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TPS Help Needed Please

G

goosecockxj

NAXJA Forum User
Location
parker CO
Heres the problem, my 94 auto wont shift till what seems like redline. It did this once before but only for a day or two then went back to normal. we had the huge storm here in co and ever since it has started doing this again, i can get first through third but it wont shift till redline. The idle is also low at stoplights and sometimes will die. i have adjusted the TV cable and cleaned all the connectors. i did the "key trick" and the only code i got was battery was recently disconnceted which it was. I tried testing the TPS but only the connector with 4 wires going into it. That seems to be the one that would cause the tranny problems from what i understand. plugged or unplugged idle or WOT i get .8 volts from 2 of the wires and roughly 12 volts form the other two wires. i think i should be getting .5 from one of them at wot from what i understand. i have also checked the tranny fuse from the fusebox and thats fine. when i looked at buying a tps the pics are all of the connector with 3 wires not 4, does the 4 wire go by a different name? am i testing the right part? i printed out a sheet on testing tps's so im gonna try to test the 3 and 4 prong tonight but to be quite honest im not sure i would recognize a bad tps or know if i was ordering the right part to replace it (the 3 prong, when i think i need the 4) please help if you can cause if i dont fix it by the weekend its going to a mechanic and i hate doing that if its an easy fix
 
thanks that is probably the most helpfull thing so far. does anyone know what the 4 wire plug is? i read a post in here saying that that was the one i would need to worry about but that is never mentioned in tps articals other than the one on here. the picture of the tps through napa is the 3 wire setup just like the link shows. so do i even need to worry about the 4 wire setup? it dies at idle pretty often now so tps seems like a good bet, too bad i cant even get up to my house to work on it now, damn colorado, 2 more feet of snow on the way and let me tell ya these jerky shifts dont help on the icy streets
 
i recently had the same problem, after a steam cleaning of the engine.... did some research... found a couple similar symptoms 1) wont shift till redline, 2) recent contact with water... i just swaped out tps's with another 4.0l auto cherokee, and it proved itself to be a bad tps... its an easy replacement
 
Don't forget that the IAC's (idle air controller [connected to the TB]) 'tit' can become gunked-up, or break loose, causing all kinds of TPS-like symptoms...
$5USD at a scrapper... This caused a month of headaches for me.
 
A 94 TPS will only have the 3-wire connector and is the same part regardless of auto or manual tranny. The other writeups that mention a 4 wire plug are probably referring to the Renix setup. The TPS sensor for the older Renix setup had two sets of outputs and two connectors, with the flat 3-pin connector going to the engine computer and a 4-pin square connector going to the TCU. The TPS for the HO engines only has a single output and the ECU creates the second output for the TCU. Note that the TCU throttle signal runs backwards from what the engine computer needs (ie 5-0 volts versus swinging 0-5 volts).
 
goosecockxj said:
Heres the problem, my 94 auto wont shift till what seems like redline. It did this once before but only for a day or two then went back to normal. we had the huge storm here in co and ever since it has started doing this again, i can get first through third but it wont shift till redline. The idle is also low at stoplights and sometimes will die. i have adjusted the TV cable and cleaned all the connectors. i did the "key trick" and the only code i got was battery was recently disconnceted which it was. I tried testing the TPS but only the connector with 4 wires going into it. That seems to be the one that would cause the tranny problems from what i understand. plugged or unplugged idle or WOT i get .8 volts from 2 of the wires and roughly 12 volts form the other two wires. i think i should be getting .5 from one of them at wot from what i understand. i have also checked the tranny fuse from the fusebox and thats fine. when i looked at buying a tps the pics are all of the connector with 3 wires not 4, does the 4 wire go by a different name? am i testing the right part? i printed out a sheet on testing tps's so im gonna try to test the 3 and 4 prong tonight but to be quite honest im not sure i would recognize a bad tps or know if i was ordering the right part to replace it (the 3 prong, when i think i need the 4) please help if you can cause if i dont fix it by the weekend its going to a mechanic and i hate doing that if its an easy fix
Click to expand...

Can you post some pictures. How long have you had this Jeep? Could a prior owner have installed an older Renix engine, transmission and Renix ECU system (with the 3/4 wire two connector TPS)? Or could some one have installed the wrong TPS?
 
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