[Diy_efi] Sending unit confusion

[Toyota Supra]

that makes sense, so it measures the current loss, it is sending 12vDC out, 
but after grounding or whatever, only receives 0 to 3.5vDC ?

so, how can i simulate what is in the car? can i measure resistance between 
the brown w/ black wire, and ground, and then use that resitor between my 
inverters ground and that particular wire? as well as running 12vDC into the 
yellow wire?

thanks for the help perry

-j









>Subject: Re: [Diy_efi] Sending unit confusion

>
>The sending unit may be connected like a temp sensor.  The sender has
>a bias resistor between ground and the input.  12v is supplied to the
>input of the sender and the output pulls the voltage up or down through
>the bias resistor.  If the sending unit isn't grounded, then with 2
>wires it has to be biased externally.
>
>--Perry
>




> > >
> > > > in my never ending quest to conquer this circuit, i have encountered
> > > > something very strange. when i removed the fuel level sending unit 
>to
> > >try
> > > > and test my circuit, i found that i am not able to simulate its
> > >electrical
> > > > function.
> > > > the sending unit has 2 wires, a yellow and a brown w/ black tracer. 
>when
> > >the
> > > > sending unit is not plugged into the body harness, the yellow wire 
>has
> > > > +12vDC (or whatever battery voltage may be) on the body harness side 
>of
> > >the
> > > > connector, and the brown w/ black tracer has approximately 15k of
> > >resistance
> > > > to ground, or 35mV of positive voltage.
> > > >
> > > > when the connectors are plugged in, the yellow wire will have 
>anywhere
> > >from
> > > > 0 to 3.5vDC, dependent on the position of the "float". the variable
> > >resistor
> > > > will have resistance ranging from 0k to 55k.
> > > >
> > > > now, my problem is, i can't simulate the variable voltage outside of 
>the
> > > > vehicle, to test my circuit. if i put 12vDC into the yellow wire, 
>the
> > >brown
> > > > w/ black tracer will also have 12vDC, so what could that wire 
>possibly
> > >be
> > > > doing, or connected to, that would make the circuit and unit work
> > >properly?
> > > >
> > >


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