Using An ECM Memory Saver When Changing A Battery
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- เผยแพร่เมื่อ 11 ก.ย. 2017
- In this video I discuss the advantages of using a memory saver device when battery service is done and thus preventing loss of saved memory and subsequent performance related issues as result. I show my preferred method of retaining memory by using an OBD memory saver cord.
Here's a cord available from wise tools for about $20: wiseautotools.com/BPESA30-Memo...
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this is the story of my life with my 04 imprezza!! it does my head in!!
I enjoyed the information about IAC's. I didn't realize that.
Blessings to you friend
Thanks for the tip Doc!
sure thing. hope it helps
Interesting. Would this work for the Audi Q7 where they say you HAVE TO get the battery registered to the vehicle?
Good tip Tim. Nissans are like that too. I bet there's a lot of brands that wig out now if you disconnect the battery.
Good call. I meant to mention others as well. Dodge caravans, chevy trailblazers, etc.
good to learn new things. thank you.
You bet. Take care
In my case I have to effect a repair on a lumbar adjuster on a 2010 Terrain dr. seat.
Is it sufficient to remove the SIR fuses only before fixing the lumbar mechanism?
Whenever I do airbag work I don't use the memory saver because it is just taking the place of the battery. So you still have the same charge as if the battery is connected. Still a safety issue. What I do instead of that and/or disconnecting the battery is pull the fuse for the airbag system if there is one. It does the same thing as disconnecting the battery but only for the airbags.
Good call. I usually disconnect the airbag connectors when possible or just disconnect the battery and struggle through the relearn. Most times not a huge deal. Thanks for dropping in!
Yeah. I always disconnect the airbag connectors as well. Can't be to safe. Those things hurt when they hit ya.
Thanks Tim , you the man
Thank you for watching my vids.
It would take some custom application depending on the particular car, but I would think avoiding use of power thru the OBD port is the best approach because of potential to draw too many amps or make a hookup mistake causing arcing and damage to the PCM/ECM. I would use jumpers attached to the positive and negative battery cables with eyelet connectors so the hook up cannot come loose like simple alligator style clamps could do. Wrap them with a rag to prevent incidental shorting while removing and reinstalling the battery. Any unexpected high load would then not be detrimental to the computers or any small gauge wiring.
Yes i agree specially new model car. They end up blowing there fuses by using the power thru the OBD.👍
Hello Tim. I need a little help. I have a 300A Harbor Freight jump pack and I have a 4ft schumacher SAC-109 12v male to male. I want to open my trunk on a 2001 Jetta, which is electronically controlled. Battery is out of the vehicle. I want to connect the male + male to the jump pack, and to the cigarette lighter in the car. I'm a little scared about damaging any (computer) components. Should I just be safe, and connect the jump pack to the dangling battery cables?
2 handy tools to have!
Indeed. Cheap and handy
Good video, I was just thinking about this today because I was going to disconnect my battery and I did mint want to have to reset the monitors.
I do recall also seeing that you can buy or make your own 9 volt power source and plug it right into the cigarette lighter. Which if I remember gives you a short window frame.
With the plug you show, I'm sure you would have a lot more time.
As long as the OBD port and cig lighter are on the same circuit that will work but you better work fast!
Also, if your cigarette lighter is only hot when ignition is keyed on, this won't work. Lots of new cars are set up this way.
excellent thanks
should you use this on all cars with a obd connector I have a 2004 Mitsubishi.
If the bad battery is at 11 volts and the assisting battery is at 14.6 volts. Isn't there a danger of overloading the OBD circuitry and cables due to the voltage difference?
Great video I would just like to add one thing a friend of mine did this and turned on the box before he plugged it into the OBD2 port anyway he ended up frying the ECM because it wasn't fully connected and some arcing went on so I would say plug it in first and then turn on the power
Oh good call, but since I plug it in before disconnecting the battery I cant believe there is any type of amperage spike but who knows. better safe than sorry. Thanks for the input.
hello doctor good tool we used at work all the time . cheeeers
Thanks, what type of work do you guys do?
TIM,hi i work at a shop we fix all kind of cars and we use that tool it is handy some times. cheeeeers
Good info and interesting. I recently read that cars today have a small battery backup to retain computer data for when the car battery needs to be disconnected. Is there something to this?
I have not run into this yet but sounds like a good idea. I don't see the latest year model vehicles until they run out of warranty so it might just be something I haven't seen in the shop yet. Thank you for checking out my vid!
Thats a nice and simple way to keep the computers volitile memory alive :-D
Now we just need a device to help retain my memory
Hey, i want date stamps on memory so i dont keep thinking events were a couple of years back, actually 30 years back lol.
When the adaptor is plugged in to the diagnosis port, is it necessary to have the ignition switch in the on position ??
No, you want to leave the ign off.
@@ThecardoctorTV this is where I am confused. Another video says to turn ignition to on. Can you please confirm?
Useful tool to have
yeppers. its cheap and saves a lot of time having. Blessings
I have a 2010 fusion, and the owners manual says do not use a memory saver if disconnecting the battery.
Wow, that's a first for me but there must be a reason. Ill have to look into that
my windows in my 1993 ford explorer won't go up or down, i told a friend if he could check the wires in between the door to see if any wires were broken he said that could not be the problem because the motor for the windows still works. Do you think the wires could be the problem even if the motor for the windows still works. I don't know what to do, I love your channel and thought you would know, thank you for any help. Sorry for the long explanation
Yes the wires are probably broken in the drivers door jamb area.
ok i will check thank you
Is there a part number on the OBD2 from Napa
im sure there is but I cant find it. sorry bout that
So you can plug into another cars cig lighter?
yes
why not hook up jumper cables from a good battery to the wire terminals coming from the battery before unhooking the battery that you are going to replace - the PCM will not see any interruption of the 12 v supply
that works!
@@ThecardoctorTV It would work but it seems to me that the jumper cables would get in the way of disconnecting the battery. If you accidentally knock them off you've lost the memory. This set up is out of the way so no chance for an shucks.
When AAA came out to replace my battery he kept the car running during the entire process.. What are your thouhhts on this? Thx Dr
On a modern car it's a good way to kill the PCM
Yes theres a lot that can go wrong there. Probably not a good idea.
This is so dangerous and some automotive cannot stay running without a battery, also when you remove the cables u have anywhere from 80-180 amps that can ark and do more damages
Hi
Sorry för my bad English.
Is it a memory saver or is it a memory holder?
or memory maker?
can you make another video where you actually demonstrate what you're talking about? People go to TH-cam because they need to SEE how things are done, etc.
I want to learn memory automotive ...plz help me
buy a cheap chinise b.o.b. you need one anyways 50 bucks hook up scope to it also
Is that why they put that thing on your finger in the hospital...it's a memory saver :D
yes and when the Doc inserts his finger somewhere its called a memory maker
HAHA you got that right!!
For the love of god... Do you have any electrical background man? Do you have any idea what you are powering up through that obd port?
The wire running to the obd connector of the car is way too thin to support this type of thing. Depending ot the car and it's wiring you could be powering all of its electronics from there. That's ok if the car is in sleep mode, but an open door could cause all of the dome lights to be powered through the thin wire in the obd port. Fact check - I've done repairs on burnt obd connector wires from such stupid ideas.
If you do not want to lose your memory, your best ber is connecting an auxilary battery to the main battery terminals or the car's main fuse... But hey, I suppose thats way too advanced...
Jut following manufacturer recommendations.
What a tool
@@ThecardoctorTV I agree, not enough load to cause a problem. You're not going to try to start the car and drive it with this set up.
That video is very misleading. An ECM does not have to relearn the idle and settings because that software was initially loaded into the ecm before it was even installed on the car. Now your ready monitors have to reset YES but as far as your timing and idle that software remains even if you remove the ecm from the car and place on a shelf for a year
Tons of modern cars are a nightmare if you don’t use a memory saver. Toyota in particular
default settings is what you are referring to...those settings may remain as you say, but as the vehicle is operated over time the PCM relearns new settings based on operational factors of the vehicle which includes wear and a variety of other factors that change the engine from its new/original performance levels. Short periods of battery power loss generally do not scramble your electronic memory so a lot of people just do a quick job of the battery change and have no problem. But if the battery disconnect exceeds the critical time then you lose the newly learned settings and revert to the original default settings. Given enough time most vehicles will relearn the adjusted settings, but in that time frame you may have some pretty rough running engines and irregular shift patterns in the transmission, even some accessory irregularities like air conditioning performance.
@@garymcmullin2292 Hello Gary. That is all fable Gary. I will tell you why. The way a person operates a car or the wear pattern of an engine CANNOT alter the software in any ECM. Your belief would be based on how an engine ran could somehow change the software in a transistor ecm. That software is one way and one way only. A so called rough running engine could develop another wear pattern however that would mathc the ecm software. What youre saying has the art of sounding intelligent, but any illogic can be designed to sound accurate. Now some ecms can actually have software that distorts and becomes disactive due to lack of good grounding or electrical surge, but a flash of the motor companies original software can be programmed back into an ecm unless there are inner damages in the ecm. No software on any computer or anything can adjust to a user or an engine ever as it can only do what it was designed to do. Your email software cannot readjust your computer settings in a note book computer
Part 2 of my reasons are of that. If an engine runs rough as you say, no ecm is going to re learn, but it will only cause (based on the accurate software) a pending or active code in which will require repair of the engine in order that the engine will comply in its running order to the ecms software.
@@garymcmullin2292 No Gary. You believe in fiction. One set of software is in a pcm /ecm and nothing else can be learned by a PCM as you say. If an engine runs any different than the software can enact to in an ecm, then it will show a default code, until the person repairs the engine to conform to the software in the ecm transistor unit. An ecm will NEVER learn as you say to conform to an engine, but the engine must conform to the software. If the engine isnt running based on the timing in the software or firing order or fuel pressure or mis firing, its a fact it will only do what the software is designed to do and that is to CAUSE A PENDING CODE AND IF NOT REPAIRED AS FOR AS THE ENGINE THEN AN ENGINE LIGHT APPEARS MEANING THE CODE IS ACTIVE. Everything in your comment is total garbage Gary. An engine must run in the way the software is programmed in the ecm and if it does not it will show a CODE.
I have a 2004 Infiniti g35 replaced the battery and lost the memory on the stereo, power windows , power seats and when you started the car it would die at idle until you gave it gas but just at start up. The brain lost the idle memory and it took about 100 miles for the idle to adjust and all was good . I used one of these to change the battery recently everything was perfect afterwards, depending on make model and year .if you dont use a memory keeper you will lose your memory and have problems .