Thursday, March 5, 2020

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1224

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1224



Circuit/System Description



The engine control module (ECM) monitors the control circuit of the brake booster pump relay. The ECM supplies ground through the pump relay



control circuit which then supplies B+ voltage to actuate the brake booster pump. B+ voltage is supplied at all times to the coil side of the pump



relay.



Conditions for Running the DTC



P258A, P258C, P258D



Ignition ON.



P258B



* Engine Running



* Vacuum pump is activated for greater than 1.6 seconds.



Conditions for Setting the DTC



P258A, P258C



The ECM detects an open/high resistance on the relay coil control circuit.



P258B



The ECM detects an excessive difference in vacuum levels between the power brake booster and the manifold absolute pressure (MAP).



P258D



The ECM detects a short to voltage on the relay control circuit.



Action Taken When the DTC Sets



DTC P258A, P258B, P258C, P258D are Type B DTCs.



Conditions for Clearing the DTC



DTC P258A, P258B, P258C, P258D are Type B DTCs.



Reference Information



Schematic Reference



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



Connector End View Reference



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



Description and Operation



Brake Booster Vacuum Assist Description and Operation (See: Brakes and Traction Control/Hydraulic System/Description and Operation/Brake



Booster Vacuum Assist Description and Operation)



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)



DTC Type Reference



Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code



(DTC) Type Definitions)