2010 Cadillac CTS Sedan AWD V6-3.6L Page 1102
* The engine is not in decel fuel cut-off (DFCO).
* The HO2S 1 is at operating temperature for greater than 10 seconds.
* The internal HO2S 1 resistance is less than 10,000 ohms.
* The HO2S 1 heater is enabled for greater than 120 seconds.
* DTCs P0135 and P0155 run continuously once the above conditions are met for approximately 100 seconds.
P0141 or P0161
* Before the ECM can report DTC P0141 or P0161 failed, DTCs P0036, P0037, P0038, P0056, P0057, and P0058 must run and pass.
* DTCs P0137, P0138, P0140, P0157, P0158, or P0160 are not set.
* The engine speed is greater than 240 RPM.
* The ignition voltage is 10-18 volts.
* The intake air temperature (IAT) is greater than -30掳C (-22掳F).
* After the previous ignition cycle the engine OFF time was greater than 0 seconds.
* The calculated exhaust temperature is 300-750掳C (572-1,382掳F), 300-700掳C (572-1,292掳F) for LLT.
* The engine is not in decel fuel cut-off (DFCO).
* The internal HO2S 2 resistance is less than 10,000 ohms.
* The HO2S 2 heater is enabled for greater than 120 seconds.
* DTCs P0141 and P0161 run continuously once the above conditions are met for approximately 100 seconds.
Conditions for Setting the DTC
P0135 or P0155
The ECM detects that the internal resistance of the HO2S 1 heater is not within the expected range for greater than 12 seconds.
P0141 or P0161
The ECM detects that the internal resistance of the HO2S 2 heater is not within the expected range for greater than 6 seconds.
Action Taken When the DTC Sets
DTCs P0135, P0141, P0155, and P0161 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0135, P0141, P0155, and P0161 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
Note: It may take up to 8 minutes for the DTC to set.
1. With the engine at normal operating temperature, operate the engine above 1,200 RPM for 2 minutes and then allow the engine to idle. DTCs
P0135, P0141, P0155, or P0161 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.
