2010 Cadillac CTS Sedan AWD V6-3.6L Page 1089
* The HO2S 1 heater duty cycle is greater than 70 percent or, the calculated exhaust gas temperature is warmer than 600掳C (1,112掳F).
* Closed loop fuel control is enabled.
* The evaporative emissions system (EVAP) is not performing an intrusive test.
* The DTCs run continuously once the conditions above exist for greater than 30 seconds.
Conditions for Setting the DTC
Condition 1
The ECM detects that the HO2S 1 signal voltage increases to greater than 2 volts within 4 ms of 4 out of 6 HO2S heater switch OFF samples.
Condition 2
The HO2S 1 voltage is between 520-1,150 mV and the corresponding HO2S 2 voltage is less than 100 mV.
Condition 3
The HO2S 1 voltage is between 60-400 mV and the corresponding HO2S 2 voltage is less than 500 mV.
Action Taken when the DTC Sets
DTCs P0130 and P0150 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0130 and P0150 are Type B DTCs.
Diagnostic Aids
* The HO2S 1 voltage should be between 350-550 mV with the ignition ON. If the voltage is greater than the specified value, there is a
condition with the HO2S 1 circuits. If the voltage does not change after disconnecting the HO2S, the condition is between the sensor and the
ECM. If the voltage is between 350-550 mV after disconnecting the sensor, the condition is with the HO2S 1.
* Inspect the HO2S 1 harness connector for water intrusion. Moisture in a connector may cause voltage to bleed to other circuits within the
connector.
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. Ignition ON, observe the appropriate scan tool HO2S 1 voltage parameter. The HO2S 1 voltage parameter should be less than 1,025 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
1. Ignition OFF, disconnect the harness connector at the appropriate HO2S 1.
2. Ignition ON, verify that the scan tool HO2S 1 voltage parameter is between 350-500 mV.
