Introduction to On Board Diagnostics (II)

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Introduction to On BoardDiagnostics (II)Most components are monitored, including the catalyst andevaporative system, such that a malfunction is signaled as theemissions exceed 1.5 time the applicable standards.OBD II requires the detection of relatively low rates of enginemisfire, to prevent serious damage to the catalytic converter .
Introduction to On BoardDiagnostics (II)Further, OBD II also includes “Freeze Frame”, which allows thecomputer to store in memory the exact operating conditionswhen a fault occurred, so intermittent faults can be investigatedby revisiting the same conditions when the problem occurred.A standard access electrical connector which is identical for allvehicles is required, which means that a single inexpensivegeneric tool can be used to read out fault codes.
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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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