Deckman001
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posted on 19/4/23 at 05:38 PM |
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Zetec using an ESC ecu and a Durite tacho - issues
So Am having a slight issue with my winter upgrades.
The engine is a 1.8 zetec blacktop running on a ford ESC ecu wired up with a Premier loom which says to use a green/red wire of the ecu to connect to
the light green of the tacho/premier loom. It is all connected up but the tacho isn't moving at all. I have heard that diodes might be needed to
resolve this but I can't find a definitive answer, anyone else had to resolve this issue and could give me some advice?
Jason
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obfripper
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posted on 19/4/23 at 06:29 PM |
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The esc tacho output is a 12v square wave, the durite tacho is looking for the back emf spike from a coil operation, the 12v square wave is not the
right waveform to trigger this.
The linked diagram gives a schematic to emulate this output using the esc tacho output, only the coil part of the relay is needed, the internal
diode/resistor and contacts need to be removed.
Another approach is to use diodes as per the following diagram, this will definitely work but needs to be added into your loom.
![](/galpreviews/EDIS_tach.gif) ![tachometer diodes](/gallery/EDIS_tach.gif) tachometer diodes
Dave
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Deckman001
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posted on 19/4/23 at 07:21 PM |
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Hi Dave, your reply is awesome !!! Many many thanks, your reply has also been responded as by someone else so it sounds perfect.
Thanks again
Jason
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