2010 Cadillac CTS Sedan AWD V6-3.0L Page 1931
Conditions for Setting the DTC
* The ECM detects that the HO2S signal voltage increases greater than 2 volts within 40 mS, in 4 out of 6 HO2S heater switch OFF samples.
* The condition exists for greater than 1 second, or for a cumulative of 10 seconds.
Action Taken when the DTC Sets
DTCs P2232 and P2235 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2232 and P2235 are Type B DTCs.
Diagnostic Aids
* The HO2S 2 voltage should be between 400-520 mV with the ignition ON. If the voltage is greater than the specified value, there is a
condition with the HO2S circuits. If the voltage does not change after disconnecting the HO2S 2, the condition is between the sensor and the
ECM. If the voltage is between 400-520 mV after disconnecting the sensor, the condition is with the HO2S 2.
* Inspect the HO2S 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 HO2S 2 voltage parameter. The HO2S 2 voltage parameter should be less than 1,050 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 2.
2. Ignition ON, verify that the HO2S parameter is between 400-520 mV.
瀚慖f greater than the specified range, test the signal circuit of the HO2S sensor for a short to the heater circuit. If the circuit/connections test
normal, replace the ECM.
3. If all circuits/connections test normal, replace the appropriate HO2S 2.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen
Sensor/Service and Repair)Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LLT) (See: Powertrain Management/Computers and
Control Systems/Oxygen Sensor/Service and Repair)
* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen
