Introduction to On Board Diagnostics (II)

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Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsEngine Coolant Temperature Sensor ( DTCs 115-119, 119, 125-126):126):Engine Coolant Temperature sensor diagnostics areperformed for deterioration of thermister characteristics. In case of thermisterand electrical circuit malfunction fault code 115 is assigned.If the sensor circuit is indicating out of range reading fault code 116 is assigned.If the sensor circuit is indicating very low reading fault code 117 is assigned. Ifthe sensor circuit is indicating very high reading fault code 118 is assigned.The expected value is estimated using engine parameters. If the tsensor circuitis indicating intermittent faulty reading fault code 119 is assigned. Forinsufficient coolant temperature for closed loop fuel control fault code 125 isassigned. For insufficient coolant temperature for stable operation fault code126 is assigned.
Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsKnock Sensor ( DTCs 325-334):334): Knock sensor diagnostics areperformed for deterioration of piezoelectric or magneto restrictivecharacteristics. In case of electrical circuit malfunction fault t code 325 isassigned. If the sensor 1 circuit is indicating out of range readingfault code 326 is assigned. If the sensor 1 circuit is indicating very lowreading fault code 327 is assigned. If the sensor 1 circuit is indicatingvery high reading fault code 328 is assigned. Knocking is detected ected bythe oscillation frequency of the piezoelectric device or the voltagedeveloped by themagnetorestrictive device when knocking occurs. Ifthe sensor 1 circuit is indicating intermittent faulty reading g fault code329 is assigned.If the sensor 2 circuit is indicating same faults as listed above, fault codes330-3334 3334 are assigned to the respective faults. Knock sensor diagnosticsare described in detail in a later section.
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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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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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