The Dyno ‘I Want To Do Donuts’ Plug … ?

[WD Pro]

So I am assuming most people know about the dyno plug on the inner fender near the air box - but how much do we actually know about this plug ?

Due to other issues (thanks Ford …) I had my air box out at weekend and took the opportunity to neaten up the rather messy tape / conduit / wiring that’s on the end of the dyno plug.

When I stripped it down, the loom side up to the plug contains four wires / four terminals, but after the plug there is only one wire that simply loops back connecting two of the terminals.

So if unplugging this connections removes all the nannies but also disables the ABS and triggers a dash light, what else was designed to plug into this connection to make use of all four wires and terminals ?

I’m just interested really, it’s not like I have any great plans for it – but I would like to know …

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[WD Pro]

Correction to the above.

It would appear that pulling the plug does NOT turn off ABS (that will teach me for believing what I read on here ... ).

Confirmation of the ABS still remaining functional with the plug pulled can be found here :

https://www.mustang6g.com/forums/threads/can-you-really-turn-off-traction-control.165971/

I've updated this thread so I don't upset anyone by regurgitating false information ...

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[raptor17GT]

i know mine is a MY17 but the dyno guy just turned off the traction control from the cabin, no unplugging wires in the engine bay. Now, whether he used the trac button on the dash or his laptop to turn something off via OBDC connection I have no idea. I drive with the nannies on but dyno wise, no unplugging cables were required.

 

[WildHorse]

It would appear that pulling the plug does NOT turn off ABS (that will teach me for believing what I read on here

But now you lost 2 critical equations for the ABS to be truly effective:

1. steering angle. No longer takes steering angle measurements. it goes to default (redundancy).
2. Front/rear braking bias. It goes to default (redundancy).

 

[Mike Pfeifer]

Steering angle and front / rear bias is getting into stability control, no? To me ABS was simply about locking the brakes or not at any given wheel.

 

[WildHorse]

To me ABS was simply about locking the brakes or not at any given wheel.

Welcome to modern ABS systems, pulling that plug effectively reduces it to 80's tech. I spent 45 minutes reading up on it at my buddies shop.

 

[Mike Pfeifer]

Right, that’s kinda what im saying. The only data point needed to make ABS work is wheel speed. But it’s splitting hairs, trying to tell where ABS ends and stability control starts.

It’s interesting that this even exists, reminds me of the plug you pull to disable the high voltage system on a BMW (and I’m sure other manufacturers) EV or plug-in hybrid so you can work on it safely. Makes me wonder why Ford would put it on the car, maybe a request from the performance division?

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