- Sat Jul 18, 2020 9:15 pm
#44301
Hello everyone, Im having a bit of trouble with getting my tacho to work on my 1988 Toyota Starlet.
It has a gauge cluster installed out of a 1988 (i think) Toyota Starlet Turbo S (EP71)
The tacho has worked on the stock distributor but ever since installing my Core4 speeduino unit it hasnt.
The stock signal comes from a sensor in the distribitor that makes a signal specificly for the tacho. before installing Everything I measured this with a scope and it seems to be a 12V signal. it was a bit weird shaped though. almost like its 12v for a few miliseconds, then 5v for about 2 times as long, then ground. but i assume a regular 12v square wave would work.
The current setup is a Core 4 like i said before, it has its tacho jumper soldered to 12v and today i measured the signal with my scope, and it gives a nice 6ms long 12v square wave the 6ms being set in tunerstudio.
Its possible that 6ms is too short but I cant set it any higher so I assume I shouldnt have to.
Im not running the distributor anymore since im using wasted spark coils now. those are mounted realy nicely in the location of the stock dizzy so it would suck to have to change that back.
Ive also measured the wire between te ecu and the gauge cluster for continuity and it measured 0.4ohm which is fine I think since it goes through 3 connectors.
when turning on the ignition I can see the tacho needle move a little (like its turning on or something) but after that pretty much nothing.
in a few weeks I think Il be measuring the signal of of another starlet with a similar distributor to compare.
I hope someone can give me some ideas as to what to do.
it would realy suck if I couldnt use it since the tacho clusters are fairly rare and pretty cool imo.
Thanks in advance,
-Gary
It has a gauge cluster installed out of a 1988 (i think) Toyota Starlet Turbo S (EP71)
The tacho has worked on the stock distributor but ever since installing my Core4 speeduino unit it hasnt.
The stock signal comes from a sensor in the distribitor that makes a signal specificly for the tacho. before installing Everything I measured this with a scope and it seems to be a 12V signal. it was a bit weird shaped though. almost like its 12v for a few miliseconds, then 5v for about 2 times as long, then ground. but i assume a regular 12v square wave would work.
The current setup is a Core 4 like i said before, it has its tacho jumper soldered to 12v and today i measured the signal with my scope, and it gives a nice 6ms long 12v square wave the 6ms being set in tunerstudio.
Its possible that 6ms is too short but I cant set it any higher so I assume I shouldnt have to.
Im not running the distributor anymore since im using wasted spark coils now. those are mounted realy nicely in the location of the stock dizzy so it would suck to have to change that back.
Ive also measured the wire between te ecu and the gauge cluster for continuity and it measured 0.4ohm which is fine I think since it goes through 3 connectors.
when turning on the ignition I can see the tacho needle move a little (like its turning on or something) but after that pretty much nothing.
in a few weeks I think Il be measuring the signal of of another starlet with a similar distributor to compare.
I hope someone can give me some ideas as to what to do.
it would realy suck if I couldnt use it since the tacho clusters are fairly rare and pretty cool imo.
Thanks in advance,
-Gary