Introduction to On Board Diagnostics (II)

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Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsSince OBD II became effective in 1994 ( adopted from CARB regulations),powertrain control strategies are focused on monitoring powertraincomponents for failures with criteria tied to emission levels in addition tobasic functionality. All the powertrain components described in previoussection on Powertrain and Emission Controls in Passenger vehiclesincluding sensors, actuators, and switches are checked for correct operation.In addition the performance of emission control apparatus are continuouslymonitored using OBD II Diagnostics criteria. The following is a list of themajor CARB related OBD I I diagnostic requirements for all vehiclemanufacturers:
Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsOBD I I Diagnostic RequirementsuEngine Misfire DetectionuCatalyst Efficiency MonitoruOxygen Sensor & Heater MonitoringuFuel System MonitoringuEvaporative System MonitoringuEGR System MonitoringuSecondary Air System MonitoringuComprehensive Components Monitoring (all sensors,actuators, and switches)
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Sensors and ActuatorsKnock sensorEm
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Secondary air valvesSensors and Act
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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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