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TPS Problems?
Old 12-15-2003, 05:48 PM   #1 (permalink)
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Join Date: Feb 2003
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TPS Problems?
I know this has been posted a million times, but I still need more feedback on this subject. I own a 1995 Dodge 3/4 ton diesel 2wd automatic with approximately 124,000 miles. Lately, I have been noticing that when I drive down the highway at 60 mph the transmission will shift between 3rd and 4th gear constantly. The overdrive does not come unlocked. I have been reading the TDR about the TPS problems and I have never opened or cleaned my TPS. I didn't want to do that since that unit is sealed. I contacted a Cummings service shop and ordered a new TPS sensor. The mechanic that I talked to seemed to think that I was wasting my money, putting a bandaid on a problem, because he thought that the problem might be in the wiring. I checked the wiring, had 5 volts to my PCM and checked the signal and ground legs for shorts and found none. However, looking at my wiring diagram, I noticed that my water in fuel sensor is tied into pin 1 of the TPS. I do know that the water in fuel sensor has exposed wires. Could this cause a signal problem in my TPS that would create this problem? I have checked the fluid in the transmission, it is full but it is a little discolored. The transmission hasn't been serviced in over a year. The transmission shifts from 1st to 3rd beautifully, this condition only exists when I am at about 60mph. Any help you guys can give me would be great because I'm about ready to do the shendren fix. Thanks PW
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