Introduction to On Board Diagnostics (II)

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Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsOxygen Sensor (O 2 ) Sensor ( DTCs 130-167):167): O 2sensor diagnostics areperformed to check deterioration of electrochemical pumping action thatgenerates voltage sensitivity to the oxygen density in the exhaustmanifold. In case of Zirconia electrode circuit malfunction fault code 130is assigned. If the O 2sensor is indicating slow response fault code 133 isassigned. The expected value is estimated using closed-loop loop frequencyand engine parameters. If the O 2sensor is indicating very low voltagefault code 131 is assigned. If the O 2sensor is indicating very highvoltage fault code 132 is assigned. If the O 2sensor is indicating noactivity, fault code 134 is assigned. In case of O 2sensor heater circuitmalfunction fault code 135 is assigned. The other codes from 135 5 to 167are assigned to similar faults for other O 2sensors and heaters in othercatalytic converters in the system. Oxygen sensor diagnostics are adescribed in detail in alter section.
Fundamentals of PowertrainControl strategies & OBD IIDiagnosticsMass air flow (MAF) sensor (DTC 100-104):104):MAF sensor diagnostics are performed for deterioration of electricalectricaland resister characteristics. In case of electrical circuit malfunctionmfault code 100 is assigned.If the sensor is indicating out of range 1reading fault code 1011isassigned. If the sensor is indicating very low reading fault code c102 isassigned. If the sensor is indicating very high reading fault code 103 isassigned. The expected value is estimated using MAP sensor readingand engine parameters. If the sensor is indicating intermittent ent faultyreading fault code 104 is assigned.
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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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Page 39 and 40: OBD II for L & MD VehiclesSTD Manua
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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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