover gasket I pinched it on one of the bolts. I then had to install a new gasket after that it stopped shifting, I lost my ac and shifting. Replaced the ESS or most people call it the crank position sensor. I got a bad sensor had no tach reading so I replaced it again with another new ESS. fixed the ac but still no shifting. would hunt for OD sometimes so I replaced the TPS with a brand new TPS thinking that would fix it. still nothing so I bought the potentiometer (TPS DELETE) from DNR CUSTOMS. still no shift, thought maybe the tranny temp sensor was throwing it into limp mode I read about soldering a 1k ohm resistor into it, I did that still nothing. hooked it back up to the scanner and it showed the VSS was dropping out, I replaced the sensor and im still throwing code 15. that was the entire reason why im looking towards the VSS and the voltage not being correct. hope that helps a little.
Well this is interesting I had been looking on mitchell and they show code 15 as the vss but when I jumped to alldata they have it as the TCC solenoid circuit... do you have a DRB that can control the TCC solenoid? I can send you the flow chart but it would be hard to follow without being able to control the solenoid.
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