i30 Owners Club

GOT PROBLEMS OR ISSUES? => DIESEL => Topic started by: mtuckeruk on September 11, 2010, 08:41:20

Title: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 11, 2010, 08:41:20
My ISG doesnt seem to work most of the time, I know it doesnt work straight away and that the car needs to be diven for 5 or 10 minutes before its active, but mine just never becomes active, on the rare occasion it may become active but like after 30 minutes of driving. Just doesnt seem right, Hyundai have already looked at it once and supposedly fixed it. Anyone else experiencing the same issues. Mine is the new 2011 i30 Estate Diesel
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on September 11, 2010, 08:55:21
Welcome mtucker.. we don't get the ISG over here.. my Camry Hybrid has a similar system and as you say you wouldn't expect it to work for the first 5 minutes or so when the car has warmed up it should be "good to go" (or rather good to stop).. :cool:

Nothing worse than having to harp to get something sorted  :rolleyes:

We have a couple of other members who have this feature will be interesting to see what they say...
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 11, 2010, 12:21:33
The following conditional are all required for the engine to stop:

Clutch pedal released
Shift lever in neutral
The engine coolant temperature is not too low (Over 45 degree/60 degrees*)
External temperature more than than 3c*
The Catalyst Converter temperature not too low (over 200 degree).
Not inhibitor condition for operating strategy or engine fault
- TPS, CKPS, CMPS, ECTS, VSS, Battery sensor, ISCA, BBVPS, Neutral Switch, Clutch Switch
After fulfill OBD monitoring
Battery charge status is adequately high.
No communication line error - LIN, CAN
Vehicle speed less than 5kph
Vehicle speed over 10kph at least once after key starting or idle starting
ISG OFF switch is off
Driver’s seat belt and Driver’s Door and hood are closed.
Battery temperature is between 2 to 60 degree.
Brake booster pressure not to low.
Not Blower max.
Hood/Bonnet not open.

If you think they are all met and it doesn't stop, then it's faulty. The system diagnosis procedure is long and I'm afraid it's best carried out by the dealer.

The following conditions cause the engine to automatically restart:
Not inhibitor condition for operating strategy
- TPS, CKPS, CMPS, ECTS, VSS, Battery sensor, BBVPS, Neutral Switch, Clutch Switch
Brake booster vacuum pressure becomes low.
When the battery charge status becomes low.
A certain amount of time has passed after the air conditioning is switched On.
If the fan speed of the climate control system is maximum speed. (windscreen is fogged)
Vehicle speed is over 5kph by rolling down a hill.

*these items are descrepancies between various sources of information.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: 2i30s on September 11, 2010, 23:33:57
thats amazing,all of that just to make the engine stop and start automaticaly.  :eek:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 12, 2010, 06:35:32
yeah makes me think how easy it may be for one of those conditions to not be met

i dont do much stop start driving, so if it stays off thats fine as well. I just like the lower tax band because of the ISG been installed.

I like the way that when the engine switches off and you are on a downhill and the car starts to 'free roll' that its starts up again automatically without touching the clutch or gears.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on September 12, 2010, 06:47:51
Fascinating technology when you look at it that way  :cool:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 12, 2010, 07:48:51
yeah makes me think how easy it may be for one of those conditions to not be met

i dont do much stop start driving, so if it stays off thats fine as well. I just like the lower tax band because of the ISG been installed.

I like the way that when the engine switches off and you are on a downhill and the car starts to 'free roll' that its starts up again automatically without touching the clutch or gears.

I have updated my post above because I noticed I'd missed a couple of important conditions out, and I've added all the automatic start conditions too. I'll cross-post this to the technical forum.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: 2i30s on September 12, 2010, 08:31:04
yeah makes me think how easy it may be for one of those conditions to not be met

i dont do much stop start driving, so if it stays off thats fine as well. I just like the lower tax band because of the ISG been installed.

I like the way that when the engine switches off and you are on a downhill and the car starts to 'free roll' that its starts up again automatically without touching the clutch or gears.
how do you brake if the engine isnt running? usualy the pedal and steering go rock hard.  :idea:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on September 12, 2010, 10:48:17
how do you brake if the engine isnt running? usualy the pedal and steering go rock hard.  :idea:

Electric assist for the brakes and steering ..all i30's have electric assisted steering (and i'm guessing the ISG version has electric brake assist too - like my Hybrid)
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: 2i30s on September 12, 2010, 11:19:11
i know about the electric steering but i didn't know about the brakes.  :razz:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: agentr31 on September 12, 2010, 13:55:59
there is enough vacume for 2 pushes of the pedal, try it when your car is turned off! after that its pretty hard! well not stupid hard like an old land rover, but firm!
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: stiby on September 12, 2010, 14:12:19
Have also a new 2011 i30 with ISG.After two weeks the isg refused to work.
The indication light in the ISG switch is always on.
During the first check in the garage they couldn't find the problem.
Next tuesday they will check the car again.
I hope they wiil find the cause. :-[
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 12, 2010, 14:31:06
Yes, the brakes are vacuum assisted. The ISG cars get an extra sensor, the brake boost vacuum presure sensor, if you brake too much and the pressure goes down the engine re-starts.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 12, 2010, 14:45:49
Have also a new 2011 i30 with ISG.After two weeks the isg refused to work.
The indication light in the ISG switch is always on.
During the first check in the garage they couldn't find the problem.
Next tuesday they will check the car again.
I hope they wiil find the cause. :-[


There are lots of things that can cause a fault condition in ISG:

TPS (Throttle position sensor)
CKPS (Crank shaft Position Sensor)
CMPS (Camshaft position sensor)
ECTS (Engine Coolant Temp sensor)
VSS
Battery sensor (On the top right of battery)
ISCA (Idle Speed control Actuator)
BBVPS (brake boost Vacum Pressure Sensor)
Neutral Switch
Clutch Switch

If the continune to have problems diagnosing the issue TSB HGE09-11-P050-FD might help them diagnose the problem (as mere customers we are of course not allowed to read such things, and being technicians they should already know).

Keep in mind I'm not an expert on the system, this is just a re-interpretation of other information, over which no one else can assert copyright. You might like to google the TSB number.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: eye30 on September 12, 2010, 18:03:06
Worth cross referencing to this thread:

https://www.i30ownersclub.com/forum/index.php/topic,6514.msg75046.html#new
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 12, 2010, 18:18:13
Ok, so if another person also had exactly the same problem i had then after 2 weeks, its probably better it just stays in the OFF position then. When it comes up to the end of the 5 year warranty I will telling Hyundai to disconnect it. But in the meantime I will asking for my £200 refund for ISG, I may just get lucky and have a lower tax band of £35/year
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 12, 2010, 18:29:44
I'd just get it fixed If I thought it was faulty.

 I really doubt they will refund you.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 12, 2010, 18:34:57
The indication light in the ISG switch is always on.

The ISG light in the switch or on the dashboard or both?
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: stiby on September 13, 2010, 10:37:14
The ISG light in the switch is always on.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 13, 2010, 13:47:57
as in my initial post Hyundai have already fixed this once(something about the battery). only 2 days after they apparently fixed it did it stop working properly again. Its not a reliable piece of equipment is it?

Mine is the same as Stiby , the light stays on, its located just below the ESP switch. When its working (which it isnt) the light goes off. This allows you to bypass it if you want by pushing teh button once when the light is off.

I havent seen any lights on the dashboard related to ISG, its an after market product(as far as I am aware) so there shouldnt be a light on dashboard.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: stiby on September 14, 2010, 18:26:51
Hyundai knows about the ISG problem.
They need to install a resistor as far as I understand.
It will be done next week in my car. This is good news
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 14, 2010, 18:52:50
Thats good news. Please try and get the detials of the modification to help others.

ISG definitely isn;t an aftermarket product, it's very integrated into to the car in the factory.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 17, 2010, 15:29:29
Hyundai just phoned to tell me to come pick it up. They say there is a 'recall' on this problem. He mentioned something about a modified wiring harness that needs to be fitted. They ordering the part and will be fitted at later date.

So there is definately a problem with the ISG, Hyundai agree
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: VatTas on September 21, 2010, 14:08:46
When it comes up to the end of the 5 year warranty I will telling Hyundai to disconnect it.
There are no such thing as "disconnecting" ISG in your car. ISG (Idle Stop and Go) is not only auto engine start/stop. It's also "intelligent" battery charging and some other things.
So issues with ISG can cause other problems than simply not turning engine off on idle...
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: eye30 on September 21, 2010, 18:41:25
I'm just wondering whether on my many trips I'm ever stopped long enough for this to be a worth while addition.

Besides the odd ocassion when I'm waiting in a Q to fill up at the petrol station the only other longish stops are at traffic light.

I know in UK it reduces the Road Fund Tax but .......................

I'd be interested to hear other UK owners thoughts.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on September 21, 2010, 21:48:36
I'm just wondering whether on my many trips I'm ever stopped long enough for this to be a worth while addition.

Besides the odd ocassion when I'm waiting in a Q to fill up at the petrol station the only other longish stops are at traffic light.

I know in UK it reduces the Road Fund Tax but .......................

I'd be interested to hear other UK owners thoughts.

I know I have a different car but it is a gr8 feeling when you pull up at lights or roadworks etc and the engine completly cuts out. The quietness is nice but also you are not stressing about wasted fuel.. If it was only a few hundred A$ more for an i30 with ISG (and it worked) I would opt for it even in Tassie...
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 21, 2010, 22:56:20
Well there is a button just below the ESP button for ISG, if you press this button it switches the ISG off. So would imagine it wouldnt be difficult to have this switch modified in such a way that its 'switched on' ie. the ISG is switched off all the time.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 24, 2010, 19:54:34
Hyundai phoned today, they say the part for the ISG recall has arrived, taking it on Tuesday to get fixed. Will try get more details on exactly what it is and what the problem is
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Shambles on September 24, 2010, 20:46:00
Hyundai phoned today, they say the part for the ISG recall has arrived, taking it on Tuesday to get fixed. Will try get more details on exactly what it is and what the problem is

That info will be so useful to so many members. Thanks :D
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 28, 2010, 13:58:54
Hyundai tell me its a 'wiring extension kit' , wires for ISG are too short and presumably not making contact properly.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: briandk on September 28, 2010, 18:32:19
I'm just wondering whether on my many trips I'm ever stopped long enough for this to be a worth while addition.

Besides the odd ocassion when I'm waiting in a Q to fill up at the petrol station the only other longish stops are at traffic light.

I know in UK it reduces the Road Fund Tax but .......................

I'd be interested to hear other UK owners thoughts.

I saw an article from a swedish paper where they tried to calculate how much you'd save if you used a start/stop system under favorable conditions  with lots of city driving. Unfortunately I can't find the article right now, but if I remember right the result was that in a year, you'll save a little under 1 liter of fuel, 0.9l if I remember correctly.

Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: eye30 on September 28, 2010, 20:24:24
I'm just wondering whether on my many trips I'm ever stopped long enough for this to be a worth while addition.

Besides the odd ocassion when I'm waiting in a Q to fill up at the petrol station the only other longish stops are at traffic light.

I know in UK it reduces the Road Fund Tax but .......................

I'd be interested to hear other UK owners thoughts.
I saw an article from a swedish paper where they tried to calculate how much you'd save if you used a start/stop system under favorable conditions  with lots of city driving. Unfortunately I can't find the article right now, but if I remember right the result was that in a year, you'll save a little under 1 liter of fuel, 0.9l if I remember correctly.

I wonder whether it will still be a selling point in 2 years.

I still have the opinion that this will be a bug bearer if it stops working and the cost of repair will be expensive.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Shambles on September 28, 2010, 20:40:59
... if I remember right the result was that in a year, you'll save a little under 1 liter of fuel, 0.9l if I remember correctly.


I recall reading something similar. Coupled with the additional manufacturing cost of the battery/alternator plus all the added electronic control systems and sensors, is ISG really all that "green"?
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 28, 2010, 21:31:50
yep ISG only really worthwhile for the lower road tax band, thats about it.....
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on September 28, 2010, 21:53:13
Maybe we should rename this thread "i30 fairly dumb stop and go"... :idea:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on September 28, 2010, 22:43:21
Maybe we should rename this thread "i30 fairly dumb stop and go"... :idea:

or "very Idle stop stop and go"
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on September 29, 2010, 08:38:29
UPDATE: well Hyundai called me late yesterday and said they replaced this part 'wiring extension kit' but its still not working, so they looking into other reasons why it may not be working. So the car had to sleep overnight at Hyundai, lets see what they got to say today. Maybe I should just tell them to just disconnect the damn thing, its not making much difference whether its working or not working......
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: a7v8x on December 10, 2010, 21:28:15
MMMM about to leave a deposit on a new i30 cw tomorrow. The first of the ISG facelift models are about to land on Irish soil or so I have been told. My main reason for opting for the ISG was the fact that it lowered the road tax from €156 to €104, but looking back on previous posts I hope it does not come back to bite me  :neutral:

Having said that, the 5 year unliimited mile warranty should set my mind at ease.

Roll on January the 4th  :D
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: mtuckeruk on December 11, 2010, 08:42:56
since my recall, the ISG is working very well, all i can suggest is that if it doesnt work like after 15 to 20 minutes of driving then there is a problem and you need to do recall

once recall is done you should be fine

I have been watching this ISG carefully to see when it works and doesnt work, I have noticed a few things. Now there is a long list of prerequisites for it to work which was listed in a previous post. But in simple terms you will notice the following:-

Below 6 or 7 degrees celcius it generally doesnt kick in due to cold weather which is fine as I sure certain temperatures in the system need to be reached for it to work, perhaps the coolant hasnt reached a desired temp for ISG

So during winter it kicks in less often and in summer it works very quickly even after 5 minutes of driving sometimes. Winter driving above 6 degrees could take 20 minutes of driving.

The engine temperture does not have to be at the 90 degree celcius for it to work it can be less than 90 degrees , mine has kicked in at 60 or 70 degrees

In winter when you have the heater on and the ISG kicks in, it will blow all the warm air out and start to blow cold air on you after about 20 seconds, which can be a bit annoying so you may have to switch off heater at long red traffic lights.

I have also noticed when the engine restarts the headlights flicker a bit due to the power been drawn from the battery, small issue though.

Overall, I would recommend the ISG option not only to reduce road tax but to save a small amount of fuel as well. There is a button on the right side below the headlight levelling button where you can switch OFF the ISG if it annoys you, sort of like a bypass. Luckily this does not affect your road tax hey?

Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Lorian on December 11, 2010, 09:13:11
Good result, glad its working now.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on December 11, 2010, 20:45:27
Thanks for the update was wondering how you got on.. :D
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: VatTas on January 07, 2011, 15:04:55
I noticed that ISG on my car doesn't react to cold weather any more. It was ~ -15C and I was very surprised when the engine turned off at the red light. Also it looks like it notices that it is cold outside when starting for the first time (ISG button lights up and engine won't turn off), but if you leave the car for some time and start it again, ISG becomes activated.

Will have it checked out on my 1st year/20000km service.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Phil6xy on March 12, 2019, 17:06:58
Hi all great to read that I'm not the only one suffering from Hyundai's ISG.
I tested my battery at 12.6v no stop start.so after reading about the way  it charged I turned out every thing and 3rd geared it down my local massive hill (3times) pulled up at home and hey presto stop start was active  :crazy1:
Thanks all :goodjob2: :fum: :goodjob:
Phil.
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: CraigB on March 12, 2019, 17:35:39
Hi all great to read that I'm not the only one suffering from Hyundai's ISG.
I tested my battery at 12.6v no stop start.so after reading about the way  it charged I turned out every thing and 3rd geared it down my local massive hill (3times) pulled up at home and hey presto stop start was active  :crazy1:
Thanks all :goodjob2: :fum: :goodjob:
Phil.
Great that you solved your problem :goodjob2:

For future reference I'd suggest looking for a more recent topic or starting a new one, being 8 years old and concerning models older than your own might not always be relevant  :)
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on March 12, 2019, 22:40:35
I've heard Hyundai are going to rename their ISG as Insipid Stop and Go.. (It isn't very good!)  :snigger:
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: chrisdarl on May 27, 2019, 22:06:39
Incase it helps anyone, my autostop had never worked since I owned the car (2nd owner) but it turned out my battery terminal connection was slightly loose, one day I tightened the nuts and it's been working daily since! Worth a check for anyones thats not enabling?
Title: Re: I30 Intelligent Stop and Go (ISG)
Post by: Dazzler on May 27, 2019, 22:18:35
Thanks Chris. Appreciate you sharing that.  :goodjob:
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