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Old 01-11-2017, 09:22 PM   #1
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Left foot braking engine cut

I have rallied many years, autocrossed, rallycrossed, and iced crossed VWs for many years and recently picked up a 2013 Focus and want to take it out on the ice. However while screwing around in the snow I am getting a mild engine cut while left foot braking which can be a real problem while pushing a car on loose surfaces haha. I have the traction control, abs, and yaw switched so that should not be the issue. Do these cars have a safety cut out? If so can I just inplug the brake sensor? I know the tail lights will also be unfunctional so I am trying to wait for a closed track to try that but someone has to know.
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Old 01-11-2017, 09:28 PM   #2
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These cars don't let you actually have fun. You never really disable the stability control and the car will pull power to correct itself anytime you slide.

Really, really super frustrating. Also kind of fun when you power into a turn way too fast and the car corrects itself. Just have to remember my other cars don't do it.

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Old 01-11-2017, 09:43 PM   #3
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You can disable that correction with one fuse under the hood, I pulled it and replaced it with a inline fuses switch so I can turn it on and off from inside the car. It does light the dash up like a Christmas tree though! But I still can't get the lfb engine cut figures out.

http://www.focusfanatics.com/forum/d...ge=2&_k=izzf28
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Old 01-11-2017, 10:15 PM   #4
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I'll go along with the first response, but add a bit.

My GUESS is that you can disable most of the nanny system by turning off ABS systems at the fuse, but the throttle cut functions of stability Control wouldn't be affected - as proven by your experiment.

Maybe tracing down the yaw sensor to disconnect it would be the answer to defeating that system entirely. (usually in the rear of the car over the rear axle area)
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Old 01-11-2017, 11:21 PM   #5
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Thanks I may have missed understood the first response. I will look into the stability wiring in the rear. To that point though the throttle cut also happens when going perfectly straight on dry roads as well though, I still think there may be more too it. We have a race this weekend and I will start unplugging sensors until something works I hope.
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Old 01-12-2017, 04:38 AM   #6
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There is a Brake-over-accelerator monitor in the PCM. Not sure how it would behave with the brake switch jumped out, but you can try. I would imagine it goes into limp mode if it doesn't like it.
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Old 01-12-2017, 11:34 PM   #7
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Anyone ever unplugged the speed sensor so the computer never knows you are going over 35mph which would disable the BOA? Not sure what else would be effected.
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Old 01-12-2017, 11:36 PM   #8
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Oh sheet - didn't think of the Toyota fallout for extra "safeties".
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Old 01-19-2017, 08:23 AM   #9
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The speed sensor usually inputs in for the engine load too, unplugging that might be a mistake.

I would have made a guess at this too.........

'There is a Brake-over-accelerator monitor in the PCM.'
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Old 01-19-2017, 10:28 AM   #10
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Thanks for the response. Yeah I don't like the idea of unplugging the VSS sensor either, that one has a lot of potential to screw things up.

I did pull the brake sensor and that worked fine but no tail lights which was ok for time trial stuff. Also, this needs to be tested more as the track we ran was very tight and speeds were not regularly over 35 so there may still be problems but they were masked by the slow speeds. Not sure.

I will look into the PCM and see what can be toyed with there.

Wish it just had the button you could hold down like on the trucks. Then you can just turn it all off at will like it should be.
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