Chevrolet Trax: DTC P0133, P1133, P2270, OR P2271 (LUJ)

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide 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

HO2S 1 or 2

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 0-1 000 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

• DTC P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0443, P1516, P2101, P2119, P2135 or P2176 is not set.
• The engine coolant temperature (ECT) sensor parameter is more than 70ºC (158ºF).
• The ignition signal parameter is between 10-18 V.
• The fuel level sensor parameter is more than 10%.
• The engine run time parameter is more than 200 s.
• The engine speed parameter is between 1 000-3 500 RPM.
• The manifold absolute pressure (MAP) sensor parameter is more than 30 kPa.
• The mass air flow (MAF) sensor parameter is between 11-50 g/s.
• The loop status parameter is closed.
• The throttle position indicated angle parameter is more than 5%.
• DTC P0131 runs once per drive cycle when the above conditions are met for 2 s.

P1133

• DTC P0068, P0101, P0102, P010, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0443, P1516, P2101, P2119, P2135 or P2176 is not set.
• The ECT sensor parameter is more than 70ºC (158ºF).
• The engine speed parameter is between 1 500-3 500 RPM.
• The system voltage is between 10-18 V.
• The engine run time parameter is more than 200 s.
• The loop status parameter is closed.
• The throttle position indicated angle parameter is more than 5.
• The fuel level sensor parameter is more than 10%.
• The MAP sensor parameter is more than 30 kPa.
• The MAF sensor parameter is between 11-50 g/s.
• The engine coolant is hotter than 50.25ºC (122.45ºF).
• DTC P1133 runs once per drive cycle when the above conditions are met for 2 s.

P2270

• DTC P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0443, P1133, P1516, P2101, P2119, P2135, P2176 or P2271 is not set.
• The system voltage is between 10-18 V.
• The fuel level is more than 10%.
• Engine run time is equal to or more than 255 s.

Then

• The engine speed is between 1 100-3 200 RPM.
• The airflow is equal to or more than 0 g/s and equal to or less than 25 g/s.
• The vehicle speed is equal to or more than 45 km/h (28 MPH) and equal to or less than 129 km/h (80 MPH).
• The short term fuel trim is equal to or more than 0.9, and equal to or less than 1 065.
• The loop status parameter is closed.
• The evaporative emission (EVAP) diagnostics are not in control of purge.
• The heater warm-up delay is more than 120 s.
• The catalyst temperature is equal to or more than 650ºC (1 202ºF), and equal to less than 900ºC (1 652º F).
• DTC P2270 runs once per trip when the above conditions have been met for 2 s.

P2271

• DTC P0030, P0036, P0053, P0054, P0101, P0102, P0103, P0106, P0107, P0108, P0120, P0121, P0122, P0123, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A, P013B, P013E, P013F, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0222, P0223, P0300, P0443, P1133, P1516, P2101, P2119, P2135, P2176 or P2270 is not set.
• The system voltage is between 10-18 V.
• The fuel level is more than 10%.
• Engine run time is equal to or more than 255 s.

Then

• Deceleration fuel cut-off is active.
• The accelerator pedal position (APP) is stable.
• The torque converter clutch (TCC) is locked.
• DTC P013A, P013E, and P2270 have run and passed.
• DTC P2271 runs once per trip.

Conditions for Setting the DTC

P0133

• The ECM detects that the heated oxygen sensor (HO2S) 1 rich to lean or lean to rich average response time is more than 0.1 s.
• DTC P0133 sets within 60 s when the above condition is met.

P1133

• The ECM detects that the heated oxygen sensor (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 heated oxygen sensor (HO2S) 2 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 45 g.

P2271

• The ECM detects that the heated oxygen sensor (HO2S) 2 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 20 g.

Action Taken When the DTC Sets

DTC P0133, P1133, P2270 and P2271 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0133, P1133, P2270 and P2271 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (Encore) , Engine Controls Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify no HO2S heater DTCs are set.

• If a DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

• If a DTC is not set

3. Verify none of the following conditions exist:

• Lean or rich fuel injectors-Refer to Fuel Injector Diagnosis
• Water intrusion in the HO2S harness connector
• Low or high fuel system pressure, refer to Fuel System Diagnosis (LUJ) , Fuel System Diagnosis (LUV) .
• Fuel that is contaminated, refer to Alcohol/Contaminants-in-Fuel Diagnosis .
• Fuel saturation of the evaporative emission (EVAP) canister
• Exhaust leaks
• Engine vacuum leaks
• Engine oil consumption-Refer to Oil Consumption Diagnosis
• Engine coolant consumption-Refer to Loss of Coolant
• If any of the conditions exist

Repair as necessary.

• If any of the conditions exist

4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
5. Verify the DTC does not set.

• If the DTC sets

Test or replace the appropriate B52 HO2S.

• If the DTC does not set

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Heated Oxygen Sensor Replacement - Sensor 1
• Heated Oxygen Sensor Replacement - Sensor 2
• Perform the scan tool Heated Oxygen Sensor Resistance Learn Reset after replacing a heated oxygen sensor.
• Control Module References for ECM replacement, programming and setup

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