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2017 Elantra 2.0L and the ECT.. #4500087
08/28/17 06:48 AM
08/28/17 06:48 AM
Joined: Oct 2005
Posts: 157
Toronto
CB900F2 Offline OP
CB900F2  Offline OP
Joined: Oct 2005
Posts: 157
Toronto
Hi All

I have a 2017 Hyundai Elantra with the 2.0L , and this engine has a ECT (Electronic Controlled Thermostat) and this is the first car I have owned with such a design coolant temp control system...

I have been pulling some live data off the car (obdii) and I have noticed the coolant temp fluctuates up and down a lot! like a toilet seat!.. I understand that the theory of a ECT is to maximize fuel burn by varying the coolant temp by opening the thermostat based on incoming data, but is this constant drop and rise is normal?

am planning to do a run on the high way with the cruse set and wanna see if I get the same up and down of the coolant temp as I am wondering if the ECU algorithm is will make the same changes to the coolant temp based on constant (flat) data coming into the ECU from its sensors..

My data is from a cold start, and the cars normal operating temp is 100 DegC based on the service manual.

Does anyone else have access to their cars live data for comparison? even if its not a 2017 Elantra 2.0l?.. but it would be ideal if its the same car as mine..



Re: 2017 Elantra 2.0L and the ECT.. [Re: CB900F2] #4500110
08/28/17 07:17 AM
08/28/17 07:17 AM
Joined: Dec 2015
Posts: 261
Ontario Canada
Canadastang Offline
Canadastang  Offline
Joined: Dec 2015
Posts: 261
Ontario Canada
While I don't have a vehicle with an electronically controlled thermostat, I have watched the Cylinder head temps on both of my cars and it does a very similar thing. IIRC both of my cars have 88*C thermostats and will go from 87/88-95C all day long.

Between the thermostat opening and the fans kicking on and off, there's gonna be some variation.

I wonder how much that thermostat will cost to replace eek

Re: 2017 Elantra 2.0L and the ECT.. [Re: CB900F2] #4500122
08/28/17 07:34 AM
08/28/17 07:34 AM
Joined: Sep 2015
Posts: 1,598
USA
mk378 Offline
mk378  Offline
Joined: Sep 2015
Posts: 1,598
USA
That looks typical of "bang-bang" control where the cooling method is either full on or off rather than proportional. Such as a fan starting and stopping. The amount of temperature variation is a trade-off of not having frequent stopping and starting which increases wear.

Re: 2017 Elantra 2.0L and the ECT.. [Re: mk378] #4500441
08/28/17 01:12 PM
08/28/17 01:12 PM
Joined: Aug 2003
Posts: 11,014
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 11,014
Buffalo, NY
Originally Posted By: mk378
That looks typical of "bang-bang" control where the cooling method is either full on or off rather than proportional. Such as a fan starting and stopping. The amount of temperature variation is a trade-off of not having frequent stopping and starting which increases wear.


That would be my guess too.


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: 2017 Elantra 2.0L and the ECT.. [Re: CB900F2] #4500582
08/28/17 05:10 PM
08/28/17 05:10 PM
Joined: Jun 2004
Posts: 2,476
St. Louis
MONKEYMAN Offline
MONKEYMAN  Offline
Joined: Jun 2004
Posts: 2,476
St. Louis
I don't have much to contribute to your question, but that data is cool. smile

On Highway I am getting 47 mpg or better with my Elantra so the thermostat must be doing it's job.


Truth alone triumphs, not untruth.

2017 Elantra SE
Re: 2017 Elantra 2.0L and the ECT.. [Re: MONKEYMAN] #4501024
08/29/17 06:37 AM
08/29/17 06:37 AM
Joined: Oct 2005
Posts: 157
Toronto
CB900F2 Offline OP
CB900F2  Offline OP
Joined: Oct 2005
Posts: 157
Toronto
Your getting 47 mpg!.. how the heck are you getting this on the highway?.. I was getting around 6.1L per 100km (38mpg).. But I would drive a bit hard sometimes during this period..

Thanks

Originally Posted By: MONKEYMAN
I don't have much to contribute to your question, but that data is cool. smile

On Highway I am getting 47 mpg or better with my Elantra so the thermostat must be doing it's job.

Re: 2017 Elantra 2.0L and the ECT.. [Re: JTK] #4501030
08/29/17 06:41 AM
08/29/17 06:41 AM
Joined: Oct 2005
Posts: 157
Toronto
CB900F2 Offline OP
CB900F2  Offline OP
Joined: Oct 2005
Posts: 157
Toronto
Here is a graph of my 2006 Honda Odyssey.. It does not have a ECT.. Just the old fasion thermostat.. and its very linear , both from cold start to operating temp, and then at operating temp, its pretty linear.. No bang-bang with its control of the coolant temp with cooling with the rad fan and/or the thermostat itself..





Originally Posted By: JTK
Originally Posted By: mk378
That looks typical of "bang-bang" control where the cooling method is either full on or off rather than proportional. Such as a fan starting and stopping. The amount of temperature variation is a trade-off of not having frequent stopping and starting which increases wear.


That would be my guess too.

Re: 2017 Elantra 2.0L and the ECT.. [Re: CB900F2] #4503043
08/31/17 06:34 AM
08/31/17 06:34 AM
Joined: Oct 2005
Posts: 157
Toronto
CB900F2 Offline OP
CB900F2  Offline OP
Joined: Oct 2005
Posts: 157
Toronto
bump

Re: 2017 Elantra 2.0L and the ECT.. [Re: CB900F2] #4503631
08/31/17 04:51 PM
08/31/17 04:51 PM
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,803
Crawfordville FL
What is the point of an electronic thermostat? Seems like needless complexity to me


2010 Ford Fusion SE 3.0L V6, 181 miles M1 HM 10w-30
Re: 2017 Elantra 2.0L and the ECT.. [Re: SilverFusion2010] #4503732
08/31/17 06:15 PM
08/31/17 06:15 PM
Joined: Oct 2005
Posts: 157
Toronto
CB900F2 Offline OP
CB900F2  Offline OP
Joined: Oct 2005
Posts: 157
Toronto
Thats what I am trying to find out...

Originally Posted By: SilverFusion2010
What is the point of an electronic thermostat? Seems like needless complexity to me

Re: 2017 Elantra 2.0L and the ECT.. [Re: SilverFusion2010] #4503874
08/31/17 08:15 PM
08/31/17 08:15 PM
Joined: Nov 2010
Posts: 808
VA
Thax Offline
Thax  Offline
Joined: Nov 2010
Posts: 808
VA
Originally Posted By: SilverFusion2010
What is the point of an electronic thermostat? Seems like needless complexity to me

The reasoning is to be able to more closely control engine temperature and the fuel/air ratio. The data shown on this graph is completely normal for the 2.0L NU Hyundai/KIA engine. Had to replace this very unit earlier this week, ECT stuck in the open position. Vehicle threw a code P0128. Pretty simple repair 1. drain coolant 2. remove belt 3. remove ac compressor 4. remove ECT, installation in reverse order.


2000 Ford Explorer Limited 5.0L AWD
2018 KIA Soul EX 2.0L
ASE P2 Parts Specialist
AIA Import Part Specialist
KIA certified Senior Technician, Hybrid certified.

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