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80 ELECTRIC/ELECTRONIC SYSTEM D AILY E URO 4 In software, a function is present which is capable to rectify flow meter duration drift. In practice, while some manoeuvres (vehicle Where the central unit is replaced, on the contrary, flow meter rectification coefficients are to be copied down from old to new Replacing rail pressure sensor in hydraulic accumulator Rail pressure sensor can affect injector minimum flow rate correction accuracy, since minimum flow rate depends on both Replacing delta-p sensor During vehicle life time, the central unit makes some checks on filter differential pressure sensor drift, e.g., with engine stopped, So, some parameters are calculated and engine running values are consequently rectified. Replacing delta-p sensor involves resetting the rectifications. Replacing engine oil During vehicle life time, the central unit counts up the quantity of post-injected fuel in order to activate and maintain regeneration. A least fraction of this fuel (which is injected at a very long time after combustion, and consequently is not burning, i.e. is not The central unit is capable to calculate the limit quantity of fuel dissolved into oil and, consequently, to suggest oil refilling. It is obvious that, if after engine oil refilling the function is not reset, the central unit will keep on counting the increase of oil fraction |