Autosport Labs

1st off just a quick hello from a newbie after reading through the insallation manual while waiting for my mjlj v4 coming i read i can set up the vr sensor and edis4 to get things working prior to it being connected.

Straight away i hit a problem as the engine in question is a 93' 1.8 silver top zetec which had a esc ford module fitted to get it working i found that if the mounting screws are not in the unit it will not run!!! is the esc/edis4 units earthed through the body of the module and as i'm utilising the std zetec vr sensor and zetec flywheel i know these are good because they were untouched from the original car and worked with the esc module (when screwed to the inner wing)

after trying to screw the edis 4 inplace of the esc module it still does not work??? i know it should but its just not coming up with the goods

any help greatly appreciated.

Gavin

Sounds like you have a but of a loose connection problem. I don't believe the units ground through the mounting bolts.

1) How did you reconnect the wires of the EDIS plug to the rest of the loom?? As there could be an intermitent connection problem.

2) Also how have you grounded the EDIS unit?? Do you have a good ground position??

3) Can you get a multimeter and with the EDIS plug disconnected, measure the resistance between either battery or chasis ground and the ground pin in the EDIS plug. Try wiggling the wires around and see if it breaks continuity.

4) It could also be the 12v supply wire so check you are always getting 12v with a multimeter, again wiggle the wires around a bit.

1, All the wires were soldered to ensure a good connection and most of the loom came from the same car so all the wires mated up colour for colour so they had to be rite?

2, The ground was the earth supply that the std coil was running same one as the esc module was using which is the std earth point on the car as it is a mk4 escort which comes with the module as std so the original edis mounting holes on the inner wing were utilised also.

3, I will be a few days before i can get to the car as its now in the ownership of someone else running the esc module originally fitted to keep it mobile, but i will indeed go over it all to check to see whats giving the correct outputs or not.

4, The wires supplying the power and earth to the module are the std 12v supply that normally feed the std coil that runs a dizzy.

I remember reading somewhere that you can run the edis module in limp mode as a temperary method of getting the car mobile so would have thought it would graft up straight away but this is what happend for me so thought i was wrong.

i do however have about 1/2 a dozen edis modules including various coil and vr sensor plugs so i will make another up to see if it was just a simple mistake on my behalf.

Q, if i make up a loom WITHOUT the vr sesor wire shielded will it still run as some of the older edis set ups had an unshielded wiring as std so would think this would be ok but not advisable??

GAT.

To answer your question, I have just use twisted pair wires running from my VR sensor to EDIS unit across the engine bay and never had a problem as yet. Just don't run it in a loom with other wires and try to avoid going near any high power/current wires such as ignition leads, cooling fan wires, should do the trick.

There is nothing wrong with running EDIS alone, in limp home mode. I would suggest doing this before connecting the mjlj in most new setups, keeps wiring errors to a minimum.

There shouldn't be a coil ground unless you mean its the ignition module ground. The original ignition module or ECU will ground the coil after every ignition event.

NITROPIXIE wrote:To answer your question, I have just use twisted pair wires running from my VR sensor to EDIS unit across the engine bay and never had a problem as yet. Just don't run it in a loom with other wires and try to avoid going near any high power/current wires such as ignition leads, cooling fan wires, should do the trick.

There is nothing wrong with running EDIS alone, in limp home mode. I would suggest doing this before connecting the mjlj in most new setups, keeps wiring errors to a minimum.

There shouldn't be a coil ground unless you mean its the ignition module ground. The original ignition module or ECU will ground the coil after every ignition event.

Sorry maybe i was not clear on this, what i should have said was the car was originally fitted with a 1.3 hcs carburettor engine with a standard coil and dizzy set up, what i utilised was the positive and negative that would other wise go to the std coil to run the original engine as it is lives up with the igintion turned on, this run the esc module i was running fine but when i fitted the home made loom with the edis4 module it would not give any signal to the coil pack to initiate a firing order but once i unplugged the edis 4 set up and plugged the std esc loom and module back in it started up straight away.

So it must be something i have done or be a faulty edis4 is all i can think of will have more answers soon as i'm going for round 2 soon.(ding,ding)

The ground side of your coil "power" most likely goes back to the tach as it drives it. You cannot use that as a ground source for Megajolt. You can however use the 12v feed to power Megajolt/EDIS, as it gets power from the ignition switch. I used that on mine through a relay to power mine.

DannyP wrote:The ground side of your coil "power" most likely goes back to the tach as it drives it. You cannot use that as a ground source for Megajolt. You can however use the 12v feed to power Megajolt/EDIS, as it gets power from the ignition switch. I used that on mine through a relay to power mine.

Well there is 3 wires that run the old coil set up, 1 wire is +12v while the other 2 are connected together as the earth one is a feedback wire for the rev counter whicle the other one is earth, as these wires are good enough to run the ESC module no problem why wont they run the EDIS ??? again i wont beable to gain access to the vehicle to put an end to problem till this weekend but i'm itching to get my hands on to put an end to this.

That's your problem there. The ground on the coil isn't a constant ground. Instead what happens is the ground side of the coil gets grounded and a magnetic field is produced within the coil, then a switch (whether electronic in an ignition module or points on a kettering system) breaks the circuit at the required ignition moment. The magnetic field collapses and basically discharges through the spark plug after the voltage is transformed up many times in the coil.

The tachometer sees the grounding of the points/ignition module and can workout rpm.

Hope this gives you more of an understanding. Just put the ground on its own ground wire to the chasis, obviously at the same point as the mjlj.

NITROPIXIE wrote:That's your problem there. The ground on the coil isn't a constant ground. Instead what happens is the ground side of the coil gets grounded and a magnetic field is produced within the coil, then a switch (whether electronic in an ignition module or points on a kettering system) breaks the circuit at the required ignition moment. The magnetic field collapses and basically discharges through the spark plug after the voltage is transformed up many times in the coil.

The tachometer sees the grounding of the points/ignition module and can workout rpm.

Hope this gives you more of an understanding. Just put the ground on its own ground wire to the chasis, obviously at the same point as the mjlj.

Rite so it looks like we got there in the end then but if that being the case why does the esc module work then??? now wheres a question maybe its internals are different that said mind i have 3 esc modules 2 would not work on this circuit but one would and the edis 4 i tried also would not work so maybe it was simply a fluke that one worked but if its getting a pulse signal i cant see it lasting to long???