On the engine's catalytic converter there is a lambda oxygen sensor installed right after the exhaust turbo. This oxygen sensor is a broadband sensor which gives exact values across a wide measuring range. The measured value from the oxygen sensor and the measured air mass from HFM (hot filament air mass sensor) is used to determine a quantity mean value for all cylinders. This value is then compared to the injection quantity that is indicated in the engine control unit. If there is a difference the air mass is adapted to the actual quantity of fuel by adjusting the valve for the engine's exhaust recirculation in such a way that correct lambda value is set.
Restoring adaptation data for quantity mean value is a procedure for adjusting the fuel-air ratio correctly. This function does not affect any injectors individually.
This function must be run if any of the following components have been replaced.
HFM (hot filament air mass sensor).
Rail pressure sensor.
Test conditions:
Ignition on, engine off.
Procedure:
Start the function.
Adaptation data for quantity mean value is restored.
Function done.