2019 stops engine at most stops, sometimes not, but no relation to electric draw etc...... no clue why sometimes and not others.

Not warmup, may stop it when part warmed, or not when fully warmed. Sometimes not after longer drives, battery surely must be charged then......

no biggie, just weird.

 

You can turn off auto stop by pushing the button each time after you start the engine

Auto stop has its own check list for when it shuts off the engine, do not know all of them

It is used on newer vehicles to meet the stricter idle emissions standards, an idling engine needs a Rich fuel mix to prevent over heating so was always a pain to get idle emissions lower, shutting off the engine does that

Its not for better MPG, engine needs to be off for over 5min for that, restart takes more fuel than idling for 5min, so emissions is the only reason

You can buy a plug-in auto stop eliminator for the new Ranger, so you don't have to push another button after startup, it remembers you last selection, i.e. use auto stop, or disable auto stop, so you can change it as you see fit

 

Eh, I like it stopping just fine. Wish it did it more. Seems NOT to do it when I have a long light, often does it at a stop sign.... go figure.

It may do it whenever it is "closed loop" on emissions, which will be after it has warmed up a bit. Does it faster after it has sat a bit, even if not up to temp. Will not do it when first started.

Some inputs are electrical, it will restart if the battery drain goes up.... try suddenly flipping the blower motor to a high setting, the motor will start. shifting to park will restart it. Others may have to do with emissions or engine temp, or a combo of both.

Disagree on mileage.... on a new tank, up to a couple hundred miles, the fuel flow based MPG drops a few tenths of a mile for any stop over 20-30 sec with engine idling. It can be significant. Fuel flowing, no miles driven. The "hypermiling" folks always turn off at stoplights.

 

As for the MPG I will take your word for it, but the physics of internal combustion engines shouldn't show that

 

Fi engines do not waste as much fuel starting as old carb engines. EFI even less

 

No they don't, but still need to run Richer to reheat the Cats

 

No doubt... That would depend on the time off, and in any case would be directly related to the engine control going "closed loop" which only happens when the cats are hot enough. I do not know how long it takes to cool the cat below optimum temp, Less than an hour for sure, and clearly more than a couple seconds.

The catalysts kill MPG anyhow, because there always has to be sufficient excess fuel (and air) to keep them hot. So that is somewhat of a constant drain. And idle would require proportionately MORE fuel for the cat, since the exhaust volume is low, although airflow cooling is also reduced.

Interestingly, last night, after driving 200 miles since prior stop, the system did NOT cut odd the engine at all on the last few miles of city driving. Engine etc would have been as hot as they would get. I recall noticing that it did not cut off on ANY stop during 600+ miles of driving.

This morning, it naturally did not cut off during a 2 mile errand, even though it was substantially warmed up toward the end of the trip. But 2 or more hours later, it cut off on the first stop, even though the engine temp was barely off the peg. No idea what the catalyst temp was, of course, but in a half a block I would not expect them to be very hot, and 2 hours would definitely cool them off.

 

On my Ranger you can go to thru the settings on the dash and it will show you when the system is active and if it isn't on it will tell you why (i.e. A/C on, Battery charging, etc.)

 

Well, the system is "activated", i.e. not shut off. Beyond that I have seen no such info when looking through the various screens.

If I intentionally shut it off, there is a notice given, and there may be the symbol with a strike-through, but I have not checked for that, and in any case that is not seen when it is not shutting off..

Page 138 of the manual gives a list of conditions, but they seem to have left out a few, and some I have not encountered. Nothing listed seems to be the issue when it does not do the shut off, so I just do not know what is (or is not) going on.

 

It is in the fuel economy section of the instrument cluster on the Lariat. First screen shows current mpg, second shows average for last time frame, and the third screen shows auto start/stop condition. If I have it on the third screen while driving and I stop the screen will tell me if on due to heating/cooling, electrical draw, etc.

 

Lariat may have different software. I have base model. Have been through all the screens and did not see most of what you describe.

Only MPG is average for trip. The rest are not present as far as I know.

 

According to the owners manual you have to meet the following for it to work:

The system is automatically enabled every time you start your vehicle if the following conditions are met:
• The Auto-Start-Stop button is not pressed (not illuminated).
• Your vehicle exceeds an initial speed of 3 mph (5 km/h) after you have initially started the vehicle.
• Your vehicle is stopped.
• Your foot is on the brake pedal.
• The transmission is in drive (D).
• The driver's door is closed.
• There is adequate brake vacuum.
• The interior compartment has been cooled or warmed to an acceptable level.
• The front windshield defroster is off.
• The steering wheel is not turned rapidly or is not at a sharp angle.
• The vehicle is not on a steep road grade.
• The battery is within optimal operating conditions (battery state of charge and temperature in range).
• The engine coolant is at operating temperature.
• Elevation is below approximately 10,000 ft (3,050 m).
• Ambient temperature is moderate.

The green Auto-Start-Stop indicator light on the instrument cluster will illuminate to indicate when the automatic engine stop occurs.
If the instrument cluster is equipped with a grey Auto-Start-Stop indicator light, it is illuminated when automatic engine stop is not available due to one of the above noted conditions not being met.

It might have been the window defrost was needed in the morning and not in the afternoon.

 

Window defrost? Ummmmmmm......... There is no such thing on the truck.

That is the list from page 138 that you showed. Those do not, or should not apply.

And, some of them appear not to be even true. The system WILL WORK when the temperature gauge is not even off the peg, and cabin is cold. But may fail to work when temp is up to normal. Or it may work fine.

All the conditions in the list that are obvious are met when it is not working. Cannot swear to brake vacuum or battery state, but if battery state is low after a long drive, well, there is a different problem. Brake vacuum? Should be fine after a decel and short time idling, same as in traffic when system DOES work.

BTW, condition "foot is on the brake pedal" is not true..... your foot must depress the pedal a certain significant amount, already know that. Brakes can be "on", and yet the system is still disabled due to "foot not on the brakes", because pedal is not down far enough.

 

Spent some time going through all the screens, and finally found what you re talking about. Thanks for the heads up.

I will keep an eye on it and see what it says.

 

So far, the "exceptions" I have seen are:

"Engine cold"
which is natural and expected. Odd only in that the engine does not have to be very warm.... the gage is brely off the peg when it is OK to auto-stop.

"engine on until next stop"
Which is a catch-all that appears a lot. CAN appear if you are creeping in traffic and do not exceed the threshold speed, but no reason it should appear 8x in a row for normal driving and regular stops.

"vehicle charging"
Saw this one time.....Ok, maybe, but seems odd that it would appear for 6 stops over several miles, then NOT appear immediately after being parked and then starting engine. This truck does NOT have window defrost heaters or heated seats, and nothing unusual had gone on, no long stops with engine off, etc. In fact, I have had the truck stopped with engine switched off but electric (fan etc) on, for longer times, and it went into normal auto-stop operation immediately after starting and driving away.

I may not have the exact wording, but those are the only ones I have seen other than the "normal operation" and "engine stopped" messages. The auto-stop seems pretty inconsistent, and the "on until next stop" is very non-helpful as far as understanding anything.

Inquiring minds want to know.

 

This is from Ford for 2016: https://static.oemdtc.com/GSB/G0000115.pdf

But I am sure parameters have been updated since then

Outside temp plays a roll in engine heat threshold and battery temp(charging)

 

That is interesting, but seems hopelessly out of date, as you suspected. Several things that are listed no longer have the effect noted, or do not even exist.

There is no "gray" indicator, for instance. It simply either does auto-stop, or not, with no comments.
Blower speed has no effect unless turned way up suddenly.
The hill slope does not appear to affect operation.
I do not think the low fuel has any effect.
The number of restarts is not related to speed, it will only activate once unless you exceed about 10 mph, for a certain time (not 10 restart limit unless you exceed 2.5 mph) So if you are creeping in traffic, the auto stop will function once, and then the motor stays on.
Steering seems to be OK at an angle, but if you move it, yes it will restart.
Moving the selector to park does NOT allow the engine to stay off, it restarts the engine, and it will then stay on indefinitely (you cannot move to "park" without going through N and R)

Also, per that, the battery would need to be below 11.3V to deactivate the auto-stop, which is very substantially discharged. Possibly the "charging" indication is really to warm up the battery, but it would be just as simple to indicate that condition as "battery cold", or similar..

Most of the conditions listed make some sense. Not sure about the 15% grade, or the 1/8 full tank, but those may be related, and have to do with peculiarities of certain fuel tanks, I suppose.

I'm not too worried about it, but it does "give one to think" when the truck continues to say "charging" for a long time. It's not a hybrid, after all.

 

There are a few things that will prevent Auto Stop Start from happening.
If the battery is low, and cannot keep a charge, that will keep your truck from shutting down, a defective battery is not out of the question for a brand new vehicle.
Gear selector in S mode, will not Auto Stop Start.
Defroster on, truck will not Auto Stop Start. BTW All modern vehicles have a front window defroster.
Hope this helps.

 

Actually that is all in the book, page 108 and following. Or in the info linked in an earlier post.

However, there is NO defroster, in the sense of heated windshield... THAT would be an electrical drain that would not allow auto-stop. Truck is not equipped with that option.
If you turn on the regular windshield defroster, that does NOT prevent the autostop. If you want "MAX" defrost, you have to turn the fan to max speed, and that itself turns off the autostop. Any speed below max allows autostop, although rapidly turning it up, even without reaching max speed, will restart the engine.

Gear selector anywhere except "D" forces engine to stay on, including park, so, yes, I am sure "S" does as well.

The "most popular" message (other than engine cold) given about the autostop is "engine on until next stop", which may persist for 10 stops, even if spaced several blocks, or miles, apart. It gives no information.

The only other message I have seen was one time, the "vehicle charging" persisted for 10 stops or so. I have not measured the voltage, but that message is supposed to appear only below 11.3 V, which is very nearly a dead battery. The battery has not shown itself to be low in any practical way, so it seems unlikely. Furthermore, the vehicle had not sat for any length of time, only overnight, and the message disappeared after the vehicle has been shut off a nd restarted. It did autostop less than a block from the place it was started and immediately driven from, so if it had been low, and had just started the vehicle, it should have been even lower.

It's an interesting question. Most likely Ford has not got all the bugs out yet. Against my usual preferences, I bought a first year vehicle, the 2019 is a new production truck, that has not been made before in the US version. I am not fond of being an "early adopter", but I needed a new truck and nothing else was very driveable in my opinion.

 

Saw the "vehicle charging" again tonight, at the end of a 15 mile drive at mostly highway speeds. No indication of a charging failure, and no indication of a low battery. On the drive back a few hours later, it auto-stopped just fine once it warmed up (it is about 0C here, so the engine cools off fairly fast)..

 

I saw the "vehicle charging again, and I have come to the conclusion that the issue is that that particular condition does not "reset" during one "on time event", in other words, that it will not detect a full charge and give the "OK" to the autostart while the engine is operating.

I base that on the observation that if the "vehicle charging" is on, it seems not to allow autostart until the engine has been turned off. Even a short "off" time appears to reset it, and, obviously, if the battery really were not up to charge, it would not be getting better while the engine is off, certainly not when the drain of an engine start is added. So, if there were a real problem with the battery, one would expect the charging would resume and continue when the engine is restated. That does not seem to be the case.

So far, no matter the length of the "off" time, turning off and restarting seems to clear the "vehicle charging" message and allow the autostart to operate. It appears to be a "bug", although I do not know if that is due to software, hardware, or a combination.

 

I know this is a couple years old and I assume you have resolved this issue. I just ran into it with my 2021 Ranger, the Auto Stop/Start was not engaging, not a big deal in general, but wanted to know why. I started monitoring the status screen and mine would always state "Vehicle Charging". I checked battery voltage, it would read in the low 12v range when the truck was off, and mid to high 14v range when running. I took the truck to Autozone to test the battery and though it had the voltage and was starting fine, the battery was bad. I put in a new battery and now the system is working without issue.