СИСТЕМА СНИЖЕНИЯ ТОКСИЧНОСТИ ОТРАБОТАВШИХ ГАЗОВ


  1. OPERATION


    1. The ECM calculates the amount of NOxin the catalytic converter based on fuel injection volume, intake air mass and exhaust gas temperature, and operates the injectors and exhaust fuel addition injector for NOxreduction control.

    2. As a result of the operation of these injectors, the air fuel ratio in the exhaust gas becomes rich to purify the NOx.

    3. Fuel efficiency momentarily drops while this control is operative.

    4. If the DPNR catalyst temperature becomes low, catalytic converter performance decreases, resulting in an increase of the amount of PM stuck in the filter substrate. When the ECM detects clogs in the filter substrate based on the engine operating condition and signals from the differential pressure sensor, it operates the injectors and exhaust fuel addition injector for PM reduction.


      • As a result of the operation of these injectors, the air fuel ratio in the exhaust gas becomes rich and active oxygen is generated by NOxreduction control.

      • At the same time, the filter substrate temperature increases, and PM reacts with active oxygen and changes into CO2for purification.

      • Fuel efficiency drops while this control is operative.

    5. The ECM calculates the sulfur volume in the catalytic converter based on the accumulated data of the fuel injection volume and operates the injectors and exhaust fuel addition injector for sulfur position recovery control.

    6. As a result of the operation of these injectors, the air fuel ratio in the exhaust gas becomes rich for sulfur purification.


      • Fuel efficiency drops while this control is operative.

      A00YY6DC01
      *1 Injector Assembly *2 Exhaust Fuel Addition Injector
      *3 Intake Mass Air Flow Meter Sub-assembly *4 Injector Driver
      *5 Exhaust Gas Temperature Sensor (Upper Side) *6 No. 2 Exhaust Gas Temperature Sensor (Lower Side)
      *7 Differential Pressure Sensor *8 Air Fuel Ratio Sensor
      *9 Engine Coolant Temperature Sensor *10 ECM

      Tech Tips


      • When replacing the exhaust manifold converter with a new one, it is necessary to perform initialization of the DPNR catalyst deterioration data history in the ECM by using a Global TechStream (GTS).

      • When replacing the ECM with a new one, it is necessary to read DPNR catalyst deterioration data history from the installed ECM and then transfer that data history to the new ECM by using the GTS. When the DPNR catalyst deterioration data history is not transferred, Diagnostic Trouble Code (DTC) P062F is stored in the ECM and the MIL comes on.

      • When replacing both the exhaust manifold converter and the ECM, it is necessary to perform initialization of the DPNR catalyst deterioration data history in the ECM using the GTS. When DPNR catalyst deterioration history initialization is not performed, DTC P062F is stored in the ECM and the MIL comes on.