GENERAL INFORMATION



The emission control is basically the same as the 4B1 engine mounted on the ASX.

SYSTEM CONFIGURATION DIAGRAM





Exhaust gas cleaning devices list
System
Objective / Function
Composition parts
Crankcase ventilation system
HC decrease
Re-combustion of blow-by gas.
Positive crankcase ventilation (PCV) valve
Evaporative emission control system
HC decrease
Re-combustion of blow-by gas.

  • Canister
  • Purge control solenoid valve

Emission reduction systems
Air-fuel ratio feedback control
Decrease of CO, HC and NOx
Controls air-fuel ratio of air-fuel mixture to become theoretical air-fuel ratio (about 14.7), which is when the 3-way catalytic converter’s cleaning performance is best. It also controls optimum fuel supply based on coolant temperature, driving conditions etc.

  • Engine-ECU
  • Air flow sensor
  • Injector
  • Oxygen sensor
  • Crank angle sensor etc.

Catalytic converter
Decrease of CO, HC and NOx
It facilitates oxidation of CO and HC and reduction of NOx so that all 3 component gases are cleaned simultaneously.
Monolith catalyst