12/4/19

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1533

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1533



received. While this enable voltage is being received, the fuel pump flow control module supplies a varying voltage to the in-tank fuel pump



module in order to maintain the desired fuel line pressure.



Conditions for Running the DTC



* The engine speed is greater than 80 RPM.



* The ignition 1 signal parameter is 10-18 V.



* The ECM has commanded the fuel pump enable circuit ON and OFF at least once during the ignition cycle.



* The DTCs run continuously when the conditions above are met.



Conditions for Setting the DTC



P0627



The ECM detects the fuel pump enable circuit voltage is less than 2.74 V when the enable circuit is commanded OFF. The condition exists for



greater than 4 seconds, or a cumulative of 30 seconds.



P0628



The ECM detects the fuel pump enable circuit voltage is less than 2.21 V when the enable circuit is commanded ON. The condition exists for



greater than 4 seconds, or a cumulative of 30 seconds.



P0629



The ECM detects the fuel pump enable circuit voltage is greater than 2.21 V when the enable circuit is commanded OFF. The condition exists for



greater than 4 seconds, or a cumulative of 30 seconds.



Action Taken When the DTC Sets



DTCs P0627, P0628, and P0629 are Type B DTCs.



Conditions for Clearing the DTC



DTCs P0627, P0628, and P0629 are Type B DTCs.



Reference Information



Schematic Reference



Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics



(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)



Connector End View Reference



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



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)



Scan Tool Reference



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



Circuit/System Verification



1. Attempt to start the engine. Observe the DTC information with a scan tool. DTC P0627, P0628, or P0629 should not set.



2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the



conditions that you observed from the Freeze Frame/Failure Records data.



Circuit/System Testing



1. Ignition OFF, disconnect the K27 fuel pump control module harness connector.



2. Connect a test lamp between the enable circuit terminal 13 of the fuel pump control module and ground.



3. Ignition ON, command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF as commanded.

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