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My MPGuino is not working - ECU hookup?
Topic Started: May 24 2009, 05:38 PM (769 Views)
rmcelwee
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I just got my new MPGuino straight from opengauge.org in the mail a couple of days ago. I hooked it up to my '93 Geo Metro Convt today and I am seeing 999 MPG instant. I believe I used the default setup on everything with the exception of vehicle weight (I think I put something in like 1600 or so). Anyway, if I am driving 35 MPH and go to screen #1 it shows:
9999/"working MPH"
9999/"working distance"

If I go to screen #8 it shows:
1.4/G0000000 (never changes)
1.4/G0000000 (never changes)

Can anyone help me troubleshoot this thing?

I have the unit hooked straight to the ECU (well, using the wiring harness at the ECU). I was tol that sometimes this doesn't work but I cannot figure out why hooking it up at the ECU vs hooking it up at the injector could cause a problem. You can see my install here (work in progress):
http://www.lightweightmiata.com/geo/mpguino/

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wikityler
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Some say...

Sounds like it's not getting the injector signal, thus the high millage. I don't suppose you have a logic probe or a 'scope?
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rmcelwee
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Hooking up straight to the injector fixed it. I am not sure why I couldn't get it to work using the wire at the ECU. I will investigate this further when I get a chance. For now, I am going to start rebuilding the engine so I won't have time to play with it for a while.
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