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I'm trying to connect my ecu to the tach. I forgot to label the wire when I took it appart. Can anyone point me in the right direction? Is it on connector X-17 or X-25? I can't find it in the wiring diagrams.
And I did search first. Looks like there are multiple ways that people have tried. Y/Blue wire over by the ECU seems to be most common. A lot of these connectors are gone on my car though, does anyone know the Common Connector name of the yellow connector that has this wire in it?
Are you trying to get a crank position sensor signal? What exactly is this for?
Actual engine speed and rotor position is calculated based on the Ne and G sensors. Both those signals are needed if you were planning on sequential injection. I'm not sure what ECU you are using, but if you don't have a pretty good handle on how crank position is resolved and how ignition systems work you'll get really bogged down in figure it out.
Page Z-30 of the factory wiring diagram shows the tacho signal comes from pin 2B on the ECU and the wire is Yellow/Blue as you've said. The signal jumps over to page Z-42, where it passes through common connector X-15 before connecting to the dash cluster, shown on page Z-121. Careful, there appear to be two Yellow/Blue wires in connector X-15.
Arghx, I'm running an electromotive TEC Gt. it has a tach output wire, it was hooked up before I attempted the big re-wire, but I must have not labeled where it connected to and couldn't find where to hook it back up.
I'll go look at x15 and see if I can find the remains of the old tack out wire.