Battery swap and truck memory

[ControlNode]

There is nothing to save though, seems like a waste of time.

There are several modules that have volatile memory, so they would have to relearn, while it takes no action on your part for them to relearn, it's still a process that has to happen. Sometimes you may notice the transmission is not acting the same or you may notice nothing. To me it's worth maintaining all of that unless I have a reason to reset all of that as part of a process I'm following.

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[Grandaccess]

Use a Jump Pack on the battery terminals so when you take it off the battery it will take over....
the brain should re-sink itself to the new battery in a day after it gets the new baseline for SOC

 

[Loweredon33s]

There are several modules that have volatile memory, so they would have to relearn, while it takes no action on your part for them to relearn, it's still a process that has to happen. Sometimes you may notice the transmission is not acting the same or you may notice nothing. To me it's worth maintaining all of that unless I have a reason to reset all of that as part of a process I'm following.

But they don’t, that’s what I’m saying. While an older vehicle might benefit from this the 19-23 Ranger doesn’t lose anything from its memory during a routine battery change except for the driver side window. The modules retain their memory.

 

[Glocker]

There are several modules that have volatile memory, so they would have to relearn, while it takes no action on your part for them to relearn, it's still a process that has to happen. Sometimes you may notice the transmission is not acting the same or you may notice nothing. To me it's worth maintaining all of that unless I have a reason to reset all of that as part of a process I'm following.

The Ford KAM memory isn't wiped when you disconnect the battery. To do that you have to go in and wipe it with a computer.

 

[theprinceofsnj]

I changed my battery a couple of years ago and what a pain. Did have reset the radio and driver's window. Next time I'm going to let someone else do it.

 

[ControlNode]

But they don’t, that’s what I’m saying. While an older vehicle might benefit from this the 19-23 Ranger doesn’t lose anything from its memory during a routine battery change except for the driver side window. The modules retain their memory.

You are incorrect or the factory service manual is, but I'll stick with information provided from Ford. The first note in the Battery Disconnect and Connect directions from the factory service manual: NOTE: When the battery is disconnected and connect, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven to allow the PCM to relearn the adaptive strategy values.

 

[Loweredon33s]

You are incorrect or the factory service manual is, but I'll stick with information provided from Ford. The first note in the Battery Disconnect and Connect directions from the factory service manual: NOTE: When the battery is disconnected and connect, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven to allow the PCM to relearn the adaptive strategy values.

A general statement not specific to the vehicle… yeah, I’d believe that too. I’ve only done it and seen what happens but that’s cool. I know I won’t be wasting my time at least.
Just a warning fyi, if you hook up a memory saver and accidentally ground the positive cable while fumbling around you might have a little more trouble than a fictitious memory loss.

 

[ControlNode]

A general statement not specific to the vehicle… yeah, I’d believe that too. I’ve only done it and seen what happens but that’s cool. I know I won’t be wasting my time at least.
Just a warning fyi, if you hook up a memory saver and accidentally ground the positive cable while fumbling around you might have a little more trouble than a fictitious memory loss.

I'm very aware of the risk of a memory saver. As I mentioned when I linked the cable I used, I stated you must be very careful not to ground the positive cable while it's disconnected. Back in the 90s when the memory savers were still fairly new, I worked in a garage that got one. I'm used to the safety needed to work with them.

I also think the amount of time the battery is disconnect may impact if the modules loss memory. They could have a capacitor that gives 15-20 minutes of memory time while the battery is disconnected. But when I do my own batteries, I use that time to clean and inspect that area of the engine bay and may end up removing a few more panels to get a better look at mounts or shift cables that are under there (other Ford, not the Ranger). My battery may be out for a few hours. Even in the NOTE of the FSM it states "may", and that may just depend on how long it is disconnected.

 

[Ranger_Rocks]

Using NVM would solve any memory loss issues.

I recently removed our 2019 Hyundai Santa Fe original battery in the evening, next day drove to town for the day, bought a new battery at Costco, installed it that evening. Everything appears to be working as before with nothing noticeable forgotten.

 

[ControlNode]

I recall some users on the Focus forums reporting that if some sensors were replaced and the person didn't have a scan tool to force a reset so the modules would start a clean relean they would disconnect the battery and short the positive cable to chassis ground (not shorting the battery, but the terminals while disconnected), some mentioned having a jumper wire they used with a resistor to slow the discharge. But the idea was you would quickly drain any voltage left in the vehicles modules and cause the memory to lose power and reset faster. But I don't recall seeing that in the manuals for the jobs on my cars I've needed to do. So, I just follow the FSM procedure.

 

[subquark]

I have an XL, so only radio presets and only the driver side window are affected.

The first time I disconnected the battery, I lost my presets and had to initialize the driver window.

The second time I disconnected the battery, I did not lose the presets but had to initialize the window.

Gremlins?

 

[Loweredon33s]

I have an XL, so only radio presets and only the driver side window are affected.

The first time I disconnected the battery, I lost my presets and had to initialize the driver window.

The second time I disconnected the battery, I did not lose the presets but had to initialize the window.

Gremlins?

Time

 

[ControlNode]

Time

12:01 AM and they just ate the wiring harness.

 

[airline tech]

As mentioned above (TIME) is the key factor.
Note there is NOT a detailed document as to how long - KAM will retain its memory with a battery disconnect.
Most general time frame = 15 minutes to 1 hour
Note: Adaptive Learning (INCLUDEDS) the transmissions tables.

My curiosity on this question had me attempt to find exact answers to this as well as finding out how long the battery had to be disconnected to drop all the Sync (Memory) Presets etc.
Never found a definitive answer.
Being that the - ONLY noted item that must be reset with a battery disconnect is the - One Touch Window (Control) - That requires human interaction. That switch is always powered via the BCM

Note: KAM is not completely wiped, the KAM reset only resets the LEARNED values (adjusted values) from stock default base values which will never be wiped unless you are tuning / reprogramming the PCM.

The only KAM reset - human interaction would be for the Idle Air Control (Learn) to aid in a fast learn of idle control. The rest is automatic and learns as you drive.
The various drive monitors (On-Borad) test cycles will also relearn when the conditions are met for them to run.

So, if simply replacing the battery (normal) time frame under 15 minutes the KAM should retain and the only thing you will need to do is the - One Touch Window (Reset) from the information (or lack of information) I can find in the manuals.
Sorry but there is no clear & precise answer to the question from the service manuals on this.

Note even the service manuals use the word (MAY)

 

[Beach]

Thanks for the reply. I'll bet you saved me some problems. Did you have to register the new battery?

For AGM batteries in certain vehicles, they require registration. Not sure about the Ranger but my BMW does. I got a good reconditioning charger and pulled that battery in in a 2016 bmw back up to full operation. Haven't ever replaced it

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