When this table is used
The EVAP solenoid controls how much fuel vapor from the charcoal canister gets drawn into the intake. On a Nexus, purge duty comes from one of two tables. This one, Duty Cycle (O2 Active), only comes into play once you have switched on O2 Control and the ECU is actively running in closed loop. The rest of the time, the O2 Inactive table takes over.
Why the values are usually higher
Canister vapor is extra fuel the ECU didn't meter through the injectors. In open loop, nothing corrects for it, so every bit of vapor makes the mixture richer. In closed loop, the O2 control sees the richer mixture and trims injector fuel back to compensate. That means the engine can take a lot more vapor without its air-fuel ratio wandering. So it's normal, and expected, for this table to carry larger duty values than the O2 Inactive table.
How we tune it
Raise purge duty gradually and watch your short-term fuel trims. Some pull-back while purging is fine. If trims are hitting their limits or idle quality suffers, you're purging too hard for the conditions. Start conservative, confirm in logs, and see the EVAP overview for the correction tables that trim this further.
