Author Topic: iStop  (Read 1027 times)

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Offline sjpoole

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iStop
« on: December 10, 2018, 02:51:44 PM »
Hi to all, enjoying being the owner of a 2015 Mazda 3.
Can you tell me, does the iStop only start working when the engine is at full temperature ?

Should there be an indicator light on the iStop switch.

Many thanks................Steve

Offline StevenRB45

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Re: iStop
« Reply #1 on: December 11, 2018, 01:27:09 PM »
Not massively well versed in the i-stop system as used by Mazda but general principles would apply. Most systems have a surprisingly large number of parameters they look at when deciding if to operate stop start (e.g. the Citroen stop/start has 60!).

Coolant temp is most likely one of them.. along with battery charge/condition, current electrical load and the more obvious ones.

You then get to less obvious things..stuff like is the cabin temperature within 2 degrees of the selected temperature on the climate control? as an example don't know if Mazda uses that one..but Citroen do. If I remember correctly the gen 3 has an Istop display in the centre screen that tells you current system status at the bottom of the fuel economy monitor.

Don't know about the indicator light but plenty of gen 3 owners about sure one of those can confirm.

Offline Tall333

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Re: iStop
« Reply #2 on: December 11, 2018, 04:50:00 PM »
Hi to all, enjoying being the owner of a 2015 Mazda 3.
Can you tell me, does the iStop only start working when the engine is at full temperature ?

Should there be an indicator light on the iStop switch.
As per StevenRB45's advice, there are parameters to be met.  If you select the maintenance screen on the infotainment, then fuel economy monitor, one of these 3 screens shows icons with halos around them for engine, battery, and air con.  You might need to hide the banner at the screen bottom to see them.  All halos must be there for "ready" to be displayed, and for istop to work.

The engine needs to be not cold and battery charged.  Setting the heater to screen stops it from working, as does being stopped with the steering wheel slightly turned or being stopped (and holding it using the footbrake) but only pressing the footbrake lightly.

There's no indicator light on the switch, but if you hold the switch for a couple of secs it'll turn istop off, it'll beep and you get a yellow light on the dash.  Another long press turns it back on.

Offline bobmax

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istop?
« Reply #3 on: January 21, 2019, 09:29:50 PM »
I don't have a problem with istop.
Just wondering what's involved if it goes wrong etc?
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Offline StevenRB45

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Re: istop?
« Reply #4 on: January 22, 2019, 09:14:21 AM »
Without wishing to sound flippant, it would depend what is wrong with it.

Offline bobmax

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Re: istop?
« Reply #5 on: January 22, 2019, 10:35:19 AM »
I know it was a  daft question.
I was wondering what would happen if it failed to work, and what cost's are involved ;)
I don't know much about the workings etc.
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Offline bobmax

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Re: iStop
« Reply #6 on: January 22, 2019, 10:45:30 AM »
Alao, I found having the rear screen demister on stops it working.
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Offline StevenRB45

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Re: iStop
« Reply #7 on: January 22, 2019, 03:31:46 PM »
Rear screen will just be related to the power draw, the battery can't sustain it with the engine off.

Most stop start issues will fall under either a degraded battery stopping the system from activating and requiring a new one or a duff sensor.

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Re: iStop
« Reply #7 on: January 22, 2019, 03:31:46 PM »