Regarding the engine stop start feature

[i2canoe]

Sometimes the engine stop start works fine.
Stopping the motor at red lights and restarting as required.
Other days it does not ... the motor just continues to run.
Anybody else notice this?

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[Rhinebeck01]

Sometimes the engine stop start works fine.
Stopping the motor at red lights and restarting as required.
Other days it does not ... the motor just continues to run.
Anybody else notice this?

@i2canoe

Reasons why stop start will be AOL:

.Driver ’s seat belt is not buckled.
• Driver ’s door is not closed.
• Battery temperature is too warm or cold.
• Battery charge is low.
• The vehicle is on a steep grade.
• Cabin heating or cooling is in process and an acceptable cabin temperature has not been achieved.
• HVAC is set to full defrost mode at a high blower speed. • HVAC set to MAX A/C.
• Engine has not reached normal operating temperature. • The transmission is not in a forward gear.
• Hood is open.
• Transfer case is in 4LO or Neutral
• Brake pedal is not pressed with sufficient pressure.

Other Factors Which Can Inhibit Autostop Include:
• Accelerator pedal input.
• Engine temp too high.
• Vehicle speed threshold not achieved from previous auto-stop (2 mph (3 km/h) BSG, 5 mph (8 km/h) ESS.
• Steering angle beyond threshold.
• ACC is on and speed is set.
• Vehicle is at high altitude.
• System fault present.
• Low fuel is detected.

It may be possible for the vehicle to be driven several times without the STOP/START system going into a STOP/ START READY state under more extreme conditions

 

[MRH512]

Sometimes the engine stop start works fine.
Stopping the motor at red lights and restarting as required.
Other days it does not ... the motor just continues to run.
Anybody else notice this?

Not sure of your exact experience, but I have the ESS and, if you're trying to cool/ warm the cabin and the computer senses the cabin temperature isn't optimal, it will disengage the ESS and kick the AC or heater back on.

This was my fist ESS system and I also came to realize I had a bad habit of letting my foot off the brake a little bit at lights. This too will disengage the ESS.

 

[Gee-pah]

Sometimes the engine stop start works fine.
Stopping the motor at red lights and restarting as required.
Other days it does not ... the motor just continues to run.
Anybody else notice this?

Gerald: the top reason I've found why people's ESS doesn't engage is because the batteries lack sufficient charge.

Funny enough @WranglerMan and I just finished helping someone with this issue here: https://www.jlwranglerforums.com/forum/threads/ess-problems-need-input.76146/post-1590331

A solution often comes from connecting a trickle charger to the main battery's (I'm assuming a 3.6L JL) terminals while it is parked.

As both batteries (again 3.6L JL) are connected in parallel when the vehicle is at rest, this trickle charger will charge both batteries.

I know--it seems stupid to have to do this...and the irony of using one form of energy (shore power electric) to get savings on another (ESS and fuel) is irony not lost here. Many a thread has been written on the poor design of the ESS system, not the least of its faults being two dissimilar size batteries.

The thread I linked to also guides the owner on how to obtain the voltages in each battery separately. Simply placing your meter on the terminal of the main battery will give you a composite voltage of both batteries.

Oh--also, ESS won't engage if the steering wheel is turned too much. User @Jebiruph found that power steering in an ESS event is powered by the main battery, so I guess the vehicle is smart enough to not stop the engine when the main battery--which bears the lion's share of getting the vehicle cranked after an ESS event---is bearing the load of running the power steering.

 

[LuvHydro]

Can one disable the ESS permanently with one of those programmer gizmos?

 

[Gee-pah]

Can one disable the ESS permanently with one of those programmer gizmos?

One can use a programmer to make sure that ESS doesn't engage--and that's the important thing.

Not to be pedantic, but to make a point, I'm not quite sure that I'd call it "disabling ESS." For example, one methodology involves the software of such a device doing the software equivalent in CANBUS code of turning on the ESS off button if it isn't on.

Suppose you traveled with your kid, whose job it was every time you started your JL to make sure that ESS was turned off.

If you believe that your kid "disables" ESS then so be it. If you believe that your kid simply makes sure that ESS is off...then so be it.

Semantics.

 

[Chupacabra]

If you have the fancier digital dash, one of the center screen pages will tell you why it's not engaging the ESS.

 

[west tex]

What I've noticed is that the ESS rarely kicks in if the A/C is on.

 

[LuvHydro]

One can use a programmer to make sure that ESS doesn't engage--and that's the important thing.

Not to be pedantic, but to make a point, I'm not quite sure that I'd call it "disabling ESS." For example, one methodology involves the software of such a device doing the software equivalent in CANBUS code of turning on the ESS off button if it isn't on.

Suppose you traveled with your kid, whose job it was every time you started your JL to make sure that ESS was turned off.

If you believe that your kid "disables" ESS then so be it. If you believe that your kid simply makes sure that ESS is off...then so be it.

Semantics.

Gotcha

 

[Wolfy]

I hated ESS and bought one of these. If you like the auto-stop, leave it on. If it bothers you, turn it off, and it remembers the last setting. At $100 I consider it a great value relative to the annoyance. (I never turn ESS on ).

 

[tubesock]

If you have the fancier digital dash, one of the center screen pages will tell you why it's not engaging the ESS.

The base dash does this as well.

 

[WranglerMan]

Can one disable the ESS permanently with one of those programmer gizmos?

The cheapest way is JSCAN but it does not do a good job at all as one has to disable a hood switch and then remote start does not work then the pricer Tazer Mini is at the higher end and over kill if all you want to do is kill ESS and then you have things like Smart Stop/Start and Auto Stop Eliminator, If all you want to do is disable ESS I would suggest the SSS module, I have been running it for several years when Steve first released it and I did a review on it and it’s been in for several years and has been flawless and never failed and it never needs a update or has to be removed as it’s a pass thru module so service tools at the Dealer will never know it’s there unless they look under the dash.

If you are wanting other things done I would suggest the Tazer Mini as Joe and his crew keep adding and adding more and more to it, it’s a pretty simple module to install but you need to unmarry it and remove before service, for all my programming needs outside of ESS I use JSCAN as it pretty cheap and does a lot and you just DL an app and pay a small one time fee but you do have to purchase a few other items to make it work but it’s still under $75 total.

In the end you as the owner have to decide what you are wanting to mod ( bigger tires, Speedo recal, control lights, tire settings etc..) and then go from there.

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