Bad TPS symptoms?
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Mountain Pass
Joined: May 2014
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Bad TPS symptoms?
Along with a high idle problem that's driving me a little bonkers on my 2002 3.0 V6 Escape, I've noticed that the tranny constantly hunts up and down a little when I'm running about 55-60 mph. Today I got a code P1120. Makes me wonder about the TPS... I replaced it during routine maintenance about a year ago with a unit from carquest, so I don't have the original to replace it with for troubleshooting. Will a TPS also cause a high idle, or are those 2 issues typically not related?
Dave
Dave
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Joined: Feb 2002
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From: Warren, MI
For sure that it's adjustable?? I thought adjusting a TPS for a certain voltage was from the old OBD-I days.
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Mountain Pass
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Yep, the mounting holes on the TPS are slotted on this one. I tried to match the original position, but it was a guess. I got a code last Friday that stated something like TPS outof range (P1120). I cleared it, and it hasn't come back, but it makes me wonder why.
I've also notice the tranny hunting around when in top gear at 55mph (up down shifting on almost no change in road grade), but if I speed up to say 70 it doesn't. Just wondering about this TPS code and if it needs to tell the ecu I'm pressing the pedal a little further than I am.
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Joined: Feb 2002
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From: Warren, MI
Hi Bill,
Yep, the mounting holes on the TPS are slotted on this one. I tried to match the original position, but it was a guess. I got a code last Friday that stated something like TPS outof range (P1120). I cleared it, and it hasn't come back, but it makes me wonder why.
I've also notice the tranny hunting around when in top gear at 55mph (up down shifting on almost no change in road grade), but if I speed up to say 70 it doesn't. Just wondering about this TPS code and if it needs to tell the ecu I'm pressing the pedal a little further than I am.
Yep, the mounting holes on the TPS are slotted on this one. I tried to match the original position, but it was a guess. I got a code last Friday that stated something like TPS outof range (P1120). I cleared it, and it hasn't come back, but it makes me wonder why.
I've also notice the tranny hunting around when in top gear at 55mph (up down shifting on almost no change in road grade), but if I speed up to say 70 it doesn't. Just wondering about this TPS code and if it needs to tell the ecu I'm pressing the pedal a little further than I am.
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Joined: Feb 2002
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From: Warren, MI
This Ford OEM TPS for your vehicle doesn't have elongated holes: https://www.rockauto.com/catalog/mor...030&cc=1385276
If they used the old type(non-Hall Effect) type, you can use a DMM to slowly operate it looking for drop outs, etc. Just watch out that the DMM's auto ranging features don't fool you as it jumps into a higher range!
If they used the old type(non-Hall Effect) type, you can use a DMM to slowly operate it looking for drop outs, etc. Just watch out that the DMM's auto ranging features don't fool you as it jumps into a higher range!
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Mountain Pass
Joined: May 2014
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This Ford OEM TPS for your vehicle doesn't have elongated holes: https://www.rockauto.com/catalog/mor...030&cc=1385276
If they used the old type(non-Hall Effect) type, you can use a DMM to slowly operate it looking for drop outs, etc. Just watch out that the DMM's auto ranging features don't fool you as it jumps into a higher range!
If they used the old type(non-Hall Effect) type, you can use a DMM to slowly operate it looking for drop outs, etc. Just watch out that the DMM's auto ranging features don't fool you as it jumps into a higher range!
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From: Warren, MI
I'll use my analog fluke to look for that. I'm about to replace the lower (and upper) manifold gaskets. Searching for the reason for the unpredictable high idle. I'm guessing that he transmission "hunting" at 55-ish mph may be an unstable vacuum signal, but I don't know how vacuum impacts top gear or torque converter lockup on this truck. The high idle/tranny issue seem to somehow be related...when the idle speed is nutty, tranny problem seems to have it's issue as well.
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From: suburban atlanta
I would not be surprised to see a bit of hunting in torque converter lockup if the TPS was faulty as the computer might see 'closed throttle' and disengage lockup. I am not to happy with the transmission hunting and kickdown occurring when traveling in slightly hilly areas. On a trip through OK on I-40(?), it was cruise, zoom, cruise, zoom as you went uphill and downhill. I wish the cruise would allow a bit more slowdown before deciding to floor the gas pedal.
tom
tom
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From: Warren, MI
I would not be surprised to see a bit of hunting in torque converter lockup if the TPS was faulty as the computer might see 'closed throttle' and disengage lockup. I am not to happy with the transmission hunting and kickdown occurring when traveling in slightly hilly areas. On a trip through OK on I-40(?), it was cruise, zoom, cruise, zoom as you went uphill and downhill. I wish the cruise would allow a bit more slowdown before deciding to floor the gas pedal.
tom
tom
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Mountain Pass
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Did a bunch of work on the truck yesterday, and checked the TPS for dropouts across it's range while cleaning the throttle body. It was OK, I probably caused the fault by plugging/unplugging the TPS connector. I didn't do it while running, but may have with the key on. Everything is good now, and I did a ECU reset to clear the fault. 150 miles of so and all is well. The TPS pot was 4750 ohms, end to end, by the way. Thanks for the help in how to test it!
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