Primary Identification (PID) Reference Chart Mode 01

Open = Open loop, have not satisfied conditions for closed loop.

Closed = Closed loop using O2S(s) as feedback for fuel control.

OP DRV = Open loop due to due to driving conditions (heavy acceleration)

OP SYS = Open loop due to vehicle system fault. CL O2S = Closed loop fuel control, but fault with O2S sensor(s).