3.6L ESS IBS Information

[Jebiruph]

I thought I'd start this thread for discussing the operation of the IBS. First is a link to the technical description of the IBS from Bosch. The rest of the post is my interpretations and observations.

https://www.bosch-mobility-solution...s/body-electronics/electronic-battery-sensor/

The IBS (Intelligent Battery Sensor) provides battery status information used by the ESS system to determine if there is enough power to restart the engine from an auto stop. If there isn't, ESS will be disabled.

The Main battery is the starting battery. The IBS is attached to the ground terminal of the Main battery and monitors the battery current, voltage and temperature to calculate the following characteristics of the Main battery;
SOC (state of charge) = percentage of battery charge (deliverable charge)
SOH (state of health) = current ability of the battery to hold a charge (battery ageing)
SOF (state of function) = ability to power a start (prediction of voltage drop under load)

This information along with the current, voltage and temperature are available to the ESS system and can be used to determine the overall condition of the Main battery, I don't know if FCA uses it all or not.

The Aux battery voltage must be monitored during auto stop, low Aux voltage during auto stop should initiate a restart. I am not aware of any other Aux battery monitoring. I attribute a lack of Aux battery condition monitoring for the unexpected Aux battery failures.


The first diagram shows the IBS on the Main battery negative terminal.

This diagram shows how the Main battery current passes through the IBS for monitoring, but the Aux battery current bypasses it during normal operation. The exception being if one battery is charging the other.

(updated 04/13/2019)
Additional 3.6L ESS system information is available here.
3.6L ESS Dual Battery Consolidated Information
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.2

Sponsored

 

[WranglerMan]

This makes a lot of sense to me as my ESS said it was unavailable as the battery was charging but it never fully charged to meet the needs of the IBS so ESS was disabled but after the main battery was tested and found to be defective and was replaced ESS returned to normal operation

 

[timn1984]

I thought I start this thread for discussing the operation of the IBS. First is a link to the technical description of the IBS from Bosch. The rest of the post is my interpretations and observations.

https://www.bosch-mobility-solution...s/body-electronics/electronic-battery-sensor/

The IBS (Intelligent Battery Sensor) provides battery status information used by the ESS system to determine if there is enough power to restart the engine from an auto stop. If there isn't, ESS will be disabled.

The Main battery is the starting battery. The IBS is attached to the ground terminal of the Main battery and monitors the battery current, voltage and temperature to calculate the following characteristics of the Main battery;
SOC (state of charge) = percentage of battery charge (deliverable charge)
SOH (state of health) = current ability of the battery to hold a charge (battery ageing)
SOF (state of function) = ability to power a start (prediction of voltage drop under load)

This information along with the current, voltage and temperature are available to the ESS system and can be used to determine the overall condition of the Main battery, I don't know if FCA uses it all or not.

The Aux battery voltage must be monitored during auto stop, low Aux voltage during auto stop should initiate a restart. I am not aware of any other Aux battery monitoring. I attribute a lack of Aux battery condition monitoring for the unexpected Aux battery failures.


The first diagram shows the IBS on the Main battery negative terminal.

This diagram shows how the Main battery current passes through the IBS for monitoring, but the Aux battery current bypasses it during normal operation. The exception being if one battery is charging the other.

This might be what's happening to mine. Mine says "ESS not ready battery charging" . Great information.
Thanks....

 

[timn1984]

Mine said battery charging for a while, just took it to dealer yesterday, they replace the battery, and it works fine now. If anyone is having problems with ESS, its probably the battery.

 

[allieboy]

@Jebiruph
LOVE all you do! If ESS battery dies and i use n2 to n1 jumper and remove ess neg cable...will a good powerpak jump the 3.6?

 

[WranglerMan]

@Jebiruph
LOVE all you do! If ESS battery dies and i use n2 to n1 jumper and remove ess neg cable...will a good powerpak jump the 3.6?

I’m thinking it would as your only trying to boost one battery

 

[Jebiruph]

@Jebiruph
LOVE all you do! If ESS battery dies and i use n2 to n1 jumper and remove ess neg cable...will a good powerpak jump the 3.6?

There are too many variables for a definitive answer. How dead is the battery, how good is the good powerpak, what's the temperature, how long since the powerpak was charged ... You will improve your chances by eliminating a dead ESS battery.

 

[WranglerMan]

There are too many variables for a definitive answer. How dead is the battery, how good is the good powerpak, what's the temperature, how long since the powerpak was charged ... You will improve your changes by eliminating a dead ESS battery.

I just wish the ESS battery was in a better location to work on it.

 

[timn1984]

Just wanted to give my observations regarding ESS, and not start a new thread. I’ve had my Jeep since October 2018 and had real trouble understanding how and when the ESS works. Some days it works right away and others it never works. My observations are that if it’s cold outside, and I’m talking anything below 40 degrees or around that, ESS will not work until the engine totally warms up and this may be after 20 minutes of driving. I have two major messages that seem to pop up on the dash for different reasons. One is “ESS not ready battery charging”. And the other is “ESS not ready engine too cold”. So I was wondering for those of you that really understand this, if ESS doesn’t work when it’s cold , if you are in a really cold climate, it may never work. Is this a correct assumption? And if so what is the use in cold climates? Just one of life’s mysteries I guess.....

 

[Rhinebeck01]

Just wanted to give my observations regarding ESS, and not start a new thread. I’ve had my Jeep since October 2018 and had real trouble understanding how and when the ESS works. Some days it works right away and others it never works. My observations are that if it’s cold outside, and I’m talking anything below 40 degrees or around that, ESS will not work until the engine totally warms up and this may be after 20 minutes of driving. I have two major messages that seem to pop up on the dash for different reasons. One is “ESS not ready battery charging”. And the other is “ESS not ready engine too cold”. So I was wondering for those of you that really understand this, if ESS doesn’t work when it’s cold , if you are in a really cold climate, it may never work. Is this a correct assumption? And if so what is the use in cold climates? Just one of life’s mysteries I guess.....

@timn1984

Thanks for not starting another ESS related thread.

About your message“ESS not ready battery charging”. It could very well be the frequency of use of your JL, length of your trips, how long the JL sits parked and unused and other factors that are causing the Aux battery to be depleted enough where you occasionally, see that message.

I'd have to hear more from you in regard to your habits lets say but you may very well be a poster boy for why it is good to own a trickle charger and routinely use it on your JL.

As for the cold and ESS not working til the JL has warmed up... I have been following the ESS posts for months now / this Winter and even the guys where it gets very cold (Canada, etc) are seeing ESS work, as soon as the JL warms up.

.

 

[timn1984]

@timn1984

Thanks for not starting another ESS related thread.

About your message“ESS not ready battery charging”. It could very well be the frequency of use of your JL, length of your trips, how long the JL sits parked and unused and other factors that are causing the Aux battery to be depleted enough where you occasionally, see that message.

I'd have to hear more from you in regard to your habits lets say but you may very well be a poster boy for why it is good to own a trickle charger and routinely use it on your JL.

As for the cold and ESS not working til the JL has warmed up... I have been following the ESS posts for months now / this Winter and even the guys where it gets very cold (Canada, etc) are seeing ESS work, as soon as the JL warms up.

.

I drive 2 miles to work 5 days per week. Run errands occasionally about 2-4 miles. Occasionally go out of town 150 miles but only once every other month or so. So I guess my car sits for a major part of every day. I have recently gotten the ESS battery replaced. I wonder if my battery is not g eating fully charged. Maybe a dealer visit?? Not sure what to do. The trickle charger sounds interesting but I think there may be something else going on.

 

[Rhinebeck01]

I drive 2 miles to work 5 days per week. Run errands occasionally about 2-4 miles. Occasionally go out of town 150 miles but only once every other month or so. So I guess my car sits for a major part of every day. I have recently gotten the ESS battery replaced. I wonder if my battery is not g eating fully charged. Maybe a dealer visit?? Not sure what to do. The trickle charger sounds interesting but I think there may be something else going on.

@timn1984

The more you say, the more, I feel you are a poster boy for having and routinely using a trickle charger.

With all those short trips, 30 miles a week driving the JL, multiple times the vehicle is started, Uconnect using 12v, etc, etc.... and the JL's alternator just isn't given enough drive time to charge up the Aux battery. Then the JL is sitting lots and while sitting it is always using some 12v power... ......Again, you are undoubtedly a poster child for trickle charging.

Consider getting a decent trickle charger ($45+-) and also installing the quick disconnect cable that comes with it. Now, connect the trickle charger for a few hours every week or so. I've suggested this to other's here and they .... after a few weeks pm'd and said... no more “ESS not ready battery charging”.

In closing, my feeling is, especially, a JL owner ..... needs a decent battery trickle charger and a quality set of battery jumper cables in their arsenal.

.

 

[Jebiruph]

I drive 2 miles to work 5 days per week. Run errands occasionally about 2-4 miles. Occasionally go out of town 150 miles but only once every other month or so. So I guess my car sits for a major part of every day. I have recently gotten the ESS battery replaced. I wonder if my battery is not g eating fully charged. Maybe a dealer visit?? Not sure what to do. The trickle charger sounds interesting but I think there may be something else going on.

My driving pattern is very similar to yours, 5 miles daily to work, 30 miles to church on Sunday and occasional errands. I live in a cold climate and my ESS always works once the engine warms up. I'm pretty sure “ESS not ready battery charging” is referring to your main battery because that's what the IBS monitors. A bad ESS battery could drain the main battery over night, but if you are still having charging issues with the new ESS battery, there might be other problems. You can either have the dealer check it out again, regularly trickle charge it to see if that helps, use a voltmeter to monitor battery voltages yourself, or any combination of those until the issue is resolved.

 

[Rhinebeck01]

@Jebiruph
@timn1984

I spewed Aux battery because Aux battery was mentioned in @timn1984 's post and thus, I subsequently/inadvertently, spewed Aux..

My point was that the "driving pattern" mentioned may well be what the issue is. YES, could be that there is still in fact a problem with the JL.

@Jebiruph, yes, you let me know, long ago, that the IBS monitors the Main. 8-)

Curious, Jerry... are you routinely using an intelligent battery tender? I am.

I have a quick disconnect cable installed that leaves the connection end in the passenger side wheel well. I do not have to open the engine compartment hood with this set-up.

While I do lots of long distant driving, I do routinely have a couple of weeks when the JL gets a little rest lets say. That is when the Battery Tender comes into play.

.

 

[Jebiruph]

@Jebiruph
@timn1984

I spewed Aux battery because Aux battery was mentioned in @timn1984 's post and thus, I subsequently/inadvertently, spewed Aux..

My point was that the "driving pattern" mentioned may well be what the issue is. YES, could be that there is still in fact a problem with the JL.

@Jebiruph, yes, you let me know, long ago, that the IBS monitors the Main. 8-)

Curious, Jerry... are you routinely using an intelligent battery tender? I am.

I have a quick disconnect cable installed that leaves the connection end in the passenger side wheel well. I do not have to open the engine compartment hood with this set-up.

While I do lots of long distant driving, I do routinely have a couple of weeks when the JL gets a little rest lets say. That is when the Battery Tender comes into play.

.

We had simultaneous replies, I did not see yours until after I posted mine, so nothing in my post was directed at yours.
I am not doing any trickle charging. Everything works and I don't get any error messages. The only issue I have is my running voltage is almost always high (14.7v), regardless of whether the ESS battery is connected or not. On a properly functioning system it should fluctuate based on current need.

Sponsored