E15: Check For Short to B+

With EM010 and EM012 disconnected, measure the voltage between EM010/023 and EM012/022.

Is the voltage 0 (zero) V?

Yes
GO to E16, E16: Check For Short to B+ At O2 Sensor Heater

No
Inspect harness/connectors EM010, EM012 and EM023 for corrosion, damaged/pushed back pins.
Repair as required and reconnect plug(s).
GO to E18, E18: End