You could be rich, lean, or at stochiometric ideal. Basic mixture setpoint is a mechanical adjustment, and EHA compensation works either way. Enrichment and fuel shutoff conditions can't be met without loop control in a KE system, though, but the ECU may still respond to the airflow meter potentiometer, which will provide enrichment information. Other inputs likely still active are altitude compensation, cold start valve (O2 sensor not active until warm anyway), and temperature sensors.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7