2020 GT Cylinder Deactivation App View

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L
GA prior 16 CX5 GT
V
20 CX5 GT + Prem
My 2020 GT Premium has a screen in the Mileage Application that displays the Cylinder Deactivation Status. Even at 70 mph when you go down a hill it turns the light off #1 and #4. If the hill is steep it will eventually turn off the light on all 4 cylinders I guess with a fuel cut off. At the bottom of the hill all four lights come back on at the same time. The story of CD working only under 40 mph does not seem to apply to this model. It is also getting about 2 mpg better with a new tight engine vs my old 2016 GT that has 60,000 miles on it. I am unable to detect when CD is active except by looking at the screen. So far so good...
 

yrwei52

2016 Mazda CX-5 GT AWD w/Tech Pkg. Plano, TX
Contributor
My 2020 GT Premium has a screen in the Mileage Application that displays the Cylinder Deactivation Status. Even at 70 mph when you go down a hill it turns the light off #1 and #4. If the hill is steep it will eventually turn off the light on all 4 cylinders I guess with a fuel cut off. At the bottom of the hill all four lights come back on at the same time. The story of CD working only under 40 mph does not seem to apply to this model. It is also getting about 2 mpg better with a new tight engine vs my old 2016 GT that has 60,000 miles on it. I am unable to detect when CD is active except by looking at the screen. So far so good...
Thanks for observation on cylinder deactivation of your new 2020 Mazda CX-5 GT Premium. So there’s a CD app on 2020 CX-5 2.5L which will help the driver to know the status of the CD. IMO Mazda may have reprogrammed the CD activation criteria for newer MY’s but doesn’t provide updated info to the consumers.

Or the observation you had is only designed for engine brake with CD during down-hill. I guess you can try to observe if the CD would be activated during the highway cruising speed above 50 mph on flat surface. And when cylinders deactivated on designed cylinder #1 and #4, the operation is different from “turning off” the cylinder #2 and #3 as the valves on cylinder #2 and #3 will never be kept closed during their “deactivation” period.
 
L
GA prior 16 CX5 GT
V
20 CX5 GT + Prem
At idle I have not seen it in CD yet, you may be hearing AC compressor kicking in or something else?
 
V
CX5 GT +pp 2018
Its the rpm and torque that matters not speed. We discussed it few times in the past, there is a diagram for the range.

Also after the pcm update I noticed aprox 2 to 3 mpg better during CD-enabled consitions on my 2018.
 
V
CX5 GT +pp 2018
may be infotainment update..since its pcm controlled although I dont remember seeing any option for cd exposed in the infotainment linux parameters that I saw when exploring aio...
...who knows..

Gaxibm, what is your version of the infotainment on the 2020?

Thanks.
 

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