85 5000S fuel pump short?

[Huw Powell]

> > > And how would it show up as a short in the fuel
> > > pump circuit?
> >
> > The heater usually is hanging off the fuel pump
> > relay output.  So if it
> > shorts, or its wires get damaged and short out, Zap!
> > goes the fuel pump
> > relay current and voltage.
>
> Do you mean that the heater is fed
> by the exact same output terminal from the relay?

yes

> was testing the circuit by removing the relay and
> jumping a wire between the 2 wide blade terminals
> on the relay/fuse block. When the fuel pump is in fail
> mode, the wire shorts there...
> Do you know what the resistance of the O2 sensor
> heater is supposed to be?

a few ohms?  I forget.  Wait, I think it's about 20 ohms.  Warm or cold,
can't remember that though.

Just unplug it to test, next time.  It's more likely the fuel pump
anyway.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/