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TPS and ECM, DTC P1151

Tiny
KNIGHTSCHARIOTS
  • MEMBER
  • 2001 FORD ESCAPE
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 304,000 MILES
This vehicle originally had a p0174 fixed that condition then dtc p0153 reared its head, so I changed bank 1 sensor 1 and bank 2 sensor 2 upstream sensors. I have an abslt TPS % of 18.4-19.2 at idle and I believe it should be zero at idle. So I'm thinking this TPS is toast or on it's way out.I also get high short term fuel trims at idle and when disengaging throttle while in motion I smoke tested and no vacuum leaks. My Chilton manual says it can be replaced without re-calibration. And will relearn after the battery was disconnected and some say it has to have a pro scan tool to get the voltage set from 0-5 volts set for the throttle plate open and close setting. I have an actron cp9690 scan tool. Could this TPS and the high fuel trims at idle and while disengaging throttle and the p1151 all be related? What's the procedure for changing the TPS on this vehicle listed above xlt?
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Sunday, September 20th, 2020 AT 5:07 AM

5 Replies

Tiny
4DRTOM
  • MECHANIC
  • 467 POSTS
Hello,

Yes, a bad or acting up TPS will through off your O2 sensors and the computers ability to get a good fuel mixture so first off you will need to remove the top engine cover to see the top of the motor and its right easy to get to the sensor and its connector.

Here are a couple diagrams showing you what to look for then:

1. Remove the Throttle Position (TP) sensor.
1 Disconnect the electrical connector.
2 Remove the screws.
3 Remove the sensor.

NOTE: Air cleaner outlet tube is removed for clarity.

INSTALLATION
1. To install, reverse the removal procedure.

After you've done this I would reset the computer by disconnecting both battery terminals and short them together for 30 seconds and this will clear everything in its memory. Then start it up go for a quick test drive and run a fresh scan to see what you have and whether or not the O2 sensors are still acting up.
Let me know what happens after that and we can see if anything else is going on.
Tom
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Sunday, September 20th, 2020 AT 7:22 PM
Tiny
KNIGHTSCHARIOTS
  • MEMBER
  • 19 POSTS
By connecting the negative and positive battery terminals is that going to erase and reset the just the cam or will it be removing power-train upgrades that are currently programmed into the computer?
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Monday, September 21st, 2020 AT 3:15 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,576 POSTS
It should only erase the learned items like shift points, idle speeds and such. The common things that the vehicle needs to relearn if the battery is disconnected, any of the updates that were flashed into the computer should be okay.
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Monday, September 21st, 2020 AT 4:05 PM
Tiny
KNIGHTSCHARIOTS
  • MEMBER
  • 19 POSTS
I have never changed a throttle position sensor on this vehicle listed above xlt model. I know this TPS has a confirmed bad spot from 19.2-20.8-%. And has a buzzing sound when at that part of the sensor engagement. My concern is not the physical changing of the sensor. My largest concern is how to set the new sensor voltage range from rest idle to wot and to make sure doing so I'm not going create a transmission shifting issue doing so or creating another issue. Does this does this specific vehicle need a pro scan tool to set it properly or can it be done with a automotive multimeter and back probing the sensor to set the voltage alone? Erroring on the side of caution I want to know what can go wrong in changing the sensor. Would rather be informed on the correct procedure and method of changing and setting it properly.
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Tuesday, September 22nd, 2020 AT 3:55 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,576 POSTS
That TPS isn't adjustable. You bolt it on and do the reset and it learns the new parts range as you drive it.
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Tuesday, September 22nd, 2020 AT 4:37 PM

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