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Relearn throttle body

Tiny
GALANGFA
  • MEMBER
  • 2012 FORD FIESTA
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Hello all,

I have done clean the throttle body, and now I have problem with the idling. It can't stable. How I can fix this issue?

Thanks,
Galang
Wednesday, March 13th, 2019 AT 3:29 AM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi and thanks for using 2CarPros.

First, here is a link that shows exactly how to clean a throttle body. Take a look through it and confirm everything was done properly.

https://www.2carpros.com/articles/throttle-actuator-service

Next, if everything looks good, my first suspect is that you have by accident created a vacuum leak. Here is a link that shows how to find a leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Pay attention to vacuum hoses to confirm they aren't disconnected or torn. Also, reconfirm that the air intake tube to the throttle body is fully installed and not allowing unmetered air to enter the engine.

Let me know if this helps or if you have other questions.

Take care,
Joe
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Wednesday, March 13th, 2019 AT 9:23 PM
Tiny
GALANGFA
  • MEMBER
  • 10 POSTS
Hi Joe,

Thanks for your help.
I just tried to relearn the throttle body but the issue is still there.
Do I need to reset the ECU with Ford software? If yes, what is the scanner that has ability to do it?

Thanks,
Galang
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Wednesday, March 13th, 2019 AT 9:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Happy to help, but the only time a relearn is required is when the throttle body is replaced and requires no scanner. Here is what is done:

If the TB (Throttle Body) was replaced, turn the key "on" without cranking the engine for one minute to allow the PCM to learn the adaptive table values for the new TB (Throttle Body).

Let me know if that helps.

Take care,
Joe
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Wednesday, March 13th, 2019 AT 9:36 PM
Tiny
GALANGFA
  • MEMBER
  • 10 POSTS
I did not replace the TB, but what I did is I pushed the TB plate (butterfly valve) with my finger due to I want to clean the inside of throttle.
With what I did, do I need to calibrate the TB?
Advise please?
Thanks,
Galang
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Wednesday, March 13th, 2019 AT 9:56 PM
Tiny
GALANGFA
  • MEMBER
  • 10 POSTS
Hello there,

I just cameback from Ford service center to fix my car. They suspect it is the ECU was broken, but when we did scan there is no DTC detected.
Is it possible that the problem from the ECU software? We have tried to borrow the ECU, instrument panel and key from another car with same model and the problem solved.
Advise please?

Thanks for the help,
Galang
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Thursday, March 14th, 2019 AT 6:53 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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If that took care of the problem, it is most likely the ECU. They should be able to test yours.
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Thursday, March 14th, 2019 AT 5:31 PM
Tiny
GALANGFA
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What kind of test that we can do?

Thanks
Galang
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Thursday, March 14th, 2019 AT 6:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
If it is at a Ford Dealership, they should have test equipment to use which can determine if certain components are functioning or operating within the manufacturer's specs. They need to watch how the PCM (power-train control module) tries to adjust for the idle issue. However, you said parts were switched from a different vehicle and it worked. That really only leaves the PCM. (I believe you referred to it as an ECU so I called it the same in my last post, but it is a PCM).
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Thursday, March 14th, 2019 AT 7:32 PM
Tiny
GALANGFA
  • MEMBER
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Hi joe,
Sorry to comeback to you again,
If the PCM was broken, the check light should be on, right? And when scan the car, it will be detected by the scanner as fault, right?
Advise please

Thanks
Galang
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Friday, March 15th, 2019 AT 7:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Welcome back, and don't worry, you can come back as many times as you need.

In a perfect world, one would think it would turn the light on. However, the PCM may not even realize it is broken. That is the problem. There are different scenarios that can cause a false positive. In other words, something is wrong, but appears to be functioning normally and not recognized as a problem.
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Friday, March 15th, 2019 AT 7:32 PM
Tiny
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I see, thanks for the advise Joe.
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Friday, March 15th, 2019 AT 7:37 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Take care and if you can, I would really like to know how things work out for you.

Joe
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Friday, March 15th, 2019 AT 7:53 PM

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