Cylinder Deactivation Questions

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None
Mazda's video in the link below states that "in light-load driving situations, such as cruising on the highway, Mazda's new engine shuts down two cylinders to save fuel."

https://insidemazda.mazdausa.com/the-mazda-way/technology/mazdas-new-cylinder-deactivation/

1. Does cylinder deactivation also occur when the engine is idling and the car is not moving?

2. Or does cd only occur at "cruising speeds" whatever that means? I assume "cruising speed" means any steady speed with no acceleration, right? What if the speed is 75 mph? I would think two cylinders wouldn't be enough at 75 mph?

3. Is there a CD indicator lamp on the dashboard that indicates whether the engine is running on 2 or 4 cylinders?

4. Do the turbo models have cd?
 

ColoradoDriver

Gen-1 Kodo Design
Contributor
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Denver, CO
:
2014 CX-5 Touring
1. No
2. Cruising speeds meaning between 25-50 MPH if I recall correctly.
3. Not that I am aware of.
4. No
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg
Contributor
:
Plano, Texas, USA
Mazda CX-5's cylinder deactivation operates only at sustained cruising speed between 25 mph and 50 mph (40 km/h to 80 km/h).

And:
Cylinder deactivation is more effective at low speeds, improving fuel economy by some 20% when driving at a constant 40 km/h, and by about 5% at a constant 80 km/h.

Currently there're a couple of Service Alerts by Mazda concerning rocker arm falling off issue from cylinder deactivation:

Dangerous cylinder deactivation trouble on 2018 CX-5 and 6 models
 
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Denmark
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CX-3 Optimum Aut.
On the new 2019 Mazda 6 in Europe, you can see cd activation in the economy app (where you also can see i-stop details).
 

alexeyga

Member
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CX-5 2016.5
FOUR cylinders are just barely enough at 75.

That's my experience as well - the poor 2.5 at "cruising" speeds is already borderline-choking... and yet, some moron had a brilliant idea of handicapping it by half...

I'd pay to see the durability stats on these engines, especially closer to the end of the warranty coverage.
 

PetesCX5

Member
:
2015 Mazda, CX-5, Touring
1. No
2. Cruising speeds meaning between 25-50 MPH if I recall correctly.
3. Not that I am aware of.
4. No
Have heard that the turbo 2.5 does not have CD. Considering a 2019 or 2020 with the 2.5T and AWD. Where can I find info on what CX-5 engines do not have CD? Also does the turbo have that "fulcrum" thing in the torque converter like the non turbos do? Any other issues with the 2019 - 2020 CX-5 2.5T AWD?
 
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2017 CX-5 GS AWD
All years of the turbo do not have CD. The 2018 and later 2.5 NA, have CD. The 2017 and older 2.5 NA, DO NOT have CD.
 
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2018 CX-5 Sport
...I would think two cylinders wouldn't be enough at 75 mph?
I think CD will kick in even at 75mph if you don't need to give it much gas, such as when going down an incline. The car will never try to accelerate or fight a head wind with two cylinders, CD is for almost no load driving.