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Home >> BMW >> 2009 >> 528xi Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2259 (Self Diagnosis - Theory & Operation (N54)) >> 1.14 Comprehensive Component Monitoring OBD II Siemens VDO function definition >> 1.14.2 Ambient Air Temperature (AAT) Monitoring >> 1.14.2.1 CAN based Ambient Air Temperature - Signal Diagnosis >> 1.14.2.1.1 General description

1.14.2.1.1 General description

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The purpose of this diagnosis is to detect electrical faults as defined in OBDI requirements. The input signal is a CAN message of instrument cluster. If an error is detected by the instrument cluster, the error symptom is sent via CAN to the ECU. The ECU then de-bounces the error and stores it in the error management.

Error Symptoms

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