СИСТЕМА SFI, Diagnostic DTC:P0136, P0137, P0138

DTC Code DTC Name
P0136 Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0137 Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0138 Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

DESCRIPTION

Tech Tips

Sensor 2 refers to the sensor mounted behind the three-way catalytic converter and located far from the engine assembly.

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxide (NOx) components in the exhaust gas, a three-way catalytic converter is used. For the most efficient use of the three-way catalytic converter, the air fuel ratio must be precisely controlled so that it is always close to the stoichiometric air fuel level. For the purpose of helping the ECM to deliver accurate air fuel ratio control, a heated oxygen sensor is used.

The heated oxygen sensor is located behind the three-way catalytic converter, and detects the oxygen concentration in the exhaust gas. Since the sensor is integrated with the heater that heats the sensing portion, it is possible to detect the oxygen concentration even when the intake air volume is low (the exhaust gas temperature is low).

When the air fuel ratio becomes lean, the oxygen concentration in the exhaust gas is rich. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is lean (low voltage, i.e. less than 0.45 V).

Conversely, when the air fuel ratio is richer than the stoichiometric air fuel level, the oxygen concentration in the exhaust gas becomes lean. The heated oxygen sensor informs the ECM that the post-three-way catalytic converter air fuel ratio is rich (high voltage, i.e. more than 0.45 V). The heated oxygen sensor has the property of changing its output voltage drastically when the air fuel ratio is close to the stoichiometric level.

The ECM uses the supplementary information from the heated oxygen sensor to determine whether the air fuel ratio after the three-way catalytic converter is rich or lean, and adjusts the fuel injection time accordingly. Thus, if the heated oxygen sensor is working improperly due to internal malfunctions, the ECM is unable to compensate for deviations in the primary air fuel ratio control.

A01CCOEE01
for Models w/ CVT (w/o Euro-OBD)
DTC No.

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P0136

  1. Both conditions are met:


    1. The engine is warm (coolant temperature is 95°C (203°F) or more).

    2. The heated oxygen sensor heater has operated for 22 seconds or more.

  2. Either condition is met:


    1. No rich signals are received during feedback control (sensor output voltage is always below 0.6 V).

    2. No lean signals are received during feedback control (sensor output voltage is always above 0.45 V).

  3. 480 seconds

  4. 2 trip detection logic

  • Open or short in heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Heated oxygen sensor heater (sensor 2)

  • Gas leaks from exhaust system

  • Fuel injector assembly

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Emission control system

  • Intake system

  • Ignition system

  • Air fuel ratio sensor (sensor 1)

  • Fuel pump

  • Fuel line

  • ECM
for Other Models
DTC No. DTC Detection Condition Trouble Area
P0136

  • Abnormal voltage output:

    During active air fuel ratio control, following conditions (a) and (b) are met for certain period of time (2 trip detection logic):


    • (a) Heated oxygen sensor voltage does not decrease to less than 0.21 V


    • (b) Heated oxygen sensor voltage does not increase to more than 0.69 V

  • Open or short in heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Heated oxygen sensor heater (sensor 2)

  • Air fuel ratio sensor (sensor 1)

  • Gas leaks from exhaust system

  • ECM
P0137

  • Low voltage (open):

    During active air fuel ratio control, following conditions (a) and (b) are met for certain period of time (2 trip detection logic):


    • (a) Heated oxygen sensor voltage output less than 0.21 V


    • (b) Target air fuel ratio rich

  • Open in heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Heated oxygen sensor heater (sensor 2)

  • Air fuel ratio sensor (sensor 1)

  • Gas leaks from exhaust system

  • ECM
P0138

  • High voltage (short):

    During active air fuel ratio control, following conditions (a) and (b) are met for certain period of time (2 trip detection logic):


    • (a) Heated oxygen sensor voltage output 0.69 V or more


    • (b) Target air fuel ratio lean

  • Short in heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Air fuel ratio sensor (sensor 1)

  • ECM

WIRING DIAGRAM

A01CFW5E01

CONFIRMATION DRIVING PATTERN

for Models w/ CVT (w/o Euro-OBD)
A01CF2YE21

  1. Connect the intelligent tester to the DLC3.

  2. Turn the engine switch on (IG) and turn the tester to on.

  3. Clear the DTCs Click here.

  4. Turn the engine switch off. [Step A]

  5. Turn the engine switch on (IG) and turn the tester on.

  6. Start the engine and allow it to idle for 60 seconds or more. [Step B]

  7. Drive the vehicle at a vehicle speed of 40 km/h (25 mph) or more for 40 seconds or more. [Step C]

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  8. Allow the engine to idle for 10 seconds or more. [Step D]

  9. Repeat steps [C] and [D] 10 times.

  10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  11. Input the DTC: P0136.

  12. Check the DTC judgment result. [Step E]

    Tester Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [C] and [D] 10 times.

  13. If the test result is N/A, enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

  14. Read the Pending DTCs.

    Tech Tips

    If a pending DTC is output, the system is malfunctioning.

for Other Models
A01CDCIE47

  1. Connect the intelligent tester to the DLC3.

  2. Turn the engine switch on (IG) and turn the tester to on.

  3. Clear the DTCs Click here.

  4. Turn the engine switch off.

  5. Turn the engine switch on (IG) and turn the tester on [A].

  6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].

  7. With the transmission in 4th gear or more, drive the vehicle at 60 to 120 km/h (37 to 75 mph) for 10 minutes or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  8. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  9. Input the DTC: P0136, P0137, P0138.

  10. Check the DTC judgment result [D].

    Tester Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    Tech Tips


    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [C] and [D].

  11. If the test result is N/A, enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

  12. Read the Pending DTCs.

    Tech Tips

    If a pending DTC is output, the system is malfunctioning.

INSPECTION PROCEDURE

Tech Tips

Intelligent tester only:

Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the intelligent tester.


  1. Connect the intelligent tester to the DLC3.

  2. Start the engine and turn the tester on.

  3. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.

  4. On the tester, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.

  5. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).

  6. Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the tester.

Tech Tips


  • The "Control the Injection Volume for A/F Sensor" operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.

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

Tester Display (Sensor) Injection Volume Status Voltage

AFS Voltage B1S1

(Air fuel ratio)

 +25% Rich Less than 3.1 V
-12.5% Lean More than 3.4 V

O2S B1S2

(Heated oxygen)

 +25% Rich More than 0.55 V
-12.5% Lean Less than 0.4 V

Note

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

Case

Air Fuel Ratio Sensor (Sensor 1)

Output Voltage

Heated Oxygen Sensor (Sensor 2)

Output Voltage

 Main Suspected Trouble Area
1 A01CDKHE08 A01CCPYE01 -
2 A01CD73E03 A01CCPYE01

  • Air fuel ratio sensor

  • Air fuel ratio sensor heater

  • Air fuel ratio sensor circuit
3 A01CDKHE08 A01CD73E03

  • Heated oxygen sensor

  • Heated oxygen sensor heater

  • Heated oxygen sensor circuit
4 A01CD73E03 A01CD73E03

  • Fuel pressure

  • Gas leakage from exhaust system

    (Air fuel ratio extremely lean or rich)

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

PROCEDURE


  1. READ OUTPUT DTC (DTC P0136, P0137 OR P0138)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0138 is output A
      DTC P0137 is output B
      DTC P0136 is output (for models w/ CVT [w/o Euro-OBD]) C
      DTC P0136 is output (for other models) D
      DTC P0136, P0137 or P0138 and other DTCs are output E

      Tech Tips

      If any DTCs other than P0136, P0137 or P0138 are output, troubleshoot those DTCs first.


    B

    INSPECT FOR EXHAUST GAS LEAK Click here

    C

    CHECK TERMINAL VOLTAGE (+B OF HEATED OXYGEN SENSOR) Click here

    D

    READ VALUE USING INTELLIGENT TESTER (CONTROL THE INJECTOR VOLUME) Click here

    E

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / O2S B1S2.

    5. Start the engine and allow the engine to idle.

    6. Read the heated oxygen sensor output voltage with the engine idling.

      Result
      Tester Display Result Proceed to
      O2S B1S2 1.0 V or more A
      Less than 1.0 V B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME) Click here

    A

  3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)


    1. A01CEV8E09
      Text in Illustration
      *1

      Component without harness connected

      (Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (+B) - 4 (E2) Always 10 kΩ or higher
      2 (+B) - 3 (OX1B) Always 10 kΩ or higher

    3. Reconnect the heated oxygen sensor connector.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR


    1. Turn the engine switch off and wait for 5 minutes.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D41-47 (HT1B) - D41-64 (OX1B) Always 10 kΩ or higher

    4. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

    OK

    REPLACE ECM Click here

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Warm up the engine.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and O2S B1S2.

    6. Change the fuel injection volume using the tester, and monitor the voltage output of the air fuel ratio sensor and heated oxygen sensor displayed on the tester.

      Tech Tips


      • Change the fuel injection volume within the range of -12% and +12%.

      • The air fuel ratio sensor is displayed as AFS Voltage B1S1, and the heated oxygen sensor is displayed as O2S B1S2 on the intelligent tester.

      Result
      Tester Display (Sensor) Voltage Variation Proceed to
      AFS Voltage B1S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK
      AFS Voltage B1S1 (Air fuel ratio) Remains at more than 3.3 V NG
      AFS Voltage B1S1 (Air fuel ratio) Remains at less than 3.3 V NG

      Tech Tips

      A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.

      A01CD5RE29

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

  6. INSPECT AIR FUEL RATIO SENSOR

    Tech Tips

    This air fuel ratio sensor test is to check the air fuel ratio sensor current during the fuel cut operation. When the sensor is normal, the sensor current will indicate less than 3.6 mA in this test.


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs.

    5. Start the engine and warm up the engine.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Current B1S1.

    7. Drive the vehicle by the drive pattern as listed below:


      1. Accelerate the vehicle up to 60 km/h (38 mph) or more and release the accelerator pedal for 5 seconds or more without depressing the brake pedal, in order to execute fuel cut control. Repeat this process at least 3 times.

        A01CEAOE64

    8. Read the value of the air fuel ratio sensor current while fuel cut operation is being performed.

      Standard current
      Less than 3.6 mA

      Tech Tips


      • To measure the air fuel ratio sensor current precisely, perform the fuel cut operation as long as possible.

      • If it is difficult to measure the air fuel ratio sensor current, use the snapshot function of the intelligent tester.

      Result
      Result Proceed to
      Within standard range A
      Outside standard range B

    A

    REPLACE HEATED OXYGEN SENSOR Click here

    B

    REPLACE AIR FUEL RATIO SENSOR Click here

  7. READ VALUE USING INTELLIGENT TESTER (CONTROL THE INJECTOR VOLUME)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Warm up the engine.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / O2S B1S2.

    6. Change the fuel injection volume using the tester, monitoring the voltage output of the heated oxygen sensor displayed on the tester.

      Tech Tips


      • Change the fuel injection volume within the range of -12% to +12%.

      • The heated oxygen sensor has a maximum output delay of approximately 20 seconds.

      Standard voltage
      Fluctuates between 0.4 V or less and 0.55 V or higher.

    NG

    INSPECT FOR EXHAUST GAS LEAK Click here

    OK

  8. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE INJECTION VOLUME)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Warm up the engine.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and O2S B1S2.

    6. Change the fuel injection volume using the tester, and monitor the voltage output of the air fuel ratio sensor and heated oxygen sensor displayed on the tester.

      Tech Tips


      • Change the fuel injection volume within the range of -12% and +12%.

      • The air fuel ratio sensor is displayed as AFS Voltage B1S1, and the heated oxygen sensor is displayed as O2S B1S2 on the intelligent tester.

      Result
      Tester Display (Sensor) Voltage Variation Proceed to
      AFS Voltage B1S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK
      AFS Voltage B1S1 (Air fuel ratio) Remains at more than 3.3 V NG
      AFS Voltage B1S1 (Air fuel ratio) Remains at less than 3.3 V NG

      Tech Tips

      A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volumes. When the air fuel ratio sensor voltage remains at either less or more than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.

      A01CD5RE31

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

    CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO Click here

  9. INSPECT FOR EXHAUST GAS LEAK


    1. Inspect for exhaust gas leaks.

      OK
      No gas leaks.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

  10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)


    1. A01CEV8E06
      Text in Illustration
      *1

      Component without harness connected

      (Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      1 (HT1B) - 4 (E2) Always 10 kΩ or higher

    3. Reconnect the heated oxygen sensor connector.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

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


    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D52-1 (HT1B) - D41-47 (HT1B) Always Below 1 Ω
      D52-3 (OX1B) - D41-64 (OX1B) Always Below 1 Ω
      D52-4 (E2) - D41-87 (EX1B) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D52-1 (HT1B) or D41-47 (HT1B) - Body ground Always 10 kΩ or higher
      D52-3 (OX1B) or D41-64 (OX1B) - Body ground Always 10 kΩ or higher
      D52-4 (E2) or D41-87 (EX1B) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the heated oxygen sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

    OK

  12. REPLACE HEATED OXYGEN SENSOR


    1. Replace the heated oxygen sensor Click here.


    NEXT

  13. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off.

    5. Turn the engine switch on (IG) and turn the tester on.

    6. Perform confirmation driving pattern.


    NEXT

  14. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137 OR P0138)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    5. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0136, P0137 or P0138 is output A
      DTC is not output B

    B

    END

    A

    REPLACE AIR FUEL RATIO SENSOR Click here

  15. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor Click here.


    NEXT

  16. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off.

    5. Turn the engine switch on (IG) and turn the tester on.

    6. Perform confirmation driving pattern.


    NEXT

  17. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0138)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    5. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0136 or P0138 is output A
      DTC is not output B

    B

    END

    A

    REPLACE HEATED OXYGEN SENSOR Click here

  18. CHECK TERMINAL VOLTAGE (+B OF HEATED OXYGEN SENSOR)


    1. A01CFXWE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D52-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Reconnect the heated oxygen sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - EFI MAIN RELAY)

    OK

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


    1. Disconnect the heated oxygen sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      D52-1 (HT1B) - D41-47 (HT1B) Always Below 1 Ω
      D52-3 (OX1B) - D41-64 (OX1B) Always Below 1 Ω
      D52-4 (E2) - D41-87 (EX1B) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D52-1 (HT1B) or D41-47 (HT1B) - Body ground Always 10 kΩ or higher
      D52-3 (OX1B) or D41-64 (OX1B) - Body ground Always 10 kΩ or higher
      D52-4 (E2) or D41-87 (EX1B) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the heated oxygen sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)

    OK

  20. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)


    1. A01CEV8E06
      Text in Illustration
      *1

      Component without harness connected

      (Heated Oxygen Sensor)

      Disconnect the heated oxygen sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      1 (HT1B) - 4 (E2) Always 10 kΩ or higher

    3. Reconnect the heated oxygen sensor connector.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  21. INSPECT FOR EXHAUST GAS LEAK


    1. Inspect for exhaust gas leaks.

      OK
      No gas leaks.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

  22. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    INSPECT FUEL PUMP Click here

    OK

  23. INSPECT FUEL INJECTOR ASSEMBLY


    1. Inspect the fuel injector assembly Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  24. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


    1. Inspect the mass air flow meter sub-assembly Click here.


    NG

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

    OK

  25. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. Inspect the engine coolant temperature sensor Click here.


    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  26. INSPECT EMISSION CONTROL SYSTEM


    1. Inspect the emission control system Click here.


    NG

    REPAIR OR REPLACE EMISSION CONTROL SYSTEM

    OK

  27. INSPECT INTAKE SYSTEM


    1. Check the intake system for vacuum leaks Click here.

      OK
      No leaks in intake system.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  28. INSPECT IGNITION SYSTEM


    1. Check the ignition system Click here.


    NG

    REPAIR OR REPLACE IGNITION SYSTEM

    OK

  29. READ VALUE USING INTELLIGENT TESTER (AIR FUEL RATIO SENSOR OUTPUT)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Voltage B1S1 and Engine Speed.

    6. Check the air fuel ratio sensor voltage 3 times, when the engine is in each of the following conditions:


      1. While idling (check for at least 30 seconds) (Step "A")

      2. At an engine speed of approximately 2500 rpm (without any sudden changes in engine speed) (Step "B")

      3. The engine speed is raised to 4000 rpm and then the accelerator pedal is quickly released so that the throttle valve is fully closed (Step "C").

        Standard
        Condition Air Fuel Ratio Sensor Voltage Variation Reference
        Step "A" and "B" Changes at approximately 3.3 V Between 3.1 V and 3.4 V
        Step "C" Increases to 3.8 V or more

        This occurs during engine deceleration

        (when fuel cut performed)

      Tech Tips


      • For more information, see the diagrams below.

        A01CCT3E80

      • If the output voltage of the air fuel ratio sensor remains at approximately 3.3 V (see Malfunction Condition diagram) under any conditions, including those above, the air fuel ratio sensor may have an open circuit. (This will also happen if the air fuel ratio sensor heater has an open circuit.)

      • If the output voltage of the air fuel ratio sensor remains at either approximately 3.8 V or more, or 2.8 V or less (see Malfunction Condition diagram) under any conditions, including those above, the air fuel ratio sensor may have a short circuit.

      • The ECM stops fuel injection (fuel cut) during engine deceleration. This causes a lean condition and results in a momentary increase in the air fuel ratio sensor output voltage.

      • When the vehicle is driven:

        The output voltage of the air fuel ratio sensor may be below 2.8 V during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The air fuel ratio sensor is functioning normally.

      • The air fuel ratio sensor is a current output element; therefore, the current is converted into a voltage inside the ECM. Measuring the voltage at the connectors of the air fuel ratio sensor or ECM will show a constant voltage result.

      Result
      Result Proceed to
      Malfunction Condition A
      Normal Condition B

    B

    REPLACE HEATED OXYGEN SENSOR Click here

    A

  30. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor (sensor 1) Click here.


    NEXT

  31. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off.

    5. Turn the engine switch on (IG) and turn the tester on.

    6. Perform confirmation driving pattern.


    NEXT

  32. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    5. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0136 is output A
      DTC is not output B

    B

    END

    A

    REPLACE ECM Click here

  33. REPLACE HEATED OXYGEN SENSOR


    1. Replace the heated oxygen sensor (sensor 2) Click here.


    NEXT

  34. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

    3. Clear the DTCs Click here.

    4. Turn the engine switch off.

    5. Turn the engine switch on (IG) and turn the tester on.

    6. Perform confirmation driving pattern.


    NEXT

  35. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.

    5. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0136 is output A
      DTC is not output B

    B

    END

    A

    REPLACE ECM Click here

  36. INSPECT FUEL PUMP


    1. Inspect the fuel pump Click here.


    NG

    REPLACE FUEL PUMP Click here

    OK

    REPAIR OR REPLACE FUEL LINE