Saturday, January 8, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 913

2010 Cadillac Truck SRX FWD V6-3.0L Page 913



DTC C1255 or C1256



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 C1255 00



- Electronic Control Unit Performance Malfunction



DTC C1256 00



- Control Module Programming Checksum Error Malfunction



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 set a DTC.



Conditions for Running the DTC



Ignition ON



Conditions for Setting the DTC



The control module detects an internal malfunction.



Action Taken When the DTC Sets



Specific subsystems will not function or operate in degraded mode.



Conditions for Clearing the DTC



A current DTC clears when the diagnostic runs and passes.



Reference Information



Schematic Reference



Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)



Description and Operation



ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information



Circuit/System Testing



1. Ignition ON, verify that DTC C056D or C056E is not present in the electronic brake control module (EBCM).

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