Need help figuring out my tack problem.

[cWs306]

Hey everyone, title says most of it.. my speedo gauge isnt working.. it was working before but sometimes when id say... take a long or hard left turn at a higher speed.. it would cut out, but then when i straightened out or jerked it to the right it would kick back on.. and now it wont come on at all.. been driving with rpms for a week now.. HELP! idunno where to start, dont wanna start tearing into stuff if i dont need to. oh and before it would also do a little fluctuating sometimes. between my speed and 0. thanks for the tips. later

[wytbishop]

The most obvious possibilities are a) electrical short somewhere in the circuit, or b) faulty speedo drive.

b) is easy. a) is not.

Go to a junk yard and find a similar MX-3 (RS and GS have different speedo drives) and try replacing the speedo drive that goes into the top of the differential. That will cost $10 and be pretty easy to do.

If that doesn't work you will have to trace the wires in this diagram...

http://www.mx-3.com/manuals/showimg.php ... /Z-058.gif

Use a multimeter to find the short. don't know what year yours is. The wire colors may not be the same but the circuit should not be different from this.

[cWs306]

its a 94. my little tag thinger majiger says it

[wytbishop]

Well I imagine that the wire colors on a 94' are probably the same as 95' but they might not be. Either way the circuit itself will not likely have changed. Look at that diagram and you'll see that there are only 4 wires in the speed circuit. 2 from the speedo sensor (on the diff), one main power from the ignition switch and one from the ECU. If it's not the speedo sensor it pretty much has to be a bad wire.

I suppose the speedometer itself could be faulty as well but I would try the others first.