Programming the close loop lambda function
This function is intended for light driving conditions and idle. It should be used to control exhaust emissions.
The Allowable Change parameter determines the maximum automatic fuel percentage adjustment allowed. This setting prevents the ECU form over-adjusting the fuel delivery if there is a lambda sensor failure.
The Operating Range parameter determines the vacuum range in which the close loop function will work. The range starts from minus 100 kPa and ends at the value set by this parameter. The closed loop control will turn off when the engine is above the selected vacuum (closer to zero) and start again once the engine vacuum goes below the selected level.
The Target A/F Ratio parameter sets the air fuel ratio you want to maintain. The ECU will automatically adjust the fuel delivery in order to achieve the selected target or is forced to stop when it reaches the allowable change limit.