Introduction to On Board Diagnostics (II)

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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.
Sensors and ActuatorsEmployed in OBD IIDiagnosticsOBD II tests all sensors, actuators (valves) , switches, and wiring ing for proper connectivity,and checks the inputs and outputs of each device are within allowed range of values. Thefollowing sensors and actuators are tested and monitored by the OBD II diagnostics:Coolant temperature sensorIntake air temperature sensorManifold Absolute Pressure (MAP) sensorEngine Speed (Angular speed) sensorExhaust Gas Oxygen (EGO) sensorThrottle Position (Angle) (TPS) sensorCrankshaft (angular) Position sensorMass Air Flow (MAF) sensorKnock sensorIgnition timing sensorIgnition actuatorIdle air control (IAC) valveSecondary air valveEGR actuator (pintle(valve)Fuel metering actuatorFuel injector
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Introduction to On BoardDiagnostics
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OBD II monitors more components and
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Powertrain and EmissionControls in
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Powertrain and EmissionControl in P
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OBD II for L & MD VehiclesSTD Manua
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OBD II for L & MD VehiclesDiagnosti
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Introduction to On Board Diagnostics (II)

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