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VIS problem?

Tiny
VOLODYMYR
  • MEMBER
  • 2017 HYUNDAI ELANTRA
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 48,000 MILES
Hi all. I have an Elantra AD 1.6 automatic transmission. There is a question about the operation of the VIS valve - changing the length of the intake manifold. In theory, it should work at low and high speeds (up to 2000 and after 5000), and off at medium ones. According to the parameters that I found on the Internet, the voltage on it should be, when turned off, within 1.5 volts, and as a response, the mains voltage.
Those. As soon as the car starts, the valve should retract, but mine does not retract. I connected a multimeter to the chip, traveled, then there is a constant voltage of 10.8 volts + - both at low and at high speeds. And if you apply 12 volts directly to it, it retracts, i.E. Physically it works. But the signal is not correct.
What could be the reason?
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Friday, November 4th, 2022 AT 7:35 AM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,292 POSTS
VIS valve? I have looked in the engine wiring diagrams, and the intake manifold itself and cannot find what you are referring to? Check out the images below. Can you upload an image for the part you are talking about? Check out the images (below). Please get back to me.
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Friday, November 4th, 2022 AT 12:51 PM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
Yes, it's VIS valve! It doesn't move when the engine is running.
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Saturday, November 5th, 2022 AT 4:45 AM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
Video.
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Saturday, November 5th, 2022 AT 4:46 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,292 POSTS
Thanks for the video. Yep, it is not moving, Please remove the vacuum lines to see if one of them has vacuum, if so replace the valve.
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Saturday, November 5th, 2022 AT 1:07 PM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
There is a vacuum. Air is sucked in fine. I will say it again, if connect the VIS valve to the 12-volt battery, when the engine is running, the valve will operate.
Could this be related to the gas tank bleeder pcsv valve?
VIS and PCSV valves are connected to the same 10-amp fuse in the main relay. But this fuse is not damaged.
It's S2 fuse.
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Saturday, November 5th, 2022 AT 10:25 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,292 POSTS
They do not make this car in the states, so we don't have information on it. Diesel engine correct?
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Monday, November 7th, 2022 AT 11:17 AM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
No, it's a gasoline engine G4FG. But additional LPG equipment was installed. LPG System has separate connection to the battery.
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Monday, November 7th, 2022 AT 7:09 PM
Tiny
KEN L
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Check out the intake manifold image above there is no intake runner control. Which country is this car from?
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+1
Tuesday, November 8th, 2022 AT 10:09 AM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
What does mean no intake runner control?
What is it then? Auto in Ukraine, officially imported from Korea!
My engine 1.6 not turbo! It's common atmospheric.
https://youtu.be/owdBruNkjfM
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Wednesday, November 9th, 2022 AT 12:37 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Yep, this engine has the runner control, we do not have this engine in the states, we have a 1.8 and 2.0 liter, but there is no reason we can't fix it. What problem are you having? The valve may not move when the engine is cold or not under load. Do you have a check engine light on?
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Thursday, November 10th, 2022 AT 9:44 AM
Tiny
VOLODYMYR
  • MEMBER
  • 7 POSTS
No, there are no errors on the dashboard. And when reading the car with EML 327 there are no errors. I want to understand whether this valve is working or not correctly.
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Friday, November 11th, 2022 AT 1:50 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,292 POSTS
It sounds like it could be working okay do you notice any problems or what is the reason for the suspicion?
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Friday, November 11th, 2022 AT 1:57 PM

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