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Old 11th June 2021, 16:43   #11
macafee2
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Originally Posted by itcaptainslow View Post
Exactly that-the ECU will look at the state of the battery (and ignore the voltage from the alternator, which will probably be a smart charge one and therefore the voltage from this will be variable anyway) and disable the stop start unless all of the “checklist is ticked.

If it’s a dealer replacement the battery will most probably be correct for the car as they’ll pick the one listed on the EPC but if you source one yourself check it’s the correct Enhanced Cyclic Mat or Absorbent Glass Mat battery for the car-also check it doesn’t need programming in using diagnostic software (quite a few do now, which is an absolute pain!). Most motor factors can source these quite happily now.

Might be worth giving it a go on the aforementioned battery conditioner before replacing though to see if this helps-if the car is subjected to regular short journeys (which it sounds like it is?) this won’t be helping it.

Modern car tech is amazing when it works but an utter pain when it causes issues!

yes car does short journeys at the moment, silly short.
Hopefully in a few weeks they will be longer.
Wife has ordered battery From Ford and haggling has got it with £30 off and they will fit and reprogram.

Apart from a multi meter I have no other test equipment but perhaps I may get the old battery tested. Internet suggests stop start batteries last about 4 years so it is due a change.

I dont feel comfortable her having battery changed until I understand it more but at the moment our lives do not afford us a lot of time to investigate.

I will be "cheesed off" if a new battery does not cure the problem. I have a feeling there would be no payment for the batter if it did not cure the problem
They made a mistake with pricing, should have been £80 to diagnose but quoted £30 so charged £30. Come to the forum and could get a lot more done for a lot less. Those of you that know what you are doing could make a fortune running diagnostic testing


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Old 11th June 2021, 16:48   #12
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Originally Posted by macafee2 View Post
The stop start function on the wife's focus has stopped working.
Dealer is saying battery has had it.
Looking at the internet it suggests having a dealer fit a new battery as diy can lead to electronic problems, what do you know of this?

Also, if the car starts ok, she drives to the shops, she stops the car does what ever then starts it again and drives to next shop and so on and each time the car starts why does the stop start not stop? Surly there is enough guts in the battery to start the car as the wife is able to start it.

confused wit nagging doubt that battery is duff but it could be due to only knowing about old type of technology

macafee2
yes, we have a Mondeo at work and the stop-start stopped working ages ago, because it was annoying anyway we never bothered getting it investigated. Then during lockdown over winter, because the car wasn't getting much use the battery packed up. Having had a new battery fitted the stop-start works now, so guessed it was related to the battery that disabled it in the first place.
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Old 11th June 2021, 17:15   #13
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Originally Posted by macafee2 View Post
yes car does short journeys at the moment, silly short.
Hopefully in a few weeks they will be longer.
Wife has ordered battery From Ford and haggling has got it with £30 off and they will fit and reprogram.

Apart from a multi meter I have no other test equipment but perhaps I may get the old battery tested. Internet suggests stop start batteries last about 4 years so it is due a change.

I dont feel comfortable her having battery changed until I understand it more but at the moment our lives do not afford us a lot of time to investigate.

I will be "cheesed off" if a new battery does not cure the problem. I have a feeling there would be no payment for the batter if it did not cure the problem
They made a mistake with pricing, should have been £80 to diagnose but quoted £30 so charged £30. Come to the forum and could get a lot more done for a lot less. Those of you that know what you are doing could make a fortune running diagnostic testing


macafee2
Unfortunately diagnosing modern car issues has followed the complexity of the modern car-CANBUS and the myriad of interconnected ECU’s & sensors has made fault finding a tricky job, especially for intermittent issues, and a job which the general public don’t often appreciate. A good master/consultant tech in a dealership or marque specialist will most often be educated to degree level and beyond and the scope & cost of the equipment used is beyond most DIY’ers or even independents now, unfortunately.

Dealerships can appear to be rip off in their prices (and are when they don’t deliver the value for money in heightened levels of service-I’ve had atrocious experiences at dealerships which I’m only too happy to call out), but this training, equipment, posh building, the new courtesy cars and coffee have to be paid for somehow. It’s when they don’t live up to the premium pricing is when people have a right to feel aggrieved.

Whilst your car is doing those short journeys definitely get it on a battery conditioner-it’s not a diesel, is it…? As if so these short trips will definitely have a negative impact on the DPF.
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Old 11th June 2021, 17:48   #14
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Originally Posted by itcaptainslow View Post
Unfortunately diagnosing modern car issues has followed the complexity of the modern car-CANBUS and the myriad of interconnected ECU’s & sensors has made fault finding a tricky job, especially for intermittent issues, and a job which the general public don’t often appreciate. A good master/consultant tech in a dealership or marque specialist will most often be educated to degree level and beyond and the scope & cost of the equipment used is beyond most DIY’ers or even independents now, unfortunately.

Dealerships can appear to be rip off in their prices (and are when they don’t deliver the value for money in heightened levels of service-I’ve had atrocious experiences at dealerships which I’m only too happy to call out), but this training, equipment, posh building, the new courtesy cars and coffee have to be paid for somehow. It’s when they don’t live up to the premium pricing is when people have a right to feel aggrieved.

Whilst your car is doing those short journeys definitely get it on a battery conditioner-it’s not a diesel, is it…? As if so these short trips will definitely have a negative impact on the DPF.
every now and then the car is taken for a blast to try and take care of the DPF. No not a diesel, the car is a petrol

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Old 11th June 2021, 17:56   #15
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every now and then the car is taken for a blast to try and take care of the DPF. No not a diesel, the car is a petrol

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Petrol ???? Did not think Petrol engines had a DPF (Diesel Particulate Filter)
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Old 11th June 2021, 18:17   #16
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Petrol ???? Did not think Petrol engines had a DPF (Diesel Particulate Filter)
Ppf or Gpf, but they shouldn't need the same treatment as a dpf as petrol engines warm up quicker than a diesel - so I have read recently.

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Old 12th June 2021, 17:46   #17
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Ppf or Gpf, but they shouldn't need the same treatment as a dpf as petrol engines warm up quicker than a diesel - so I have read recently.

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Depending on how new macafee’s car is, I doubt it’ll have a GPF-they’re a fairly recent (two to three years from memory? I could be wrong here) addition to petrol vehicles and thus one I don’t know too much about, as they came about after I left the motor industry.
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Old 12th June 2021, 19:16   #18
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Depending on how new macafee’s car is, I doubt it’ll have a GPF-they’re a fairly recent (two to three years from memory? I could be wrong here) addition to petrol vehicles and thus one I don’t know too much about, as they came about after I left the motor industry.
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Old 12th June 2021, 21:17   #19
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There is a procedure for resetting the battery monitoring system. It’s a sequence of ignition on and pressing the fog light switch and hazard light switch a number of times. If you google it you will find plenty of information on it.

This resets the battery monitoring system and may get the stop start working again.

If that doesn’t work, it could be time for a new battery and maybe using the car more often to keep on top of the battery health.

I have a 2017 Focus and occasionally my stop start won’t work if the car has sat for a couple of days and I’m running air con etc. It’s perfectly normal for the stop start not to operate unless the car has all criteria met, such as battery state, ambient temp, engine temp, electrical load such as heating, air con, etc, etc...

It’s an intelligent system and if it decides it’s best not to shut the engine down - then it won’t.

Last edited by Mean & Green; 12th June 2021 at 21:23..
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Old 12th June 2021, 21:46   #20
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Originally Posted by COLVERT View Post
Voltage drop you say.
The moment the engine is running there WILL BE 14 volts plus in the cars electrical system.---

Don't tell me that won't enable the system immediately.

CO2 saving you say. Think of that rubbish next time you stop behind a lorry or look up into the sky to a monstrous passenger plane flying by over your head.------Zillions of CO2 dropping straight down on top of you and your family, if you have one.---It's a con and it DOES make money for the dealers in replacement spare parts and batteries etc.

You, my man, have successfully been conned.--They've got you, hook line and sinker.----- Now go stand in the corner and repeat to yourself---I will try not to believe everything I'm told in future without first having a good think about it.


Nobody it going to tell you their system is rubbish, and in addition to buying the car you are going to have to buy a charger cos their invention can't cope on its own.--( see an earlier post. )



The voltage put out by the alternator is not what the stop start system is looking at. The battery voltage without help from the alternator is what it’s looking at. Along with whatever load is being put onto the electrical system, such as heating, lights, wipers, air con and so on.

A battery may well start the car well enough under more regular circumstances, such as at the very start of a journey until manually switching the car off. However if the battery isn’t healthy enough to carry out repeated start ups particularly on a short run - then the car will decide not to activate stop start. This is to protect the battery and help keep things running as they should.

This contradicts your theory that it’s a ploy to make money as if they were just looking to do that, they’d design the car to just continually keep doing restarts until the battery can’t take the load anymore and fail.

In most cases the problem is people using cars for ridiculously short journeys which doesn’t charge the battery properly. Journeys where their own two legs or two legs plus two wheels could easily take them, which would further help with CO2, but that’s another subject.

Cars and car batteries like to be used for decent runs, that’s the only problem here.
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