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Old 04-26-2012, 08:21 PM   #1 (permalink)
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Officially need help - 95 Saturn settings

Ok, I had a few threads here, but now need official 'how to hookup' help.
I have a 95 Saturn SL1 (pre-obdII). I installed a mpguino and can't get it to work for me. First off, the power supply is good, the speed input is good. My problem is reading the injectors.

I read on Saturn fans that the computer switches the grounds for the injectors to control pulses. I have 2 wires connected to each injector. I tested each of these wires and can pull 12 volts from each with the key on/engine off. With key on/engine on at idle, it read 14 volts at each wire on the multimeter. I read on Saturnfans that one color wire runs straight from the fuse box and the other is from the ECU.

So I wired the mpguino injector input to the 'non fuse box' wire - I tried some of the settings and just can't get it to read an estimated fuel usage for me.

Anyone with a 95 Saturn get this to work?
Is it a lost cause on this car?

Thanks for ANY suggestions!


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Old 04-27-2012, 12:05 AM   #2 (permalink)
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If it's like the Metro (and my Nissans) you need to use the side of the injector that is switched to ground by the ECU as that is the signal that is changing.

One side of the injector is fed +12V (or whatever the battery voltage is), and the other side is grounded by the ecu.

1992 Geo Metro, 1.0L 5spd, 435,000 miles on the original engine and trans!
- knuckles/hubs/brakes/13" wheels from a 2000 Metro
- running 175 70R13
- averaging 51.7 MPG, 56.9MPG best tank.
- self built MPGuino
- http://www.dschmidt.com/MPGuinoJBD.html
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