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Code PO715

Tiny
DAVBART
  • MEMBER
  • 2013 FORD FUSION
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
Problem appeared with no pre-warning. "Clunks" when changing gears, loss of power, and very sluggish. No dash indications of failure. ODBII Code shows PO715. Where is the input turbine speed sensor located? Is it a relatively easy part to replace? Any directions will help.
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Sunday, December 6th, 2020 AT 7:15 AM

11 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I am attaching the testing that we need to run through in order to confirm this is the issue. There are many times that the sensor is replaced and it is not the correction so let's run through this testing and go from there.

However, I did attach the process on how to replace it if you would like to do this.

Thanks
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Sunday, December 6th, 2020 AT 11:33 AM
Tiny
DAVBART
  • MEMBER
  • 8 POSTS
Thank you for the tips. The TSS isn't easy to access, but once I get to it I'll run the diags.
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Sunday, December 6th, 2020 AT 4:20 PM
Tiny
KASEKENNY
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Understood. Yeah. These are not the most friendly things to do but let us know what questions you run into or how you make out. Thanks
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Monday, December 7th, 2020 AT 5:20 PM
Tiny
DAVBART
  • MEMBER
  • 8 POSTS
Just getting around to locating the TSS. There is so much crammed in small areas that it's not easily identifiable. Would you be able to point me in it's exact location? An arrow on these pics would help.
Any suggestions to thoroughly clean the entire engine?
Thanks
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Friday, December 11th, 2020 AT 5:00 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
It is hard to orient myself on those pictures but it looks like you got it on the first picture.

I am attaching the diagrams and what I am looking at as part of the case that will tell us where on the transmission we need to be. You can see the pattern on the case is the same where I am pointing with a red arrow. You should be able to get your hand up there and see if you can feel the connector. You may not be able to get it out but at least the connector is there where you know it should be.

Hopefully this helps. Thanks
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Saturday, December 12th, 2020 AT 8:27 AM
Tiny
DAVBART
  • MEMBER
  • 8 POSTS
Found it! I removed the black cardboard skid plate under the vehicle, and was able to access and disconnect the TSS sensor connector. No opens or shorts so far. What voltage may be present when checking K5? I need to test again.
If the TSS sensor needs replacing, it looks like the best way to get to it would by removing part of the air filter assembly and accessing that 10mm bugar from the top.
No rush, I'm retired. Thanks.
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Saturday, December 12th, 2020 AT 4:59 PM
Tiny
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Just to be sure, you mean K5 of the testing? If so, you should be on pin 3 and 1 of the TSS and it doesn't matter what it is supposed to be. It wants to know if it is above or below 4.8 volts. If it is above then the circuit is okay and you need a sensor. If it is below then you have a circuit issue somewhere, either wiring or the PCM has an open circuit on the board.
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Saturday, December 12th, 2020 AT 6:20 PM
Tiny
DAVBART
  • MEMBER
  • 8 POSTS
All testing pointed to the TSS. Nearly a week later, after receiving one online, I installed it without any glitches. Easiest access was to pull the Air Intake assembly which took around 15 minutes. I checked every wire and harness I could for breaks or loose connections. Everything looked 100%. Cleared the code. Ran the engine for 3-4 minutes, tested the shifting of gears while parked, and everything sounded good. I test ran the car and for the first 1/2 mile I was a happy camper - then, I felt the gears shift to Neutral then back to Drive, lost power and the "wrench" icon appeared on the dash. Barely making it home, I checked to codes again to find PO715. Odd thing was that now I got an "erase error" when erasing the code. Yet the code was not showing anymore. I also noticed during the test run that the manual gear shifting was not available.
Anyway the problem is still there, clunks when shifting gears, lack of power and lots of frustrations. I will pursue it further after a break.
Thank you for the help!
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Monday, December 28th, 2020 AT 10:01 PM
Tiny
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I suspect this is a wiring issue. The erase error I would not worry about. Sometimes the module will give a negative response but the code will still erase.

I would drive it again and get it to be an active code and then run through the testing again and I bet you will get some different results. Let us know what you run into with this and we can go from there. Thanks
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Tuesday, December 29th, 2020 AT 5:56 PM
Tiny
DAVBART
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  • 8 POSTS
The problem was a chewed wire going to the sensor that I obviously missed. It was in an area that couldn't be seen or accessed easily. Spliced it, and everything tested good. I am back in the saddle, and no more attitude from the old lady, for now.
Thanks for your feedback.
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Saturday, March 20th, 2021 AT 10:11 PM
Tiny
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That is great. You have to love those varmints that like the wiring. Can't blame them, the coatings have soy in them. Just enough for them to be tasty. I am not a fan of it but I guess it is an acquired taste for them.

Thanks again for using 2CarPros.
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Sunday, March 21st, 2021 AT 4:15 PM

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