Except it does it with Key Off.

 

Right. Missed that part

 

Yes, ECU thinks the FP relay is there because of the jumper wire.
Going to dig out the relay holder and the ignition control unit so I can see whats going on under them. Broken wire, short, etc.
Something for Monday. Will post findings asap.

 

It shuts off after 3 seconds.

 

This is a Renix system. Computer doesn't throw or store codes.
If it did that would make things easier by sending me in a general direction.
But then that's what a voltmeter helps with. Don't know which would be easier.

The titania o2 sensors do not produce a voltage like the newer Zerconia sensors. The titania (Pre 90"s Jeep), sensors are heated from battery voltage through the relay.
That's why, due to the drain on my battery with key off, I though the sensor I have been getting were of the Zerconia type.
But in reality I do have a wiring issue that's causing my battery drain.
http://tomco-inc.com/Tech_Tips/ttt20.pdf

 

Well that's a neat trick!

So the relay shuts down...

...except there's no relay.

Can you repeat that but listen to see if a relay clicks on or off? Perhaps the guy cannibalized one of the other relays (and that's a pretty short list) or put another one in someplace.

 

With o2 relay NOT installed and jumper sharing o2 and FP relay #85 terminal the FP relay does click.

 

Now I have bafflement because

 

I am trying to understand how the fuel pump could work without the relay, but the fuel pump relay socket appears to be behaving normally. I have concluded that it can't be done (me understanding, that is).

And the behavior when the O2 Relay is out seems a little inconsistent but maybe that's me, so let's hold on that for a minute.

These are 85 connectors but in the schematic they use the single digit nomenclature. Does the jumper connect GRY-YEL and ORG-T (2) or YEL and ORG (5)?

 

Because it seems to me that you cannot simultaneously get grounds and power. It would have to be either the 2 combination (grounds) or the 5 combination (power).

Great puzzle.

 

Are you confused because I made what seemed like a contradiction, or because of what this thing is doing?

I ran another test so I could make a summary.
Fuel pump relay out the fuel pump runs and the o2 relay clicks on then off.
o2 sensor out the fuel pump does not run but the fuel pump relay clicks on then off.
Both tests were with the jumper wire in place on 85 to 85.

This time I made a point to put my finger on each relay during the test.
What I found strange is that when the relays clicked on then off they made another single click. It's like they clicked on then off then on again and stayed on.

 

Can you confirm which wires are the 85s?

 

What this thing is doing is a contradiction.

 

According to the relays it is the 85 o2 relay to 85 FP relay
Sorry this pic is so large. Scroll down to see the jumper.

 

According to the diagram it looks like the jumper wire is connecting the grounds on each of the FP relay and the o2 relay.
Orange-T is ground from FP relay, (relay pin 85) to ECU
Grey-Yellow is ground from o2 relay, (relay pin 85) to ECU
And, the yellow goes from both relays (pin 86) to the ignition switch
Maybe there's a ground issue and ignition switch not allowing an interruption in the power to relay.
Tomorrow I will dig up the relay mount and the ignition module for a look-see.