P1133
DTC P0131-P0134 or P1133 (LUW)
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 P0131
- HO2S Circuit Low Voltage Sensor 1
DTC P0132
- HO2S Circuit High Voltage Sensor 1
DTC P0133
- HO2S Slow Response Sensor 1
DTC P0134
- HO2S Circuit Insufficient Activity Sensor 1
DTC P1133
- HO2S Insufficient Switching Sensor 1
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. The control module supplies the HO2S with a reference, or bias voltage of about 450 mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1 275 mV. This voltage will fluctuate above and below the bias voltage. 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 above bias voltage toward 1 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases below bias voltage 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
DTC P0131
* DTCs P0068, P0096, P0097, P0098, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0121, P0122, P0123, P0222, P0223, P0442, P0443, P0446, P0449, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
* The ignition voltage is greater than 10 V and less than 32 V.
* The fuel system is in Closed Loop.
* The vehicle is not decelerating.
* The DTCs run continuously when the above conditions are met for greater than 3 s.
DTC P0132
* DTCs P0068, P0096, P0097, P0098, P00B3, P00B4, P00B6, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
* The ignition voltage is greater than 10 V and less than 32 V.
* The engine has been operating for greater than 50 s.
* Initial delay after engine start is greater than 10 s.
* The DTCs run continuously when the above conditions are met for greater than 3 s.
DTC P0133
* DTCs P0068, P0096, P0097, P0098, P00B3, P00B4, P00B6, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
* The ignition voltage is greater than 10 V and less than 32 V.
* The engine speed parameter is between 1 300-3 500 RPM.
* The engine coolant temperature is greater than 65°C (149°F).
* The intake air temperature is greater than -40°C (-40°F).
* The engine has been operating for greater than 100 s.
* The calculated airflow is between 10-35 g/s.
* The fuel system is in Closed Loop.
* The vehicle is not decelerating.
* The DTCs run continuously when the above conditions are met for greater than 1 s.
DTC P0134
* DTCs P0068, P0096, P0097, P0098, P00B3, P00B4, P00B6, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
* The ignition voltage is between greater than 10 V and less than 32 V.
* The engine has been operating for greater than 50 s.
DTC P1133
* DTCs P0068, P0096, P0097, P0098, P00B3, P00B4, P00B6, P00C7, P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0131, P0132, P0134, P0201, P0202, P0203, P0204, P0222, P0223, P0300, P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1516, P2101, P2119, P2135, P2176 and P2450 are not set.
* The ignition voltage is between greater than 10 V and less than 32 V.
* The engine coolant temperature is greater than 65°C (149°F).
* The intake air temperature is greater than -40°C (-40°F).
* The engine has been operating for greater than 100 s.
* The calculated airflow is between 10-35 g/s.
* The engine speed is between 1 300-3 500 RPM.
* The fuel system is in Closed Loop.
* The DTCs run continuously when the above conditions are met for greater than 1 s.
Conditions for Setting the DTC
DTC P0131
The engine control module (ECM) detects that the HO2S 1 voltage is less than 20 mV.
DTC P0132
The ECM detects that the HO2S 1 voltage is greater than 1 050 mV.
DTC P0133
The ECM detects that the HO2S 1 average response time is more than a calculated value.
DTC P0134
The ECM detects that the HO2S 1 voltage is greater than 1 700 mV.
DTC P1133
The ECM detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
Action Taken When the DTC Sets
DTCs P0131, P0132, P0133 and P1133 are Type B DTCs.
Conditions for Clearing the DTC
DTCs P0131, P0132, P0133 and P1133 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note: In extreme cold weather conditions ice may form in the vacuum source to the manifold absolute pressure sensor (MAP) and may set a DTC. Inspect the MAP sensor and the vacuum source for ice, moisture, or other restrictions.
1. Ignition ON, observe the scan tool MAP sensor pressure parameter. Start the engine, verify the scan tool MAP sensor pressure parameter changes.
• If the scan tool MAP sensor pressure parameter does not change, refer toDTC P0106, P0107, or P0108 (LUW) P0106 for further diagnosis.
2. Engine running, observe the scan tool heated oxygen sensor voltage parameters. The reading should fluctuate above and below the range of 20-1 050 mV.
3. 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 B52A Heated Oxygen Sensor 1.
2. Test for less than 5 ohm of resistance between the low reference circuit terminal 3 and ground.
• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the applicable HO2S parameter is between 350-500 mV.
• If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Install a 3 A fused jumper wire between the signal circuit and the low reference circuit. Engine running, verify the scan tool HO2S 1 parameter is less than 60 mV.
• If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
5. Verify none of the following conditions exist:
* Lean or rich fuel injectors - Refer to Fuel Injector Diagnosis Fuel Injector Diagnosis.
* Water intrusion in the HO2S harness connector
* Low or high fuel system pressure - Refer to Fuel System Description Fuel System Description.
* Fuel that is contaminated - Refer to Alcohol/Contaminants-in-Fuel Diagnosis Testing and Inspection.
* Fuel saturation of the evaporative emission (EVAP) canister
* Exhaust leaks near the HO2S
* Engine vacuum leaks
• If you find any of the above conditions, repair as necessary.
6. If all circuits test normal, test or replace B52A Heated Oxygen Sensor 1.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Heated Oxygen Sensor Replacement - Sensor 1 (LDE, LXV, LUW, 2H0) Heated Oxygen Sensor Replacement - Sensor 1
* Control Module References Control Module References for ECM replacement, programming and setup