"I just did the voltage check at the o2 sensor and got rapid movement between 2.5 and 6.5 volts."
>That sounds OK

"Then I followed the test proceedure suggested by Bruce Young. I got slow movement between .5 and .6 volts closed loop".
>Whoa! The test is done in Open Loop. If you were still in closed loop, there is no reason for the cycling to get slower. I'm confused.

"Then I unplugged the ecu wire and and did a full rich test. the o2 signal was a steady 1.1"
>Before you applied the 1.5 volt battery? Did the unplugged green ECU wire touch ground maybe? (An accidental "force Lean"?) That might explain the 1.1v

"and I applied the 1.5v battery to the green ecu wire and absolutly nothing happened."
>Also weird. Was it the + battery terminal? — and was the battery negative grounded? (I neglected to say that in the instructions, but will add it.)

"I then did the full lean test, grounding the green wire and again absolutly nothing happened and the o2 volts remained at 1.1"
>That's the correct Full Lean response — probably because it was already (erroneously) at 1.1 from something gone wrong with the Full Rich test, which should have brought the voltage way down.

But in any case, your closed loop cycling sounds like the sensor and ECU are OK. I would reset the code and see how it goes.

--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.