Monday, February 10, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1794

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1794



Conditions for Clearing the DTC



* A current DTC P1631 will be when a correct fuel enable password is received.



* A history DTC will be cleared after 40 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.



Reference Information



Schematic Reference



Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer



Schematics)



Connector End View Reference



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



Description and Operation



Immobilizer Description and Operation (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and



Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and



Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)



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



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



Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)



Scan Tool Reference



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



Circuit/System Verification



Important: Because of normal system communications between the TDM and ECM, any theft deterrent B-codes must be diagnosed prior



to the diagnosis of P-codes.



Perform the 10-Minute Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming (without RPO Y41) (See:



Accessories and Optional Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming and Relearning/Immobilizer System



Component Programming (without RPO Y41))Immobilizer System Component Programming (with RPO Y41) (See: Accessories and Optional



Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming and Relearning/Immobilizer System Component Programming (with



RPO Y41)). The ECM should successfully complete the password learn and the vehicle should start.



If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup and programming



With Y41



DTC P1632 (with 41)



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 Descriptor



DTC P1632



- Theft Deterrent Fuel Disable Signal Received



Circuit/System Description

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