Introduction to On Board Diagnostics (II)

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Introduction to On BoardDiagnostics (II)The intent of OBD II systems is to detect most vehiclemalfunctions when performance of a powertrain component orsystem deteriorates to the point thatthe vehicle’s HC emissions exceed the thresholdvalue tied to the applicable EPA emission standard.The vehicle operator is notified at the time when the vehiclebegins to marginally exceed emission standards, byilluminating the Malfunction Indicator Light (MIL)
Introduction to On BoardDiagnostics (II)Both CARB and EPA regulations require monitoring of systems, and illuminatingMIL and storage of a Diagnostic Trouble Code (DTC) if a fault is detected.Once per trip evaluation:uCatalyst Catalyst efficiency (conversion efficiency)uHeated Heated catalyst (time to attain rated temperature)uEvaporative system (air flow /vapor leak detection)uSecondary Air system (proper air amount during idle)uOxygen Oxygen sensor (output voltage and response frequency)uOxygen Oxygen sensor heater (proper current and voltage drop)uEGR EGR system (proper exhaust gas flow rate into intake manifold)
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The Freeze Frame can also be used f
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Fundamentals of PowertrainControl s
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Evaporative System Monitoring: Hydr
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OBD(II)In addition the electrical c
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Sensors and ActuatorsEmployed in OB
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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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