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Home >> Scion >> 2004 >> xA Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnosis >> DTC P0133: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1) >> Inspection Procedure

Inspection Procedure

NOTE: Hand-held tester only:

Narrowing down the Trouble Area is possible by performing the "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other Trouble Areas can be distinguished).

  1. Perform ACTIVE TEST using the hand-held tester (A/F CONTROL).
    NOTE: "A/F CONTROL" is ACTIVE TEST which changes the injection volume -12.5 % or +25 %.
    1. Connect the hand-held tester to the DLC3 on the vehicle.
    2. Turn the ignition switch ON.
    3. Warm up the engine by running the engine at 2,500 rpm for approximately 3 minutes.
    4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/ A/F CONTROL".
    5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

      Result: 

      Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: 

      +25 % --> rich output: More than 0.55 V 

      -12.5 % --> lean output: Less than 0.4 V 

    NOTE: There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).
    Fig 1: Heated Oxygen Sensor'S Output Voltage Chart
    G03367066Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    The following A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

    For displaying the graph indication, enter "ACTIVE TEST / A/F CONTROL / USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

    NOTE: If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and DTC P0133 will be recorded, and the MIL then comes on.
    NOTE:
    • If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
    • Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
    • A high heated oxygen sensor (sensor 1) voltage (0.55 V or more) 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 (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0133) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
    3. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      DTCS OUTPUT

      Display (DTC Output) Proceed To
      Only "P0133" Is Output A
      "P0133" And Other DTCs Are Output B
      NOTE: If any other codes besides "P0133" is output, perform the troubleshooting for those DTCs first.
    1. B : GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART  ) 
    2. A : Go to next step. 
  2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (HEATED OXYGEN SENSOR DURING IDLING) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON.
    3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S1".
    4. Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 90 seconds.
    5. Read the output voltage of the heated oxygen sensor during idling.

      Heated oxygen sensor output voltage: 

      Alternates between less than 0.4 V and more than 0.55 V, and period of "t" must exist less than 0.9 seconds (See the following table). 

      Fig 2: Heated Oxygen Sensor Output Voltage Cycle Diagram
      G03367067Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK : Go to step   9 . 
    2. NG : Go to next step. 
  3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) 
    1. Disconnect the H3 heated oxygen sensor connector.
      2. Fig 3: Identifying H3 Heated Oxygen Sensor Connector
      G03367068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals of the heated oxygen sensor connector.

      Standard: 

      RESISTANCE

      Tester Connection Specified Condition
      HT (H3-1) - +B (H3-2) 11 to 16 Ω at 20 °C (68 °F)
      HT (H3-1) - E1 (H3-4) 10 kΩ Or Higher
    3. Reconnect the heated oxygen sensor connector.
    1. NG : REPLACE HEATED OXYGEN SENSOR 
    2. OK : Go to next step. 
  4. INSPECT EFI RELAY 
    1. Remove the EFI relay from the engine room R/B.
    2. Inspect the EFI relay.

      Standard: 

      STANDARD

      Tester Connection Specified Condition
      1 - 2 Continuity
      3 - 5 No Continuity
      Continuity (Apply Battery Voltage To Terminals 1 & 2)
    3. Reinstall the EFI relay.
      Fig 4: EFI Relay Connecting Diagram
      G03367069Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE EFI RELAY 
    2. OK : Go to next step. 
  5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) 
    1. Disconnect the H3 heated oxygen sensor connector.
      2. Fig 5: Identifying H3 Heated Oxygen Sensor Connector
      G03367070Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E4 ECM connector.
      3. Fig 6: Identifying E4 ECM Connector
      G03367071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance between the wire harness side connectors.

      Standard (Check for open): 

      STANDARD (CHECK FOR OPEN)

      Tester Connection Specified Condition
      HT (H3-1) - HTL (E4-4) Below 1 Ω
      OX (H3-3) - OXL1 (E4-23)

      Standard (Check for short): 

      STANDARD (CHECK FOR SHORT)

      Tester Connection Specified Condition
      HT (H3-1) or HTL (E4-4) - Body Ground 10 kΩ Or Higher
      OX (H3-3) or OXL1 (E4-23) - Body Ground
    4. Reconnect the heated oxygen sensor connector.
      5. Fig 7: Heated Oxygen Sensor Connector Connecting Diagram
      G03367072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Reconnect the ECM connector.
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : Go to next step. 
  6. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leaks.
    1. NG : REPAIR OR REPLACE AIR INDUCTION SYSTEM 
    2. OK : Go to next step. 
  7. CHECK FUEL PRESSURE (See  ON-VEHICLE INSPECTION  ) 
    1. Check the fuel pressure (high or low pressure).
    1. NG : REPAIR OR REPLACE FUEL SYSTEM 
    2. OK : Go to next step. 
  8. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) (See  INSPECTION  ) 
    1. NG : REPLACE FUEL INJECTOR ASSY 
    2. OK : REPLACE HEATED OXYGEN SENSOR 
  9. PERFORM CONFIRMATION DRIVING PATTERN (See  DTC CHECK/CLEAR   6) 
    NOTE: Clear all DTCs prior to performing the confirmation driving pattern.
    1. GO 
  10. READ OUTPUT DTC (DTC P0133 IS OUTPUT AGAIN) 
    1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
    2. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.
    3. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      RESULT

      Display (DTC Output) Proceed To
      "P0133" Is Output Again A
      "P0133" Is Not Output Again B
    1. B : CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    2. A : REPLACE HEATED OXYGEN SENSOR 
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