Engine/Transmission (1994 - 1998) TPS problem solved...

[shendren]

NOTE:



(six shooter) - the signal wire is dedicated to the tps. the power wire is NOT on my 96. i had to round up a service manual today at a local dealer to verify.



so... ..... anyone with tps problems. t-tap into the power wire at the pcm and run a new one to the tps. cut the signal wire at the pcm and run a new one out to the tps. keep them out of the loom and run them in a new loom.



i used a 2 conductor shielded wire for running the new wires... .



i also added pig tails at the pcm and at the tps to check voltages while driving down the road.....



this solved my problem.





thanks to all for the help.....



scott

 

[shendren]

btw,



the pin connector numbers that howard durand calls out on the other thread are for his 94... ... NOT my 96... ... .



be careful and look at your service manual for connector numbers and such... ... .



scott.

 

[Dave Remillard]

Scott... Glad you got it solved . I'll double check the manual for my 95 to see what all the power wire is used on. I thought it was dedicated, but perhaps not. Just wondering if the color codes I posted in the previous matched yours. If not, It's obvious the Dodge engineers where up to it again. I assume also that your ground is still going directly to the body and not back to the PCM. Thanks for the update. Dave

 

[Howard Durand]

Just a note here to add to what Scott is saying.



On my 94 the 5 volt power wire to the TPS from the PCM is dedicated to that purpose only.

The one on Scott's 96 appears to feed the Engine Speed sensor and some other things as well.

On mine the Engine Speed sensor and Vehicle Speed sensor are both fed from a dedicated 8 volt supply by the PCM.



Interestingly, I have never had any problem with my TPS in almost 100 k miles.



If Scott's problem proves to be permanently solved by just replacing the power and signal wires to the TPS with a shielded pair, that would be an easier fix than pulling the wires out of the harness.



Scott, can you write a description of exactly what you did?

 

[shendren]

sure.



if you want the color codes to the TPS. just pull the plug and look at them. then verify with your service manual.



i'm a little gun shy about colors, pins, and dedicated wires understandably at this point... .



if your going on a trip, take your service manual with you..... would have saved howard and i some phone time.



first, verify whether the leads are dedicated or not.



on my 96 :



cut the signal wire at the tps and at the pcm. then hook up a new signal wire outside of the loom.



cut the power wire at the tps and TAP (not cut) at the pcm. replace with a new power wire.



done.



i added some pig tails for easy diagnosis at the pcm and at the tps.



you don't have to cut the ground wire. i did and then ran them to the engine for a better ground... ... .



thanks to howard and sixshooter for the help... ...

 

[Dave Remillard]

I just re-checked by manual and can confirm Howards 94 and my 95 are the same wiring from the PCM. The only wire that is shared and not dedicated is the sensor return (ground) that connects to pin #4. For those of you with 96 and newer are apparently different. As Scott stated, be sure to check your manual. Curiosity killed the cat, but why would DC engineers feel the need to change this? They seem to have tried to solve a known problem, but failed once again. Glad you worked it out Scott, just to bad you had to go to so much trouble to cure it.