Introduction to On Board Diagnostics (II)
Introduction to On Board Diagnostics (II)
Introduction to On Board Diagnostics (II)
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Fundamentals of PowertrainControl strategies & OBD <strong>II</strong><strong>Diagnostics</strong>Since OBD <strong>II</strong> became effective in 1994 ( adopted from CARB regulations),powertrain control strategies are focused on moni<strong>to</strong>ring powertraincomponents for failures with criteria tied <strong>to</strong> emission levels in addition <strong>to</strong>basic functionality. All the powertrain components described in previoussection on Powertrain and Emission Controls in Passenger vehiclesincluding sensors, actua<strong>to</strong>rs, and switches are checked for correct operation.In addition the performance of emission control apparatus are continuouslymoni<strong>to</strong>red using OBD <strong>II</strong> <strong>Diagnostics</strong> criteria. The following is a list of themajor CARB related OBD I I diagnostic requirements for all vehiclemanufacturers:
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