SFI SYSTEM, Diagnostic DTC:P0133

DTC Code DTC Name
P0133 O2 Sensor Circuit Slow Response Bank 1 Sensor 1

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0133 O2 Sensor Circuit Slow Response Bank 1 Sensor 1

DTC Detection Condition


    Enable Criteria

  • Engine load between 20 - 62%

  • Engine speed between 1284 - 3512 rpm

  • Engine run time 200 seconds or more

  • Coolant temperature 60°C (140°F) or higher

  • Closed loop fuel control active


    Malfunction Criteria (1)

  • Average lean to rich sensor switch time is over 300ms.

  • Average rich to lean sensor switch time is over 250ms.

  • Diagnostic test measured over 30 sensor switches or the number of switches measured in 130 seconds


    Malfunction Criteria (2)

  • Rich to lean / Lean to rich switch time ratio is large.

  • Average rich to lean sensor switch time is over 90ms.

  • Diagnostic test measured over 30 sensor switches or the number of switches measured in 130 seconds


    Malfunction Criteria (3)

  • Rich to lean / Lean to rich switch time ratio is little.

  • Average lean to rich sensor switch time is over 90ms.

  • Diagnostic test measured over 30 sensor switches or the number of switches measured in 130 seconds


    Malfunction Criteria (4)

  • Sensor does not record a lean to rich or rich to lean switch during 130 seconds diagnostic test


    Diagnostic Mask

  • The MIL will be illuminated if these faults are present for 2 consecutive trips


    Monitor

  • Continuous


    Potential failure modes

  • Oxygen sensor connector and wiring should be checked for corrosion and loose connections

  • Oxygen sensor contaminated, possibly from fuel, improper use of RTV, engine oil or coolant

  • Open or short in heated oxygen sensor (sensor 1) circuit

  • Heated oxygen sensor (sensor 1)

  • Fuel pressure

  • Fuel injector assembly

  • Gas leakage from exhaust system

 Comes on DTC stored

Tech Tips

Rich-Lean cycle

B0047QRE01

MONITOR DESCRIPTION

The oxygen sensor is electrically heated to improve response after start.

The sensor consists of a zirconia electrode between two platinum plates. When zirconia comes into contact with oxygen, it becomes an electrical conductor. The exhaust gases pass through louvers in the sensor. One plate is in contact with the outside air and the other plate is in contact with the exhaust gases. The platinum plate in contact with the air is electrically negative due to the oxygen in the atmosphere and the plate in contact with the exhaust gases is electrically positive. This will cause a difference in electrical potential to develop between the two plates. Thus the voltage across the platinum plates ranges approximately from 100 millivolts to 900 millivolts, depending on the oxygen content of the exhaust gases. Thus when the air/fuel mixture is rich, the oxygen sensor output will be high. If the air/fuel mixture is lean, the oxygen sensor output will be low.

WIRING DIAGRAM

Refer to DTC P0131.

Click here

CAUTION / NOTICE / HINT

Tech Tips


  • A high heated oxygen sensor voltage (0.55 V or more) in most time could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.

  • A low heated oxygen sensor voltage (0.4 V or less) in most time could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

  • Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO DTC P0133)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0133 is output A
      DTC P0133 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0133 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM)


    1. Disconnect the B37 heated oxygen sensor (sensor 1) connector.

    2. Disconnect the B142 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B37-3 (A1A+) - B142-19 (A1A+) Always Below 1 Ω
      B37-1 (HA1A) - B142-20 (HA1A) Always Below 1 Ω
      B37-4 (A1A-) - B142-33 (A1A-) Always Below 1 Ω
      B37-3 (A1A+) or B142-19 (A1A+) - Body ground and other terminals Always 10 kΩ or higher
      B37-1 (HA1A) or B142-20 (HA1A) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE HEATED OXYGEN SENSOR (SENSOR 1)


    1. Replace the heated oxygen sensor (sensor 1).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0133)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Start the engine and warm it up.

    7. Using the GTS, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored.

    8. Turn the GTS on.

    9. Enter the following menus: Powertrain / Engine / Trouble Codes.

    10. Read the DTCs.

      Result
      Result Proceed to
      DTCs are not output A
      DTC P0133 is output B

    A

    END

    B

  5. CHECK WHETHER MISFIRE OCCURS


    1. Check the idling condition.

      OK
      Rough idling does not occur.
      Result
      Proceed to
      OK
      NG

    NG

    TROUBLESHOOT MISFIRE Click here

    OK

  6. CHECK FUEL PRESSURE


    1. Check the fuel pressure.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE FUEL SYSTEM

    OK

  7. INSPECT FUEL INJECTOR ASSEMBLY (INJECTION AND VOLUME)


    1. Check the injector volume.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR EXHAUST GAS LEAK

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here