СИСТЕМА SFI, Diagnostic DTC:P0133, P0153

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.

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.

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

• (a) Connect the intelligent tester to the DLC3.

• (b) Switch the intelligent tester from normal mode to check mode Click here.

• (c) Allow the engine to idle until the ECT reaches 75°C (167°F).

• (d) Allow the vehicle to run at 40 km/h (25 mph) or more for 25 seconds or more.

• (e) Allow the engine to idle for 30 seconds or more.

• (f) Perform the 2 previous steps at least 3 times.

  Tech Tips

  If a malfunction exists, the MIL will be illuminated on the multi-information display.

• (g) Allow the engine to idle for 30 seconds.

INSPECTION PROCEDURE

• Procedure:




1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG).

3. Warm up the engine by running the engine at 2500 rpm for approximately 90 seconds.

4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.

5. Perform the Active Test while the engine is idling.

6. Monitor the output voltages of the HO2 sensors (O2S B1S1 and O2S B1S2 or O2S B2S1 and O2S B2S2) displayed on the tester.

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).

      

      Result

      Result	Proceed to
      NG	A
      OK	B

   
   

   B

   PERFORM CONFIRMATION DRIVING PATTERN Click here

   A

3. INSPECT HEATED OXYGEN SENSOR

   

   
   

   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)

   

   
   

   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)

   

   
   

   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