2010 Cadillac CTS Sedan AWD V6-3.6L Page 1092
* DTC P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,
P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.
* The ignition voltage is greater than 10 volts.
* The engine speed is greater than 240 RPM.
* The air flow into the engine is greater than 220 grams.
* The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.
* The evaporative emissions system (EVAP) is not performing an intrusive test.
* The ECM is not commanding the air/fuel mixture lean.
* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.
Condition 2
* DTC P0116, P0117, P0118, P0119, P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270,
P0271, P0273, P0274, P0276, P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.
* The ignition voltage is greater than 10 volts.
* The engine speed is greater than 240 RPM.
* The conditions for a cold start are present.
* The HO2S 1 heater duty cycle is greater than 90 percent.
* DTC P0131 and P0151 run continuously once the conditions above exist for greater than 5 seconds.
Conditions for Setting the DTC
Condition 1
The ECM detects that an HO2S 1 signal voltage is less than 60 mV while the corresponding HO2S 2 voltage is greater than 500 mV.
Condition 2
The ECM detects that an HO2S 1 signal voltage is less than 60 mV after a cold start.
Action Taken when the DTC Sets
DTCs P0131 and P0151 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0131 and P0151 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. Engine idling, observe the appropriate scan tool HO2S 1 voltage parameter. The voltage should fluctuate above and below the range of
350-550 mV.
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
