These parameters control closed loop operation.
Closed Loop
Disable closed loop while tuning, otherwise the ECU will adjust the air/fuel ratio resulting in an inconsistent air/fuel ratio.
Disable P1167 and P0134 DTCs for race vehicles without a primary oxygen sensor. Do not disable these DTCs if the primary o2 sensor is present.
P0135 (European ECUs only) - disable this error if running without an o2 sensor.
Secondary oxygen sensor - disable the secondary o2 sensor is not present.
Maximum Map for closed loop - this determines the maximum engine load for closed loop.
Disable fuel over-run cutoff delay - this disables the 0.5 second delay between closing the throttle and the fuel injectors being shut down under over-run conditions. Disable this if you experience a hesitating while shifting with large injectors or see the short term fuel trim go sharply negative while shifting.
Closed Loop Settings
The minimum and maximum short term adjustment sets the limits for the short term fuel trim. The values are expressed as a percentage adjustment of fuel eg. -10% means that the short term fuel trim will not remove more than 10% fuel from the table.
Use secondary 02 input for closed loop operation - uses the oxygen sensor connected to the secondary o2 sensor pin as the primary oxygen sensor for closed loop operation (PRA only).