Introduction to On Board Diagnostics (II)

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Introduction to On BoardDiagnostics (II)Although OBD II requirements reflect state-ofof-the-art diagnosticsystem capability, there are limitations which apply to thecurrent techniques for detecting malfunctioning components.These limitations do not allow OBD II systems to take the placeof the FTP test for measuring vehicle emissions.The reason is that monitoring systems can detect whencomponents are functioning within their operating range, butare limited with the ability to determine whether they arefunctioning accurately within the range.
Introduction to On BoardDiagnostics (II)OBD II is associated with IM240, the enhanced inspection/maintenanceanceprogram for states with air quality program like California.IM240 also gets into the area of the new ASE (AutomotiveService Engineering) tests for the “super mechanics.”OBD II rules are copied from the CARB rules until 1997.OBD II rules for 1998 will be taken from EPA’s standards which includeiamong other things, an onboard computer to predict when a vehiclewill fail an emission test.
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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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