2010 Cadillac CTS Sedan AWD V6-3.6L Page 720

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 720



DTC C0550



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC C0550 00



- Electronic Control Unit (ECU) Performance



DTC C0550 31



- Electronic Control Unit (ECU) Performance



DTC C0550 32



- ECU Performance General Memory Failure



DTC C0550 34



- ECU Malfunction RAM Failure



DTC C0550 35



- ECU Malfunction ROM Failure



DTC C0550 36



- ECU Malfunction EEPROM Failure



DTC C0550 37



- ECU Malfunction Watch Dog failure



DTC C0550 38



- ECU Performance Supervision Software Failure



DTC C0550 39



- ECU Performance Internal Electronic Failure/Discard



DTC C0550 4B



- ECU Internal Fault



Circuit/System Description



When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an



internal malfunction is detected, the control module will store a DTC C0550 in its memory.



Conditions for Running the DTC



The microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. The only requirements are voltage and



ground.



Conditions for Setting the DTC



* The control module detects an internal write malfunction.



* The control module detects an internal checksum malfunction.



Action Taken When the DTC Sets



* The affected system warning indicator/warning message will activate.



* The affected system will be disabled.



Conditions for Clearing the DTC



* A current DTC clears when the malfunction is no longer present.



* A history DTC clears when the control module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.



Circuit/System Verification

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