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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 0.5 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 Voltage Chart
    G03367073Courtesy 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 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 (0.5 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 IN DTC P0134) 
    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. Select the item "DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES".
    4. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      DTCS OUTPUT

      Display (DTC output) Proceed to
      Only "P0134" Is Output A
      "P0134" And Other DTCs Are Output B
      NOTE: If any other codes besides "P0134" 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 (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) 
    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. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S1".
    4. Warm up the engine above 75°C (169°F).
    5. Read the output voltage of the heated oxygen sensor when the engine speed is suddenly increased.
      NOTE: Quickly accelerate the engine to 4,000 rpm 3 times by using the accelerator pedal.

      Standard: 

      Heated oxygen sensor outputs a RICH signal (0.45 V or more) at least once. 

    1. OK : Go to step   12 . 
    2. NG : Go to next step. 
  3. CHECK CONNECTION OF PCV HOSE 
    1. NG : REPAIR OR REPLACE PCV HOSE 
    2. OK : Go to next step. 
  4. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) 
    1. Disconnect the H3 heated oxygen sensor connector.
      2. Fig 2: Identifying H3 Heated Oxygen Sensor Connector
      G03367074Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance between the terminals of the heated oxygen sensor connector.

      Standard: 

      STANDARD

      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. 
  5. 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 3: EFI Relay Connecting Diagram
      G03367075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPLACE EFI RELAY 
    2. OK : Go to next step. 
  6. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) 
    1. Disconnect the H3 heated oxygen sensor connector.
      2. Fig 4: Identifying E4 ECM Connector
      G03367076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E4 ECM connector.
    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 (E7-4) - Body Ground 10 kΩ Or Higher
      OX (H3-3) or- OXL1 (E4-23) - Body Ground
    4. Reconnect the heated oxygen sensor connector.
    5. Reconnect the ECM connector.
      Fig 5: H3 Heated Oxygen Sensor Connector Connecting Diagram
      G03367077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 6: EFI Relay Connecting Diagram
      G03367078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK : Go to next step. 
  7. CHECK WHETHER MISFIRE IS OCCURRED OR NOT BY MONITORING DTC AND DATA LIST 
    1. NG : PERFORM TROUBLESHOOTING FOR MISFIRE (See  BASIC INSPECTION  9) 
    2. OK : Go to next step. 
  8. 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. 
  9. 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. 
  10. INSPECT INJECTOR SET, FUEL (INJECTION AND VOLUME) (See  INSPECTION  ) 
    1. NG : REPLACE INJECTOR SET, FUEL 
    2. OK : Go to next step. 
  11. CHECK FOR EXHAUST GAS LEAKS 
    1. NG : REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT 
    2. OK : REPLACE HEATED OXYGEN SENSOR 
  12. PERFORM CONFIRMATION DRIVING PATTERN (See  DTC CHECK/CLEAR  6) 
    NOTE: Clear all DTCs prior to performing the confirmation driving pattern.
    1. GO 
  13. READ OUTPUT DTC (DTC P0134 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. Select the item "DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES".
    4. Read the DTCs using the hand-held tester or the OBD II scan tool.

      Result: 

      RESULT

      Display (DTC Output) Proceed to
      "P0134" Is Not Output Again A
      "P0134" Is Output Again B
    1. B : REPLACE ECM (See  REPLACEMENT  ) 
    2. A : Go to next step. 
  14. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST 
    1. NO : CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    2. YES : DTC IS CAUSED BY RUNNING OUT OF FUEL 
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