• Join Premium & Save
      Join Premium & Save
    • Huge Range of Ford Parts
      Huge Range of Ford Parts
    • Savings Up to 15% Off For Members
      Savings Up to 15% Off For Members
    • 1000's Of Fords For Sale
      1000's Of Fords For Sale
    • Get Your Club gear
      Get Your Club gear
    • Share Your Car Experience
      Share Your Car Experience


Tommo17

Focus mk3 stop start not working

Recommended Posts

Hi my stop start has stopped working. On the test menu it shows my battery as 11.4v with everything off. Is that healthy enough for the system to work. Done a 20minute trip down the motorway last weekend and had everything off as approaching the city and it still didn't activate. Anyone else had same issue. Or know a fix. 

 

Thanks

Share this post


Link to post
Share on other sites
 

I know mine is reluctant to enter s/s if I have the air con on...

11.4v is a flat battery mate so sounds like your monitoring system is out of whack.

There is a procedure for resetting it involving pushing of buttons which might help. @iantt has posted about it before but I'll be buggered if I can find it...

Edit:

Here is what Ian put in another thread so Kudos to him if it solves your problem:

Ron, if you want to have a go at reseting battery monitoring, just do as follows

Ign on for 10 secs, press rear foglighr switch 5 times, press hazzard switch 3 times, wait 10 secs. Battery light flashes. Ign off

use car, and see if thst fixes

Full thread here so you can go and thank him! Lol!

 

Share this post


Link to post
Share on other sites
7 hours ago, Phil21185 said:

I know mine is reluctant to enter s/s if I have the air con on...

11.4v is a flat battery mate so sounds like your monitoring system is out of whack.

There is a procedure for resetting it involving pushing of buttons which might help. @iantt has posted about it before but I'll be buggered if I can find it...

Edit:

Here is what Ian put in another thread so Kudos to him if it solves your problem:

Ron, if you want to have a go at reseting battery monitoring, just do as follows

Ign on for 10 secs, press rear foglighr switch 5 times, press hazzard switch 3 times, wait 10 secs. Battery light flashes. Ign off

use car, and see if thst fixes

Full thread here so you can go and thank him! Lol!

 

I will give that a try. And give that thread a good read  

 

thanks

 

Share this post


Link to post
Share on other sites

Hope it helps.

Edit: interestingly my car reads 11.7 with just the ignition on and as I say, mine is very reluctant to use s/s if the air con is on. 

I used Ian's procedure successfully (the battery light flashed) and the dish still says 11.7v so will have to see 

Share this post


Link to post
Share on other sites

Mine hadn't worked for about 6 months until I went on holiday to Cornwall. Whilst there it started working and worked several times every day for two weeks. Now it doesn't work again.

The smart charging system tries to keep the battery charged to 80%. The stop/start needs the battery to be above a certain charge level or it won't work. My battery usually shows 11.4v on the diagnostic display with the engine not running.

My theory is that the hills in Cornwall allowed the regenerative charging system to charge the battery to more than 80% and that caused the stop/start system to work for a while. Now I am back in Lincolnshire and all journeys are on flat ground the battery has dropped back to 80% charge and stop/start no longer works.

 

Share this post


Link to post
Share on other sites

Thanks. Will get a smart battery charger and reset the battery monitor and see if that helps. Not got any trips planned more than a few mile lol

Share this post


Link to post
Share on other sites

The smart charging system is built into the car which is why you should never jump start it! 

Hmm I wonder what the voltage reads at the terminals then? Time to get my multimeter out.

Lincolnshire shout out by the way!

Share this post


Link to post
Share on other sites

When you turn the ignition on, all the car services are live, and you will be drawing a fair amount of current. You should test the battery with a multimeter across the battery terminals on the 20V scale.  Anything below about 12.5 is starting to be cause for concern for a car that's been left overnight.  When you start the car the starter motor give the battery a big hit with possibly 40-50 Amps drain., if your battery doesn't regularly show 12.7, it's on its way out.  Modern batteries quite often will appear ok, until the morning you need to start the car urgently!

Share this post


Link to post
Share on other sites
8 minutes ago, Guzzilazz said:

When you turn the ignition on, all the car services are live, and you will be drawing a fair amount of current. You should test the battery with a multimeter across the battery terminals on the 20V scale.  Anything below about 12.5 is starting to be cause for concern for a car that's been left overnight.  When you start the car the starter motor give the battery a big hit with possibly 40-50 Amps drain., if your battery doesn't regularly show 12.7, it's on its way out.  Modern batteries quite often will appear ok, until the morning you need to start the car urgently!

Thanks for that. I'll get my meter out tonight and report back what it is at the terminals. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now