LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System (SFI) - Diagnostics (2AZ-FE)) >> DTC P0136, P0137, P0138: Oxygen Sensor Circuit (Bank 1 Sensor 2) >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT:

Hand-held tester only:

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

  1. Perform the ACTIVE TEST A/F CONTROL operation.

    HINT:

    The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 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 90 seconds.
    4. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL.
    5. Perform the A/F CONTROL operation with the engine idle (press the right or left button).

Result: 

A/F sensor reacts in accordance with increase and decrease of injection volume: 

+25 % --> rich output: Less than 3.0 V 

-12.5 % --> lean output: More than 3.35 V 

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: The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay at maximum.
Fig 1: Hand Held Tester Active Test Result Chart
G02907822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

For displaying the graph, enter "ACTIVE TEST/A/F CONTROL/USER DATA", select "AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then press "F4".

HINT:

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, 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.

  1. CHECK OTHER DTC OUTPUT 
    1. Read the DTC using the hand-held tester or the OBD II scan tool.

      Result: 

      DTC RESULT

      Display (DTC Output) Proceed to
      P0138 is output A
      P0137 is output B
      P0136 is output C

    HINT:

    If any other codes besides P0136, P0137 and/or P138 are output, perform the troubleshooting for those codes first.

    1. B: Go to step   9 
    2. C: Go to step   6 
    3. 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 ON the ignition switch. Push the hand-held tester or the OBD II scan tool main switch ON.
    3. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S2.
    4. Run the engine at idle.
    5. Read the output voltage of the heated oxygen sensor during idling.
    HEATED OXYGEN SENSOR OUTPUT VOLTAGE SPECIFICATIONS

    Heated oxygen sensor output voltage Proceed to
    More than 1.2 V A
    Less than 1.0 V B
    1. B: READ OUTPUT DTC 
    2. A: GO TO NEXT STEP. 
  3. CHECK WIRE HARNESS (CHECK FOR SHORT) 
    1. Turn the ignition switch OFF and wait for 5 minutes.
    2. Disconnect the E8 ECM connector.
    3. Measure the resistance of the wire harness side connectors.
      Fig 2: Identifying E8 ECM Connector Terminals
      G02907823Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      E8-21 (HT1B) - E8-29 (OX1B) No continuity
      E8-21 (HT1B)- E8-2 (O1B-) No continuity
    1. OK: REPLACE ECM (See  REPLACEMENT  ) 
    2. NG: GO TO NEXT STEP. 
  4. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT) 
    1. Disconnect the H10 heated oxygen sensor connector.
    2. Measure the resistance of the sensor side connectors.
      Fig 3: Identifying HO2S Connector Terminals
      G02907824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      H10-1 (+B)- H10-3 (E1) 10 kΩ or higher
      H10-1 (+B)- H10-4 (OX) 10 kΩ or higher
    1. OK: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. NG: REPLACE HEATED OXYGEN SENSOR 
  5. READ OUTPUT PTC (CHECK MODE) 
    1. Change the ECM to check mode with the hand-held tester.

      Enter the following menus: DIAGNOSIS/ENHANCED OBD II/CHECK MODE.

    2. Warm up the engine and drive the vehicle at over 25 mph (40 km/h) for an accumulated total of 10 minutes.

      HINT:

      The 10 minutes of driving should be driven in one instance, but it is not necessary to maintain a speed of 25 mph (40 km/h) for 10 minutes consecutively.

    3. Read the DTC.

      Result: 

      DTC RESULT

      Display (DTC output) Proceed to
      P0136 is output A
      No DTC B
    1. B: CHECK FOR INTERMITTENT PROBLEMS (See  CHECK FOR INTERMITTENT PROBLEMS  ) 
    2. A: REPLACE HEATED OXYGEN SENSOR 
  6. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) 
    1. After warming up the engine, run the engine at 2,500 rpm for 3 minutes.
    2. Read the output voltage of the heated oxygen sensor when the engine rpm is suddenly increased.

      HINT:

      Quickly accelerate the engine to 4,000 rpm 3 times by using the accelerator pedal.

      Heated oxygen sensor output voltage: Alternates 0.4 V or less and 0.5 V or more. 

    1. OK: Go to step   10 
    2. NG: GO TO NEXT STEP. 
  7. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) 
    1. Disconnect the H10 heated oxygen sensor connector.
    2. Measure the resistance of the heated oxygen sensor terminals.
      Fig 4: Identifying HO2S Connector Terminals
      G02907825Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Condition Specified Condition
      H10-1 (+B) - H10-2 (HT) 20°C (68°F) 11 to 16 Ω
      H10-1 (+B) - H10-2 (HT) 800°C (1,472°F) 23 to 32 Ω
    1. NG: REPLACE HEATED OXYGEN SENSOR 
    2. OK: GO TO NEXT STEP. 
  8. INSPECT RELAY (EFI) 
    1. Remove the EFI relay from the engine room J/B.
    2. Measure the resistance of the EFI relay.
      Fig 5: Identifying EFI Relay Terminals
      G02907826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION AND CONDITION SPECIFICATIONS

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω(when battery voltage is applied to terminals 1 and 2)
    1. NG: REPLACE RELAY 
    2. OK: GO TO NEXT STEP. 
  9. CHECK WIRE HARNESS 
    1. Check the wire harness between the ECM and heated oxygen sensor.
      1. Disconnect the H10 heated oxygen sensor connector.
      2. Disconnect the E8 ECM connector.
      3. Measure the resistance of the wire harness side connectors.
        Fig 6: Identifying HO2S & ECM Connector Terminals
        G02907827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard: 

        TESTER CONNECTION AND CONDITION SPECIFICATIONS

        Tester Connection Specified Condition
        H10-2 (HT)- E8-21 (HT1B) H10-4 (OX)- E8-29 (OX1B) Below 1 Ω
        H10-2 H10-4 (HT) or E8-21 (HT1B) - Body ground (OX) or E8-29 (OX1B) - Body ground 10 kΩ or higher
        Fig 7: Bank 1 Sensor 2 System Drawing
        G02907828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE HEATED OXYGEN SENSOR 
  10. PERFORM CONFIRMATION DRIVING PATTERN 

    HINT:

    Clear all DTCs prior to performing the confirmation driving pattern.

  11. READ OUTPUT PTC (PTC P0136 IS OUTPUT AGAIN) 
    1. Read the DTC using the hand-held tester or the OBD II scan tool.

      Result: 

      DTC RESULT

      Display (DTC Output) Proceed to
      P0136 is not output again A
      P0136 is output again B
    1. A: CHECK FOR INTERMITTENT PROBLEMS 
    2. B: GO TO NEXT STEP. 
  12. REPLACE HEATED OXYGEN SENSOR 
    1. GO TO NEXT STEP. 
  13. PERFORM CONFIRMATION DRIVING PATTERN 

    HINT:

    Clear all DTCs prior to performing the confirmation driving pattern.

    1. GO TO NEXT STEP. 
  14. REAP OUTPUT PTC (PTC P0136 IS OUTPUT AGAIN) 
    1. Read the DTC using the hand-held tester or the OBD II scan tool.

      Result: 

      DTC RESULT

      Display (DTC Output) Proceed to
      P0136 is not output again A
      P0136 is output again B
    1. A: REPAIR COMPLETED 
    2. B: GO TO NEXT STEP. 
  15. PERFORM ACTIVE TEST USING HAND-HELD TESTER 
    1. Start the engine and warm it up.
    2. Connect the hand-held tester to the DLC3.
    3. Turn ON the ignition switch and the hand-held tester main switch.
    4. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/INJ VOL.
    5. Using the hand-held tester, change the injection volume to check the A/F sensor output and heated oxygen sensor output values below.

    HINT:

    Change the injection volume from -12.5 % to +12.5 %.

    Result: A/F sensor output remains more than 3.3 V or A/F sensor output remains less than 3.3 V (Heated oxygen sensor reacts in accordance with increase and decrease of injection volume) 

    Fig 8: Active Test Graphical Representation
    G02907829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: REPLACE AIR FUEL RATIO SENSOR 
    2. NG: CHECK AND REPLACE EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (INJECTOR, FUEL PRESSURE, GAS LEAKAGE IN EXHAUST SYSTEM, ETC.) 
scientia non olet · About LEMON Manuals