Introduction to On Board Diagnostics (II)

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Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsThrottle position Sensor (TPS) ( DTCs 120-124, 124, 220-229):229):TP sensor diagnostics are performed for deterioration of potentiometer tiometer operatedswitch A circuit characteristics. In case of switch A circuit malfunctionmfault code 120 is assigned. If the switch A circuit is indicating out of rangereading fault code 121 is assigned. If the switch A circuit is indicating very lowreading fault code 122 is assigned. If the switch A circuit is indicating very highreading fault code 123 is assigned. The expected value is estimated using air flowsensor reading and engine parameters. If the switch A circuit is indicatingintermittent faulty reading fault code 124 is assigned. For switch B circuit , faultcodes 220-224 224 are set for identical faults listed above. For switch C circuit cuit , faultcodes 225-229 229 are set for identical faults listed above.
Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsCrankshaft Angular Position Sensor ( DTCs 335-344, 344, 385- 389):Crankshaft angular position sensor diagnostics are performedfor deterioration of magnetic reluctance of sensor A circuitcharacteristics. In case of sensor A circuit malfunction faultcode 335 is assigned. If the sensor A circuit is indicating outoof range reading fault code 336 is assigned. If the sensor Acircuit is indicating very low reading fault code 337 is assigned. aIf the sensor A circuit is indicating very high readingfault code 338 is assigned. The expected value is estimatedusing engine speed another engine parameters.If the sensor A circuit is indicating intermittent faulty reading faultcode 339 is assigned. For sensor C circuit , faultcodes 34 0-3440are set for identical faults listed above.For sensor B circuit , fault codes 385-389 389 are set foridentical faults listed above.
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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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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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