I stop not working

[macdougal]

Appreciate this has been discussed a few times in these forums but just wanted to get the latest opinions.
Cx3 2.0L auto. I stop appears to have stopped working. Following prev advice, made sure everything else (fans, air con etc) turned off and this always seemed to work. Now nothing, I stop refusing to play ball. Car is not getting used as much recently only 2 or 3 times a week. Is this something to do with it? (Battery charge status). Also wondering if the cold could be affecting it, or a combination of both of the above?

[jtonline]

Latest opinions haven't changed. Amongst a whole host of other required conditions, as I understand it the:

• Battery state of charge condition must be 65.7% or more
• Battery fluid temperature must be 0—70 °C {32—158 °F}
• Battery voltage must be 11.2 V or more
• Engine coolant temperature must be 30—110 °C {86—230 °F}

Cold weather affects the condition of the battery, particularly if it's old.

[st3v3cx-3]

Appreciate this has been discussed a few times in these forums but just wanted to get the latest opinions.
Cx3 2.0L auto. I stop appears to have stopped working. Following prev advice, made sure everything else (fans, air con etc) turned off and this always seemed to work. Now nothing, I stop refusing to play ball. Car is not getting used as much recently only 2 or 3 times a week. Is this something to do with it? (Battery charge status). Also wondering if the cold could be affecting it, or a combination of both of the above?

I my experience it's always the battery charge condition that prevents the i-stop working, once the engine is warmed up sufficiently of course. I always have the air con on so that never seems to come into the equation. Have you checked the status of the 3 elements - engine temp, battery and ac - in the Fuel Economy display? Think you'll find it's the battery icon that won't have the blue glow around it, signifying it isn't sufficiently charged, that is preventing i-stop being ready. This is likely to be the main problem in cold winter conditions particularly when a car isn't used daily. This is what I find, despite leaving the car in a garage where it is partially sheltered from the cold.

[Percy247]

If you have a trickle/normal battery charger then charge the battery overnight and check if the istop works the next day once warmed up etc.

[lhcmazda]

No guarantee that charging the battery will get the istop to work, I purchased a very expensive battery charger specifically designed for Stop / Start car operation, and it made no difference the iStop, still has a mind of it's own and operates as and when it likes. As Julian says there are a lot of parameters which have to be met to enable it's consistent operation of the istop facility.

[Percy247]

Check the screen in the fuel economy app. Look for the 3 icons in the bottom right corner. For Istop to work, all 3 most have a blue glow. Engine icon glows when up to temp and dpf not regerating. Battery icon glows when voltage is sufficient. A/C icon glows when A/C is off and fan is either off or low. I find that having the fan at the level I want disables the istop.

[HouseSpider]

No guarantee that charging the battery will get the istop to work, I purchased a very expensive battery charger specifically designed for Stop / Start car operation, and it made no difference the iStop, still has a mind of it's own and operates as and when it likes. As Julian says there are a lot of parameters which have to be met to enable it's consistent operation of the istop facility.

An expensive battery charger won't mend a old dilapidated battery. I bought one with a reconditioning option which didn't work on my 5 yo battery. The only option was to get a new battery. I-stop then started to work properly again, and continues to do so in this cold weather.

However having the fan on demist (max) still disables i-stop.

[lhcmazda]

I agree I was only stating that by charging the battery it doesn't mean that the istop will work, there are as I mentioned many parameters which have to be met to enable the istop operation.