Diagnostic Overview
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To cover a long time fuel system shift in lean or rich direction the closed loop controller and the closed loop long term adaptations will be observed by a diagnostic strategy.
The strategy is split in two different parts, whereby one part is monitoring if the closed loop controller reaches its limit (rich or lean) - Closed loop controller diagnostic. The other part is monitoring if the closed loop system long term adaptation reaches its limit (rich or lean) - Closed loop adaptation diagnostic.
In both strategies a timer will start as soon as the limit is reached. After the timer has expired and the limit is still reached, a malfunction will be set.