Introduction to On Board Diagnostics (II)

Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsCatalytic converter ( DTCs 420-434):434):Catalyst system efficiency diagnostics are performed fordeterioration of characteristics, for Bank 1. In case of Catalystsystem efficiency below threshold, fault code 420 is assigned. Incase of Warm Up Catalyst efficiency below threshold, fault code421 is assigned. In case of Main Catalyst efficiency belowthreshold, fault code 422 is assigned. In case of Heated Catalystefficiency below threshold, fault code 423 is assigned. In case e ofHeated catalyst temperature, below threshold, fault code 424 isassigned. For identical faults for Bank2 , fault codes 430 to 434are respectively assigned. Catalytic converter diagnostics aredescribed in detail in later section.