85 5000S fuel pump short?

[Huw Powell]

> What is an oxygen sensor HEATER (doesn't the exhaust
> gas do that very quickly?)? Where is it?

Usually when the OXS is not right in the exhaust manifold, it will have
a heater element built in, to speed up its getting to temperature.

> 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.

The plug for the heater is one of those typical 2 pin Amp types (black),
usually right next to the single wire plug for the OXS signal.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/