Introduction to On Board Diagnostics (II)

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Sensors and ActuatorsEmployed in OBD IIDiagnosticsDiagnosticsThe electrical characteristics of the Ignition actuator maydeteriorate, resulting in incorrect output, out of range/performancevalues, stuck at low signal, stuck at high signal,, and intermittentfailure.OBD II DTCsThe failure modes of ignition actuatorare diagnosed by OBD II. DTCs for these faults are 350-379.
Sensors and ActuatorsEmployed in OBD IIEGR actuatorDiagnosticsPrinciple of operationThe EGR actuator is a vacuum operateddiaphragm valve, with a spring that holds the valve closed if no vacuum is applied.The vacuum that operates the diaphragm is supplied by the intake manifold and iscontrolled by a solenoid operated valve under control of the PCM. When thesolenoid is energized by the PCM the EGR valve is opened by the applied vacuum.When the solenoid is deenergized the the vacuum is cut off from the EGR valve andthe spring holds the EGR valve closed. The amount of EGR is controlled by theduty cycle of the pulsed control current that is proportional to the average time ofenergized solenoid. The duty cycle, and the valve opening are properly controlledto ensure exact amount of EGR is provided without adversely affecting emissions.The duty cycle of the current pulse that energizes the solenoid ,Diagnostics and the EGR amount are correlated periodically by OBD IIdiagnostics.OBD II DTCs The failure modes of EGR flow are diagnosed by OBD II. DTCs for these faultsare 400-408.
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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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Fundamentals of PowertrainControl s
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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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Introduction to On Board Diagnostics (II)

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