SFI SYSTEM, Diagnostic DTC:P0133, P0153

DTC Code DTC Name
P0133 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0153 Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1)

DESCRIPTION

The heated oxygen sensor is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air-fuel mixture must be maintained near the ideal stoichiometric air-fuel ratio. The heated oxygen sensor output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The heated oxygen sensor generates a voltage between 0.1 and 0.9 V in response to oxygen concentration in the exhaust gas.

If the oxygen concentration in the exhaust gas increases, the air-fuel ratio is called LEAN. The heated oxygen sensor voltage drops below 0.45 V, which informs the ECM of the LEAN condition.

If oxygen is not in the exhaust gas, the air-fuel ratio is called RICH. The heated oxygen sensor voltage increases above 0.45 V, which informs the ECM of the RICH condition.

A01GMH6E04

Tech Tips

The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated oxygen sensor heater circuit uses a relay on the +B side of the circuit.

A01GIATE05
DTC No. DTC Detection Condition Trouble Area

P0133

P0153

Slow slope condition (2 trip detection logic):

Heated oxygen sensor (sensor 1) does not switch between LEAN and RICH for 0.9 seconds

LEAN: 0.4 V or less

RICH: 0.55 V or more

Frequency condition (2 trip detection logic):

Time of heated oxygen sensor (sensor 1) frequency per one cycle is 0.8 seconds or more.

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

  • Heated oxygen sensor (sensor 1)

  • A/F relay

  • Air induction system

  • Fuel pressure

  • Injector

  • ECM

MONITOR DESCRIPTION

The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to the stoichiometric air-fuel ratio. This maximizes the catalytic converter's ability to purify the exhaust gases. The sensor detects oxygen levels in the exhaust gas and sends a signal to the ECM.

The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element is exposed to the exhaust gases. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The heated oxygen sensor's output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates waveforms of a voltage between 0.1 V and 0.9 V in response to the oxygen concentration in the exhaust gas. When the heated oxygen sensor voltage is 0.45 V or more, the ECM judges that the air-fuel ratio is RICH. When it is 0.45 V or less, the ECM judges that the air-fuel ratio is LEAN. The ECM monitors the response feature of the heated oxygen sensor. If the response time of the heated oxygen sensor status change from RICH to LEAN (or vice versa) becomes longer, the ECM interprets this as a malfunction in the heated oxygen sensor and sets a DTC.

A01GN52E13
A01GHT9E03

WIRING DIAGRAM

A01GIYME03

CONFIRMATION DRIVING PATTERN

A01GINPE09

Note

If the conditions in this test are not strictly followed, you should perform steps "d" and "e".

If you do not have the intelligent tester, turn the engine switch off after performing steps "c" to "f", and then perform steps "c" to "f" again.

INSPECTION PROCEDURE

Tech Tips

It is possible the malfunctioning area can be found using the Active Test Control operation. The Active Test can determine if the heated oxygen sensor or other potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5% (decrease) or +24.8% (increase) by the Active Test.

The Active Test procedure enables a technician to check and graph the voltage outputs of the heated oxygen sensors.


Tech Tips


  • The Control the Injection Volume operation lowers the fuel injection volume by 12.5% or increases the injection volume by 24.8%.

  • Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Tester Display Injection Volume Status Voltage
O2S B1S1 or O2S B2S1 +24.8% Rich More than 0.55 V
O2S B1S1 or O2S B2S1 -12.5% Lean Less than 0.4 V
O2S B1S2 or O2S B2S2 +24.8% Rich More than 0.5 V
O2S B1S2 or O2S B2S2 -12.5% Lean Less than 0.4 V

Note

The heated oxygen sensor (sensor 1) output has a few seconds of delay and the heated oxygen sensor (sensor 2) output has a maximum of 20 seconds of delay.

If the vehicle is short on fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded.

Case Front HO2 Sensor (Sensor 1) Output Voltage Rear HO2 Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area
1 A01GHX3E16 A01GJQ7E01 A01GHX3E16 A01GKFWE02 -
2 A01GHX3E16 A01GJHVE01 A01GHX3E16 A01GKFWE02

  • Front HO2 sensor

  • Front HO2 sensor heater

  • Front HO2 sensor circuit
3 A01GHX3E16 A01GJQ7E01 A01GHX3E16 A01GJHVE01

  • Rear HO2 sensor

  • Rear HO2 sensor heater

  • Rear HO2 sensor circuit
4 A01GHX3E16 A01GJHVE01 A01GHX3E16 A01GJHVE01

  • Injector

  • Fuel pressure

  • Gas leakage from exhaust system (Air-fuel ratio extremely rich or lean)

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

  • Bank 1 refers to the bank that includes No. 1 cylinder.

  • Bank 2 refers to the bank that does not include No. 1 cylinder.

  • Cylinder No. 1 is located in the front part of the engine, opposite the transmission.

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

PROCEDURE


  1. CHECK OTHER DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Enter the following menus: Powertrain / Engine / DTC.

    3. Read the DTCs.

      Result
      Display (DTC output) Proceed to
      P0133 or P0153 A
      P0133 or P0153 and other DTCs B

    B

    GO TO RELEVANT DTC CHART Click here

    A

  2. READ DATA LIST (HEATED OXYGEN SENSOR (SENSOR 1) VOLTAGE)


    1. Connect the intelligent tester to the DLC3.

    2. Enter the following menus: Powertrain / Engine / Data List / Primary / O2S B1S1 (or O2S B2S1).

    3. Allow the engine to run for 90 seconds at 2500 rpm.

    4. Read the heated oxygen sensor voltage while the engine is idling.

      OK
      The heated oxygen sensor voltage alternates between less than 0.4 V and more than 0.55 V, and the period "t" must be less than 0.9 seconds (see the following table).
      A01GMU4E03
      Result
      Result Proceed to
      NG A
      OK B

    B

    PERFORM CONFIRMATION DRIVING PATTERN Click here

    A

  3. INSPECT HEATED OXYGEN SENSOR

    A01GJX6E02

    1. Disconnect the E56 and E57 sensor connectors.

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

      Standard resistance
      Tester Connection Specified Condition Specified Condition
      1 (HT1A) - 2 (+B) Always 11 to 16 Ω
      1 (HT2A) - 2 (+B) Always 11 to 16 Ω
      1 (HT1A) - 4 (E2) Always 10 kΩ or higher
      1 (HT2A) - 4 (E2) Always 10 kΩ or higher

    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  4. INSPECT ENGINE ROOM NO. 2 JUNCTION BLOCK (A/F RELAY)

    A01GKYIE01

    1. Remove the terminal cover.

    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      +B - Body ground Always 11 to 14 V
      A/F - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPLACE ENGINE ROOM NO. 2 JUNCTION BLOCK

    OK

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

    A01GN9GE01

    1. Disconnect the E56 and E57 sensor connectors.

    2. Disconnect the E1 and E3 ECM connectors.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E56-1 (HT1A) - E3-3 (HT1A) Always Below 1 Ω
      E56-3 (OX1A) - E3-28 (OX1A) Always Below 1 Ω
      E57-1 (HT2A) - E3-2 (HT2A) Always Below 1 Ω
      E57-3 (OX2A) - E3-27 (OX2A) Always Below 1 Ω
      E56-4 (E2) - E1-28 (E2) Always Below 1 Ω
      E57-4 (E2) - E1-28 (E2) Always Below 1 Ω
      E56-1 (HT1A) or E3-3 (HT1A) - Body ground Always 10 kΩ or higher
      E56-3 (OX1A) or E3-28 (OX1A) - Body ground Always 10 kΩ or higher
      E57-1 (HT2A) or E3-2 (HT2A) - Body ground Always 10 kΩ or higher
      E57-3 (OX2A) or E3-27 (OX2A) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leaks.

      OK
      There are no vacuum leaks in air induction system.

    NG

    REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK

  7. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    REPAIR OR REPLACE FUEL SYSTEM

    OK

  8. INSPECT FUEL INJECTOR


    1. Check the injector injection [whether fuel volume is high or low, and whether injection pattern is poor] Click here.


    NG

    REPLACE FUEL INJECTOR Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here

  9. PERFORM CONFIRMATION DRIVING PATTERN

    Tech Tips

    Clear all DTCs before performing the confirmation driving pattern.


    NEXT

  10. READ OUTPUT DTC (DTC P0133 OR P0153 IS OUTPUT AGAIN)


    1. Start the engine and allow the engine to idle for 15 seconds or more.

    2. Read the DTC.

      Result
      Display (DTC output) Proceed to
      P0133 or P0153 A
      No DTC output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

    REPLACE HEATED OXYGEN SENSOR Click here