C8: O2 Sensor Screen Ground Continuity

With EM012 and EM022 disconnected, measure the resistance between EM012/022 and EM022/001.

Is the resistance < 0.5 ohms?

Yes
GO to C9, C9: O2 Sensor Short Circuit to Ground

No
Inspect harness/connectors EM012 and EM022 for corrosion, damaged/pushed back pins.
Inspect harness/splice EMS08 for damage. Repair as necessary and reconnect plug(s).
GO to C10, C10: Stop