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SUVs Jeep Wrangler Jeep Wrangler 98 2.5 L Problem TPS
14 messages, Last post on Feb 18, 2009 at 5:05 AM
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Hi, the last year the engine just said, "DONE" and quit. I have replaced the TPS and after it was good.. This year, the same problem but only in winter.. My friend said "The TPS is sensitive to water intrusion." The Check engine is ON. The computer said the problem is the TPS.. in idle it have 3.24V and in full rpm 4.75V. My friend said "On my car it's around 0.40V at idle." What is the problem ? I don't think is the TPS maybe the thread or connector ? The TPS have a adjustment ? I am despair.. MY Jeep use a tremendous number of gas.. HELP ME PLEASE!! Sorry for my bad english. Thank you Dave
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Replying to: Suisse (Jan 03, 2009 9:39 pm) At WOT (Wide Open Throttle) it should be at 4.49v or lower, and at idle it should be above 0.26v but below 0.95v. The voltage should increase gradually and smoothly as the throttle is slowly opened. There's no adjustment possible, but you might want to remove your TPS and check the readings again while you make sure it has the full range of movement and isn't binding at all. A bad connection wouldn't cause the high reading you have at idle. However, just to be sure, maybe your friend will let you swap your TPS for his for the purpose of diagnosis? As long as your PCM is supplying the TPS with no more than five volts you can't damage his one. Oh by the way, your English, and obvious understanding of capitalization and punctuation, is more than good enough to have easily explained your problem. 
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Replying to: mac24 (Jan 04, 2009 10:20 am)  I have an other question. My father is electronics engineer. He said "I am absolutely sure that problem is the thread or connector because in cold the thread loses expension and the problem is the ground, because the voltage don't drop." It's possible ? He has one question for you.. Where it go the thread of TPS ? Where is the ground of TPS ? Thank you Dave and Frank
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Replying to: Suisse (Jan 04, 2009 12:27 pm) However, it has its own ground connection. Of the three connections one is a 5v supply from the PCM, the center connection is the signal back to the PCM, and the remaining one is the ground. The ground point that the wire from the TPS connects to should be good as several other sensors share it, and they all appear to be ok or you would have several other codes from the PCM. It's possible that the wire that connects the TPS to ground has developed a high resistance due to a partial fracture or corrosion, but that's easy to check with your multi-meter or you could just connect an additional temporary ground wire. While I could be wrong (when you're married you get used to hearing that), I still have a strong feeling that it's the TPS.
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Replying to: mac24 (Jan 05, 2009 10:58 am)  Thank you a lot for your time and your quick answer!! Thank you again Dave 
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Replying to: Suisse (Jan 06, 2009 4:44 pm)
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My Jeep is throwing 3 codes on personal hand held computer reader,:p0108,p1297,p0121. The problems started when I changed my water pump, I had to take it to my mechanic and have him realign my manifold gasket, he told me to change my distributor, so I did. I have 180,000+miles on my motor, I've changed my MAP sensor,TPS sensor, throttle body gasket and the elbow for my vacuum advance. It will run for about 100miles and then throw the check engine light, before it throws check engine it will start to sputter like a mis fire and then at 3,000rpm it cuts out on the throttle and it won't idle. The dealership wants me to have them diagnose it and they also think that my ECM might be bad. I have had it with my baby but I won't get rid of it, please help!
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Replying to: taz1973 (Feb 14, 2009 10:54 pm) The '97 shouldn't be giving 'P' codes, they should be simple two figure codes like 31 or 64. The '97 differs from later models in that it uses a version of OBDI which is unique to its model year; later vehicles use OBDII which does generate 'P' codes.
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Replying to: mac24 (Feb 15, 2009 7:12 am) |
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Replying to: taz1973 (Feb 14, 2009 10:54 pm) I guess I'm a bit lost on this one. 
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