FUEL SYSTEM B1 (Fuel system status)

Air / fuel ratio feedback loop status displayed as one of the following.

OPEN:  Open loop-has not yet satisfied conditions to go closed loop.

CLOSED:  Closed loop-using oxygen sensor(s) as feedback for fuel control.

OPEN-DRIVE COND:  Open loop due to driving conditions (Power enrichment, etc.).

OPEN SYS FAULT:  Open loop due to detected system fault.

CLOSED-ONE O2S:  Closed loop, but fault with at least one oxygen sensor-may be using single oxygen sensor for fuel control.