johnH20
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| posted on 28/10/12 at 07:59 PM |
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Tacho pulse from Ford EDIS
I am sure many have done this. I am using an ETB Digidash 2 that calls for a signal from the negative coil terminal. From my Ford TIS I cannot work
out which this is. Any advice appreciated.
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rb968
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| posted on 28/10/12 at 08:15 PM |
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There are some details on the megasquirt manual that might help.
Sorry cant be of more use than that but do need to cross this bridge myself in the next week!
http://www.megamanual.com/ms2/EDIS.htm
Rich
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scudderfish
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| posted on 28/10/12 at 08:43 PM |
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If it wants a feed from the coil, it's looking from a big spike (IIRC 70+v) which the EDIS doesn't produce. You can rig up a coil
simulator by using the coil in a relay, but you end up with a mad buzzing behind the dash that even my V8 couldn't drown out. I ended up
swapping my tacho for one that worked with EDIS/ECU rather than coil.
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snapper
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| posted on 29/10/12 at 06:32 AM |
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3 diodes 1 each from the coil pack driver feeds joined to 1 Zener diode which goes to the dash
Megajolt forum autosportslabs has a diagram
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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snapper
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| posted on 29/10/12 at 06:45 AM |
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I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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old_timbo
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| posted on 29/10/12 at 11:38 PM |
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I needed to drive a Smiths electric rev. counter (ex-Triumph Dolomite) from an EDIS driven by Megasquirt. I tried the diode / zener circuit which
worked below about 3500 rpm but dead above. In the end the penny dropped that the PIP signal from the 4 cylinder EDIS is a nice 12vdc square wave at 4
pulses per rev. I was worried that the rev. counter would drag this down and cause other problems but I just T'd into it and everything works
fine. Should be able to do the same with the feed to the Digi dash.
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johnH20
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| posted on 7/11/12 at 11:01 PM |
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Hi old-timbo, Finally got round to calling ETB today. Recommendation was to T off either outer wire to EDIS. These look like the connections to the (
std ) ECU ( pins 52 and 26 in my case ). Does this sound correct to you ?. What is PIP?
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old_timbo
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| posted on 7/11/12 at 11:34 PM |
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As Rich advises, take a look at this page in the Megamanual. http://www.megamanual.com/ms2/EDIS.htm It has a couple of good diagrams
amongst a load of other stuff that gives the info you need. The PIP is on the wire that goes to terminal 1 on the EDIS connector and is Tach in to MS.
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johnH20
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| posted on 8/11/12 at 07:30 PM |
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Hi Old-timbo. Many thanks, a very interesting read. I fear I may have misdescribed my problem in my original post. I am using an EEC V ECU and do not
have a separate EDIS module ( at least any that I have found yet! ) so I suspect the clever stuff is all done in the EEC. I have 3 wires into my coil
pack ( unless that has a brain too ) and is one of these I need
to to take my tacho feed from, I think. Perhaps Wasa or Mad Inventions on here or anyone else using an EEC V could confirm.
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