P2271
DTC P0133, P1133, P2270, or P2271
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0133
-
HO2S Slow Response Sensor 1
DTC P1133
-
HO2S Insufficient Switching Sensor 1
DTC P2270
-
HO2S Signal Stuck Lean Sensor 2
DTC P2271
-
HO2S Signal Stuck Rich Sensor 2
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,275 mV. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1,000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the control module to calculate the air-to-fuel ratio sooner.
Conditions for Running the DTC
P0133 and P1133
* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0300, P0411, P0412, P0418, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496 are not set.
* The engine coolant temperature (ECT) is hotter than 70°C (158°F).
* The Ignition voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The engine run time is greater than 120 s.
* The engine speed is between 1,000-3,500 RPM.
* The device controls are not active.
* The HO2S heaters have been ON for greater than 40 s.
* The intake air temperature (IAT) is hotter than -40°C (-40°F).
* The fuel composition is less than 87 percent ethanol.
* The barometric pressure is greater than 70 kPa.
* The fuel control is not in power enrichment.
* Decel fuel cut-off is not active.
* The Mass Airflow (MAF) Sensor parameter is between 14-40 g/s.
* The fuel state is in Closed Loop.
* DTCs P0133 and P1133 run once per drive cycle when the above conditions are met for 3 s.
P2270
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270, P2271 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The pedal position is less than 4 percent.
* The engine speed is between 1,250-2,300 RPM.
* The engine airflow is equal to or more than 3 g/s and equal to or less than 12 g/s.
* The vehicle speed is equal to or more than 55 km/h (34.2 mph) and equal to or less than 120 km/h (74.6 mph).
* The fuel state is in Closed Loop.
* The evaporative emission (EVAP) diagnostics are not in control of purge.
* The HO2S heaters are ON for more than 180 s.
* The predicted catalytic converter temperature is between 600-900°C (1,112-1,652°F).
* This DTC runs once per trip when all of the above conditions have been met for 1 s.
P2271
* DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0128, P013A, P013B, P013E, P013F, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0411, P0412, P0418, P1174, P1516, P2101, P2119, P2135, P2176, P2270 are not set.
* The system voltage is between 10-32 V.
* The fuel level is greater than 10 percent.
* The engine speed is 1,250-2,300 RPM.
* The engine air flow is between 3-12 g/s.
* The vehicle speed is between 55-120 kph (34.2-74.6 mph).
* The fueling state is in Closed Loop.
* The EVAP is not in control of purge.
* Power take-off is not active.
* The HO2S heaters have been on more than 180 s.
* The predicted catalyst temperature is between 600-900°C (1,112-1,652°F).
* DTCs P013A, P013E, and P2270 have run and passed.
THEN
* DFCO is active.
* The APP is stable.
* This DTC runs once per trip when the above conditions are met for 3 s.
Conditions for Setting the DTC
P0133
* The ECM detects that the HO2S 1 average response time is greater than a calculated value.
* DTC P0133 sets within 60 s when the above condition is met.
P1133
* The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
* DTC P1133 sets within 60 s when the above condition is met.
P2270
* The ECM detects that the O2 sensor cannot achieve voltage equal to or more than 775 mV.
AND
* The ECM detects that the accumulated mass air flow monitored during the Stuck Lean Voltage Test is more than a calibrated value.
P2271
* The ECM detects that the O2 sensor cannot achieve voltage equal to or less than 100 mV.
AND
* The ECM detects that the accumulated mass air flow monitored during the Stuck Rich Voltage Test is more than a calibrated value.
Action Taken When the DTC Sets
DTCs P0133, P1133, P2270, and P2271 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0133, P1133, P2270, and P2271 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LE9) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the DTC information with a scan tool. Verify no B52 HO2S heater DTCs are set.
• If a B52 HO2S heater DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify none of the following conditions exist:
* Lean or rich fuel injectors-Refer to Fuel Injector Solenoid Coil Test Fuel Injector Solenoid Coil Test.
* Water intrusion in the HO2S harness connector
* Low or high fuel system pressure-Refer to Fuel System Diagnosis Fuel System Diagnosis.
* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis Testing and Inspection.
* Fuel saturation of the evaporative emission (EVAP) canister
* Exhaust leaks-Refer to Exhaust Leakage Exhaust Leakage.
* Engine vacuum leaks
* Engine oil consumption
* Engine coolant consumption-Refer to Loss of Coolant Loss of Coolant.
• If you find any of the above conditions, repair as necessary.
3. If all conditions test normal, test or replace the appropriate HO2S.
4. 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Heated Oxygen Sensor Replacement - Sensor 1 Heated Oxygen Sensor Replacement - Sensor 1
* Heated Oxygen Sensor Replacement - Sensor 2 Heated Oxygen Sensor Replacement - Sensor 2
* Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a HO2S.
* Control Module References Control Module References for engine control module (ECM) replacement, programming and setup.