following on from my thread in engines, i need a little help from the wiring/electrical gods.

i need to find out if i have a wiring fault on the lambda sensor circuit.

the wires do look in decent condition, but we all know the damage can be internal.

there are 4 wires, 3 go to the ecu and one goes to f11 in engine bay fusebox.

2 of the 3 that go to the ecu are pin 4 and 22 if the diagram i looked at was correct, so what pin does the third go to?

im planning on doing a continuity test on all 4 of the wires tomorrow from the ecu and fusebox, as well as measuring what readings i get from the other end. hopefully il be able to find something, if not its looking like ecu