B11: Signal Ground 1 Continuity

With EM010 and EM014 disconnected, measure the resistance between EM010/023 and chassis ground EM008L.

Is the resistance < 0.5 ohms?

Yes
GO to B12, B12: Signal Ground 2 Continuity

No
Inspect connector EM010 for corrosion, damage, or pushed back pins.
Inspect earthing stud EM008L for corrosion.
Inspect harness, splice EMS36.
Repair as required and reconnect plug(s).
GO to B13, B13: Check For Heated O2 Sensor Continuity