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When the assumed PM accumulation reaches the specified level, the engine-ECU automatically
carries out the DPF regeneration and always keeps the DPF optimal state. When the DPF regeneration
is not sufficiently carried out due to the short travel distance or the running at low speeds,
or when the accumulated PM is beyond the specified level due to the other reasons, the engine-ECU
carries out the DPF regeneration according to the level, stores the diagnosis code and warns
the driver. When the level of PM accumulation might damage the engine, the engine-ECU illuminates
the engine warning lamp and stores the diagnosis code P1447. At that time, the engine-ECU considerably
decreases the output for the safety. When the vehicle with the engine warning lamp illuminated
is brought to the workshop, carry out the forcible regeneration of the DPF using M.U.T.-III.
(Refer to  )
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