EDIS-8 weird connection.

DEVONMAN · Post by **DEVONMAN** » Wed Jun 22, 2011 11:53 am

I recently got a used EDIS-8 box from the States complete with the VR crank sensor. Both had been snipped from the same car and the EDIS has the original connector with about 12" of tails. The crank sensor also has the original connector with about 12" of tails. (Blue wire ,Grey wire and screen).
When I bench tested the EDIS with the screened cable tails reconnected to the screened lead of the VR, it didn't work.
So I reversed the sensor wires and put the grey wire to the blue wire and the blue to the grey of the EDIS tails and then it worked.

Confused! any ideas.

Question, can a VR sensor change it's polarity somehow???

Cheers Denis

DaveEFI · Post by **DaveEFI** » Wed Jun 22, 2011 12:29 pm

No - it's essentially just a coil of wire.

I tried to find out which was which on the Ford type most sold in this country by the likes of Trigger Wheels and got definitive answers for both ways.

One of its terminals is marked '1'.

Most say to just try it both ways, and find out which is best, or which works.

I asked on the MS forum about a way of checking and got this reply:-

Re: EDIS VR sensor

Postby Heribert on Sun Sep 12, 2010 5:03 pm
Hi.
There is a pretty simple way that has served me well. You need a DVM set to 200 mV DC or a scope.
Connect the instrument to the VR sensor . Take a piece of soft iron and and let that sit on the sensor end.
Pull the iron off as fast as you can. The instrument shall swing towards a negative voltage , if not reverse the test
leads and repeat. The positive lead of the instrument that shows a negative deflection when pulling the piece of iron off
is now connected to the VR+ polarity as defined in EDIS parlance.
Heribert

DEVONMAN · Post by **DEVONMAN** » Wed Jun 22, 2011 12:48 pm

Dave, Thanks for the reply.

I have done the DVM test in the past to etablish the correct connection.

What I can't understand is how the Edis 8 worked in the vehicle it was snipped from where clearly blue was connected to blue and grey to grey.

cheers Denis

karlos01 · Post by **karlos01** » Wed Jun 22, 2011 3:05 pm

would it have anything to do with how its mounted? as in if it was bolted up one way round, it would work but the other way it would appear that the engine is running backwards?