2025 PP CX-5 Cylinder Deactivation Question

[SurfDoggie]

Just bought a new 2025 this past saturday. Love the car, but it doesnt seem to me CDA is working. I had the CDA turned off by the sales rep for the test drive. Now that I have been driving a few days it has occured to me that it should be reactivating every time I restart the car? I have noted while at stops the Tack stays just under 1k which leads me to believe its not working as it should? Im new to the car and come from a 2017 GT that did not have CDA so I have no idea if this is something I should look into or if its fine. Personally not a fan of CDA and don't want to try and "Fix" it if its not broken?

 

[stickerbush]

Your sales rep was feeding you a line...CD cannot be turned off and on.

There is a screen in the infotainment system that has a graphic showing the 4 cylinders and which if any are deactivated.

 

[hsdejong]

I'm not sure about the exact distance, but CDA is not active during the first 100 km (65 mi) of a new CX-5.

 

[paris1]

You should not notice CDA in day-to-day driving. It's pretty damn seamless unless (maybe) you have a sixth sense about things mechanical. I didn't like the idea of my wife's '23 having it either, but I have to admit I never think about it in use.

 

[SurfDoggie]

Thanks for all the responses! I retested and it seems I am not pushing the break down far enough to activate it. DOH! So it is working as expected. Stickerbush mentioned there was no way to turn it off? The sales guy showed me a specific button on the lower left of the dash, by TCS on/off. I will have to check that out and see if I can in fact disable it per driving session.

 

[SurfDoggie]

I'm not sure about the exact distance, but CDA is not active during the first 100 km (65 mi) of a new CX-5.

My first car with CDA so I retested. I was not pushing the break peddle down far enough to activate CDA. Car only has 50 mi and CDA working as expected, user error

 

[RedBaron]

It sounds like you are talking about iStop, rather than Cylinder Deactivation. iStop has a button to disable and activates (stops the engine) when you come to a stop and press the brake firmly enough.

 

[wlong01]

It sounds like you are talking about iStop, rather than Cylinder Deactivation. iStop has a button to disable and activates (stops the engine) when you come to a stop and press the brake firmly enough.

I think you hit the nail on the head. CD doesn't activate until you hit cruise speed and you cant deactivate it. You can deactivate I-Stop but you have to do it each time you start the car.

 

[SurfDoggie]

It sounds like you are talking about iStop, rather than Cylinder Deactivation. iStop has a button to disable and activates (stops the engine) when you come to a stop and press the brake firmly enough.

You are correct, I have confused the two. I was talking about iStop. Thank you! I guess it would be helpful if I actually asked the right questions.

 

[SurfDoggie]

Your sales rep was feeding you a line...CD cannot be turned off and on.

There is a screen in the infotainment system that has a graphic showing the 4 cylinders and which if any are deactivated.

Thanks, RedBarron pointed out that I was actually asking about i-Stop and confusing the two. I didnt think iStop was working as expected. Turns out the non-issue was user error. I was not depressing the brake far enough to activate it.

 

[Moonlighter]

Thanks, RedBarron pointed out that I was actually asking about i-Stop and confusing the two. I didnt think iStop was working as expected. Turns out the non-issue was user error. I was not depressing the brake far enough to activate it.

Yes indeed, the brake has to be quite firmly pressed to allow iStop to activate. And there are a number of other conditions that also have to be met for it to activate. Eg sufficient battery charge, A/C not on max, ambient temp, steering wheel straight, and some others.

And if for some reason you dont want it to activate when the car is stopped, holding the car stopped with light pressure on the brake pedal is the way to do it. You will quickly learn.

I have had CX5’s with iStop since 2014. Never once in that time have I had an issue with it restarting.

Mazda’s implementation of the stop/start system is among the best, if not THE best, of all manufacturers. You may have read that their system cleverly stops the engine at TDC and uses the spark to assist the restarting process, thereby reducing the load on the starting motor.

Some friends with new Mazdas that have never had a stop/start have been worried about how quickly it restarts should they need to make a quick getaway.

I say to them - try this - stop the car so that iStop activates. Now, get someone to say “GO!” and then as fast as you can, take your foot off the brake and onto the accelerator.

I bet that the engine is running and ready to go by the time your foot is pushing the accelerator down. And it always is.

So really, its all a mindset thing and you just need to get used to it.

 

[SurfDoggie]

Mazda’s implementation of the stop/start system is among the best, if not THE best, of all manufacturers. You may have read that their system cleverly stops the engine at TDC and uses the spark to assist the restarting process, thereby reducing the load on the starting motor.

No I did not know, Thanks! All of these are good to know. I am really loving Mazda's iStop implementation. I did not know about the other conditions that need to be met. That's especially good to know. Ive been driving the car more than reading the manual. I need to catch up on my reading.

 

[paris1]

Mazda’s implementation of the stop/start system is among the best, if not THE best, of all manufacturers. You may have read that their system cleverly stops the engine at TDC and uses the spark to assist the restarting process, thereby reducing the load on the starting motor.

That's pretty much the way all these systems work. The BEST ones tend to be part of a some variation of a hybrid system wherein the battery and motor combination play a part in the restart, taking the load off the 12V system and providing more "umph" to restart the engine.

 

[hsdejong]

Start-Stop technology in depth:

 

[hsdejong]

The BEST ones tend to be part of a some variation of a hybrid system wherein the battery and motor combination play a part in the restart, taking the load off the 12V system and providing more "umph" to restart the engine.

In Mild Hybrid Mazdas the engine is restarting from an i-stop using the 24V lithium-ion battery in combination with the integrated starter generator, rather than the starter motor which is used to cold start the engine, and is very smooth.

 

[Moonlighter]

Mazda’s implementation of the stop/start system is among the best, if not THE best, of all manufacturers. You may have read that their system cleverly stops the engine at TDC and uses the spark to assist the restarting process, thereby reducing the load on the starting motor.

That's pretty much the way all these systems work. The BEST ones tend to be part of a some variation of a hybrid system wherein the battery and motor combination play a part in the restart, taking the load off the 12V system and providing more "umph" to restart the engine.

Which other non-hybrid car manufacturers ie models with only an ICE, uses spark assist to restart after stop/start system has activated?

 

[N7turbo]

I thought that information was disputed? I remember reading a past discussion on this where the information on Mazda's website regarding i-Stop was in question.

 

[Moonlighter]

I thought that information was disputed? I remember reading a past discussion on this where the information on Mazda's website regarding i-Stop was in question.

Save fuel your vehicle uses with Mazda's idling stop technology - Passport Mazda Blog

i-stop is a smart technology that saves fuel by switching off the engine when the car stops. Idling stop systems save fuel by automatically shutting down the engine when the vehicle is static and restarting it when the vehicle returns to motion. i-stop Mazda’s i-stop substantially improves fuel...

www.passportmazda.com

 

[N7turbo]

Here is that discussion (I think it's the one I'm remembering). The dispute was regarding the statements made on that page that the system does not use the starter.

Post in thread 'Start/Stop on CX-5' 2017~2025 - Start/Stop on CX-5

 

[Moonlighter]

There is a lot of speculation and some incorrect info in that thread, basically its mostly speculation predominantly from US based members where from the comments, it apparently wasnt even available at the time.

By contrast, its been pretty much standard across the majority of the Mazda range here in Australia, certainly since 2014 when I got my first CX5 2.2 diesel and its been on both diesel and ULP models here since then. So we (including me) have lots of experience with it.

It works exactly as I said on CX5, which of course has a standard NA engine, and is not a hybrid. Its starter is spark/compression assisted. Requires a EFB.

Mazda had put out videos about it at the time.

Mazda’s implementation in that context is right at the front of the pack. Seamless.

I think I heard back then that BMW might have used a similar method but their own design.

But Im not aware of any other ICE non hybrid car that has the same method, there certainly weren’t when Mazda introduced it, there was a lot of fanfare and amazed automotive journalists reporting about it back then.

By now there could be other examples out there, I just havent been bothered to search the topic lately.

How hybrid stop/start systems do it is irrelevant.