2010 Cadillac CTS Sedan AWD V6-3.6L Page 1123
P0175 sets.
Conditions for Running the DTC
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0201-P0206, P0300-P0306, P0442, P0443, P0446, P0449, P0451-P0455, P0496,
P0506, P0507, P2227-P2230, P2269 are not set.
* The engine is in Closed Loop status.
* The engine coolant temperature (ECT) is between -38 and +150掳C (-36 and +302掳F).
* The intake air temperature (IAT) is between -38 and +150掳C (-36 and +302掳F).
* The manifold absolute pressure (MAP) is between 5-255 kPa (1.45-37 psi).
* The vehicle speed is less than 134 km/h (83 mph).
* The engine speed is between 400-6,600 RPM.
* The mass air flow (MAF) is between 0.5-510 g/s.
* The barometric pressure (BARO) is greater than 70 kPa (10.2 psi).
* The fuel level is greater than 10 %.
* This diagnostic runs continuously when the above conditions have been met.
Conditions for Setting the DTC
* The average long term FT weighted average value is greater or less than a calibrated value.
* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.
Action Taken When the DTC Sets
DTCs P0171, P0172, P0174, and P0175 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0171, P0172, P0174, and P0175 are Type B DTCs.
Diagnostic Aids
* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value
should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.
* The normal Short Term FT and Long Term FT parameters should be between +10 and -10 % with 0 % the optimum, with the engine running
at operating temperature.
* An HO2S will not cause this DTC to set without the occurrence of the circuit related HO2S DTCs. Do not replace an HO2S to address this
DTC.
* A fuel system delivery condition causes this DTC to set. Thoroughly inspect all items that cause a rich or a lean condition. Refer to Fuel
System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General
Diagnostics/Fuel System Diagnosis).
* Any un-metered air into the engine causes this DTC to set. Thoroughly inspect all areas of the engine for vacuum leaks.
* A MAF sensor condition can cause this DTC without setting a MAF DTC. If there is a MAF sensor condition, the MAF sensor parameters
will appear to be within range.
* Inspect the air filter for being the correct one for this application. Make sure that the engine oil fill cap is in place and that it is tight. Verify
that the engine oil dip stick is fully seated.
Reference Information
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. Observe the DTC information with a scan tool. DTC P0171, P0172, P0174, or P0175 should not be set.
2. Engine running, observe the DTC information with a scan tool. Verify there are no HO2S DTCs set.
瀚慖f any HO2S DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
