[Diy_efi] Sending unit confusion

[Toyota Supra]

ok, just to be clear, this sounds like you want me to do this in place of 
the sending unit, is there a way to make the sending unit work outside of 
the car, but putting 12vDC into the yellow wire, and then putting something 
on the other side of the second wire (brown with black)?

the particular reason this appeals to me, is i can then move the float up 
and down, and watch it turn the circuit on, and turn it off, as well as 
visually see how much travel the float has to make, before overcoming the 
hysteresis.

if not, i'll pick up a 55k pot today, the manual says that it should read 0 
to 55k when functioning properly

thanks perry

-j






From: Perry Harrington <pedward at apsoft.com>

>Subject: Re: [Diy_efi] Sending unit confusion

>
>Measure the highest resistance of the sending unit, then substitute a pot 
>of
>the same general value.  Just use 2 poles of the pot and leave the 3rd pole
>unconnected.
>
>--Perry
>
>On Thu, Feb 20, 2003 at 03:12:35PM -0500, Toyota Supra wrote:
> > 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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