Monday, April 26, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 938

2010 Cadillac CTS Sedan AWD V6-3.6L Page 938



* The HO2S 2 is at operating temperature.



* The DTCs run continuously when the above conditions are met for greater than 500 mS.



Conditions for Setting the DTC



P0030, P0036, P0050, and P0056



The ECM detects an open in the heater circuits of the HO2S when the heater is commanded OFF. The condition exists for greater than 4 seconds or



a cumulative of 30 seconds.



P0031, P0037, P0051, and P0057



The ECM detects a short to ground in the heater circuits of the HO2S when the heater is commanded OFF. The condition exists for greater than 4



seconds or a cumulative of 30 seconds.



P0032, P0038, P0052, and P0058



The ECM detects a short to voltage in the heater circuits of the HO2S when the heater is commanded ON. The condition exists for greater than 4



seconds or a cumulative of 30 seconds.



Action Taken When the DTC Sets



DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, and P0058 are Type B DTCs.



Conditions for Clearing the MIL/DTC



DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0050, P0051, P0052, P0056, P0057, and P0058 are Type B DTCs.



Diagnostic Aids



* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Circuit



Test Status parameters for the component. The circuit status parameters change from OK or Not Run to Fault if there is a condition with the



circuit or a connection.



* An open fuse in the HO2S heater circuit may be caused by the heater element in one of the sensors. The condition may not be present until



the sensor operates for a period of time. If no fault is present in the heater circuit, monitor the amperage of each heater using the DMM to



determine if one of the heater elements is the cause of the open fuse. Inspect the sensor pigtail or the harness for contacting the exhaust



system.



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. Engine idling at operating temperature for at least 30 seconds. Observe the DTC information, DTCs P0030, P0031, P0032, P0036, P0037,



P0038, P0050, P0051, P0052, P0056, P0057, and P0058 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

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