SFI SYSTEM, Diagnostic DTC:P0136, P0137, P0138, P0139

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)
P0139 Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)

DESCRIPTION

In order to obtain a high purification rate of the carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) components in the exhaust gas, a TWC (Three-Way Catalytic Converter) is used. For the most efficient use of the TWC, 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 TWC, 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 high. The heated oxygen sensor informs the ECM that the post-TWC 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 is low. The heated oxygen sensor informs the ECM that the post-TWC 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 TWC is rich or lean, and adjusts the fuel injection duration 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.

A011YTWE01
DTC No. DTC Detection Condition Trouble Area
P0136

Either of the following conditions is met:

  • Abnormal voltage output:

    • During active air fuel ratio control, heated oxygen sensor voltage does not increase to 0.69 V or higher for certain period of time (2 trip detection logic)

  • Low impedance:

    • Sensor impedance less than 5 Ω for 30 seconds or more when ECM presumes sensor is warmed up and operating normally (2 trip detection logic)

  • Heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Air fuel ratio sensor (sensor 1)

  • Gas leak from exhaust system

  • Fuel pressure

  • Fuel injector assembly

  • PCV valve and hose

  • Intake system

  • EGR valve assembly
P0137

Either of the following conditions is met:

  • Low voltage (open):

    • During active air fuel ratio control, following conditions (a) and (b) 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

  • High impedance:

    • Sensor impedance 15 kΩ or higher for 90 seconds or more when ECM presumes sensor to be warmed up and operating normally (2 trip detection logic)

  • Heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Air fuel ratio sensor (sensor 1)

  • Gas leak from exhaust system

  • EGR valve assembly
P0138

  • Extremely high voltage (short):

    • Heated oxygen sensor voltage output exceeds 1.2 V for 10 seconds or more (2 trip detection logic)

  • Heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • ECM
P0139

Either of the following conditions is met:

  • Heated oxygen sensor (sensor 2) voltage does not drop to less than 0.2 V immediately after fuel cut starts (2 trip detection logic)

  • Heated oxygen sensor (sensor 2) voltage does not drop from 0.35 V to 0.2 V immediately after fuel cut status (2 trip detection logic)

  • Heated oxygen sensor (sensor 2) circuit

  • Heated oxygen sensor (sensor 2)

  • Gas leak from exhaust system

  • EGR valve assembly

MONITOR DESCRIPTION

  1. Active Air fuel Ratio Control

    The ECM usually performs air fuel ratio feedback control so that the air fuel ratio sensor output indicates a near stoichiometric air fuel level. This vehicle includes active air fuel ratio control in addition to regular air fuel ratio control. The ECM performs active air fuel ratio control to detect any deterioration in the Three-Way Catalytic Converter (TWC) and heated oxygen sensor malfunctions (refer to the diagram below).

    Active air fuel ratio control is performed for approximately 30 seconds while driving with a warm engine. During active air fuel ratio control, the air fuel ratio is forcibly regulated to become lean or rich by the ECM. If the ECM detects a malfunction, a DTC is stored.

  2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136)

    While the ECM is performing active air fuel ratio control, the air fuel ratio is forcibly regulated to become rich or lean. If the sensor is not functioning properly, the voltage output variation is small. For example, when the heated oxygen sensor voltage does not increase to 0.69 V or higher during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormal and stores DTCs P0136.

    A011WWSE38

  3. Open in Heated Oxygen Sensor Circuit (DTC P0137)

    During active air fuel ratio control, the ECM calculates the Oxygen Storage Capacity (OSC)* of the Three-Way Catalytic Converter (TWC) by forcibly regulating the air fuel ratio to become rich or lean.

    If the heated oxygen sensor has an open circuit, or the voltage output of the sensor noticeably decreases, the OSC indicates an extraordinarily high value. Even if the ECM attempts to continue regulating the air fuel ratio to become rich or lean, the heated oxygen sensor output does not change.

    While performing active air fuel ratio control, when the target air fuel ratio is rich and the heated oxygen sensor voltage output is less than 0.21 V (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137.

    Tech Tips

    *: The TWC has the capability to store oxygen. The OSC and the emission purification capacity of the TWC are mutually related. The ECM determines whether the catalyst has deteriorated, based on the calculated OSC value Click here.

    A011VHDE23

  4. High or Low Impedance of Heated Oxygen Sensor (DTCs P0136 or P0137)

    During normal air fuel ratio feedback control, there are small variations in the exhaust gas oxygen concentration. In order to continuously monitor the slight variation of the heated oxygen sensor signal while the engine is running, the impedance* of the sensor is measured by the ECM. The ECM determines that there is a malfunction in the sensor when the measured impedance deviates from the standard range.

    A011X7RE32

    *: The effective resistance in an alternating current electrical circuit.

    Tech Tips

    • The impedance cannot be measured using an ohmmeter.

    • DTC P0136 indicates the deterioration of the heated oxygen sensor. The ECM stores the DTC by calculating the impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles).

    • DTC P0137 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM stores the DTC when the impedance of the sensor exceeds the threshold 15 kΩ.

  5. Extremely High Output Voltage of Heated Oxygen Sensor (DTC P0138)

    The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running.

    DTC P0138 is stored if the heated oxygen sensor voltage output is 1.2 V or higher for 10 seconds or more.

  6. Abnormal Voltage Output of Heated Oxygen Sensor During Fuel-cut (DTC P0139)

    The sensor output voltage drops to less than 0.2 V (extremely lean status) immediately when the vehicle decelerates and fuel cut is operating. If the voltage does not drop to less than 0.2 V for 6 seconds or more, or voltage does not drop from 0.35 to 0.2 V for 1 second or more, the ECM determines that the sensor response has deteriorated, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P0136: Heated oxygen sensor voltage check (voltage malfunction)

P0136: Heated oxygen sensor circuit continuity check (circuit short)

P0137: Heated oxygen sensor voltage check (low voltage)

P0137: Heated oxygen sensor circuit continuity check (circuit open)

P0138: Heated oxygen sensor circuit continuity check (out of range)

P0139: Heated oxygen sensor response rate during fuel cut
Required Sensors/Components (Main) Heated oxygen sensor (sensor 2)
Required Sensors/Components (Related)

Crankshaft position sensor

Engine coolant temperature sensor

Mass air flow meter sub-assembly

Throttle position sensor

Air fuel ratio sensor
Frequency of Operation

Once per driving cycle: Active air fuel ratio control detection, heated oxygen sensor abnormal voltage during fuel cut.

Continuous: Other
Duration

20 seconds: Heated oxygen sensor voltage check (voltage malfunction, low voltage)

30 seconds: Heated oxygen sensor circuit continuity check (circuit short)

90 seconds: Heated oxygen sensor circuit continuity check (circuit open)

10 seconds: Heated oxygen sensor circuit continuity check (out of range)

6 seconds: Heated oxygen sensor response rate during fuel cut
MIL Operation 2 driving cycles
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

All
Monitor runs whenever the following DTCs are not stored

P0016 (VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor heater)

P0037, P0038, P102D (Heated oxygen sensor heater)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0112, P0113 (Intake air temperature sensor)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P01235 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0128 (Thermostat)

P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)

P0171, P0172 (Fuel system)

P0301, P0302, P0303, P0304 (Misfire)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0401 (EGR system (closed))

P0451, P0452, P0453 (EVAP system)

P219A (Air fuel ratio imbalance)
P0136 and P0137: Heated Oxygen Sensor Voltage Check (Voltage Malfunction and Low Voltage)
Auxiliary battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs) [570 mmHg(abs)] or higher
Idling Off
Engine speed Less than 4000 rpm
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 70%
P0136: Heated Oxygen Sensor Circuit Continuity Check (Circuit Short)
Auxiliary battery voltage 11 V or higher
Estimated heated oxygen sensor temperature Less than 700°C (1292°F)
ECM monitor Completed
DTC P0607 Not set
P0137: Heated Oxygen Sensor Circuit Continuity Check (Circuit Open)
Auxiliary battery voltage 11 V or higher
Estimated heated oxygen sensor temperature 450°C (842°F) or higher, and less than 750°C (1382°F)
DTC P0607 Not set
P0138: Heated Oxygen Sensor Circuit Continuity Check (Out of Range)
Auxiliary battery voltage 11 V or higher
Time after engine start 2 seconds or more
P0139: Heated Oxygen Sensor Response Rate During Fuel Cut
Engine coolant temperature 75°C (167°F) or higher
Catalyst temperature 400°C (752°F) or higher
Fuel cut On

TYPICAL MALFUNCTION THRESHOLDS

P0136: Heated Oxygen Sensor Voltage Check (Voltage Malfunction)
All of the following conditions (a), (b) and (c) met -
(a) OSC (Oxygen Storage Capacity) of Catalyst 2.23 g or more
(b) Commanded air fuel ratio 14.4 or less
(c) Heated oxygen sensor voltage 0.21 V or higher, and less than 0.69 V
P0137: Heated Oxygen Sensor Voltage Check (Low Voltage)
All of the following conditions (a), (b) and (c) met -
(a) OSC (Oxygen Storage Capacity) of Catalyst 2.23 g or more
(b) Commanded air fuel ratio 14.4 or less
(c) Heated oxygen sensor voltage Less than 0.21 V
P0136: Heated Oxygen Sensor Circuit Continuity Check (Circuit Short)
Duration of following condition 30 seconds or more
Heated oxygen sensor impedance Less than 5 Ω
P0137: Heated Oxygen Sensor Circuit Continuity Check (Circuit Open)
Duration of following condition 90 seconds or more
Heated oxygen sensor impedance 15 kΩ or higher
P0138: Heated Oxygen Sensor Circuit Continuity Check (Out of Range)
Duration of following condition 10 seconds or more
Heated oxygen sensor voltage 1.2 V or higher
P0139: Heated Oxygen Sensor Response Rate During Fuel Cut
Either of the following conditions is met -
Duration until heated oxygen sensor voltage drops to 0.2 V after fuel cut 6 seconds or more
Duration until heated oxygen sensor voltage drops from 0.35 to 0.2 V during fuel cut 1 second or more

MONITOR RESULT

Refer to detailed information in Checking Monitor Status Click here.

P0137: O2 Sensor / MAX VOL B1S2
Monitor ID Test ID Scaling Unit Description
$02 $08 Multiply by 0.001 V Maximum sensor voltage
P0139: O2 Sensor / RL F/C B1S2
Monitor ID Test ID Scaling Unit Description
$02 $8B Multiply by 0.001 Seconds 0.35 - 0.2 V sensor switch time
P0139: O2 Sensor / F/C TIME B1S2
Monitor ID Test ID Scaling Unit Description
$02 $8D Multiply by 0.001 Seconds Duration that sensor voltage drops to 0.2 V during fuel-cut
P0136: O2 Sensor / MAX OSC B1S2
Monitor ID Test ID Scaling Unit Description
$02 $8F Multiply by 0.0003 g Maximum oxygen storage capacity

CONFIRMATION DRIVING PATTERN

Tech Tips

  • This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.

  • Performing this confirmation driving pattern will activate the heated oxygen sensor monitor (The catalyst monitor is performed simultaneously). This is very useful for verifying the completion of a repair.

P0136, P0137 and P0138
A011XTYE98

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the Techstream on [A].

  6. Put the engine in inspection mode (maintenance mode) Click here.

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

  8. With the shift lever in D, drive the vehicle at 75 to 120 km/h (47 to 75 mph) for 10 minutes or more [C].

    CAUTION:

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

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].

  10. Read the pending DTCs.

    Tech Tips

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

    • If a pending DTC is not output, perform the following procedure.

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

  12. Input the DTC: P0136, P0137 or P0138.

  13. Check the DTC judgment result.

    Techstream 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 NORMAL, the system is normal.

    • 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] again.

  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips

    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

P0139
A011YEBE82

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the Techstream on [A].

  6. Put the engine in inspection mode (maintenance mode) Click here.

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

  8. Drive the vehicle at 75 km/h (47 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].

    CAUTION:

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

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].

  10. Read the pending DTCs.

    Tech Tips

    • If a pending DTC or current DTC is output, the system is malfunctioning.

    • If a pending DTC or current DTC is not output, perform the following procedure.

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

  12. Input the DTC: P0139.

  13. Check the DTC judgment result.

    Techstream 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 NORMAL, the system is normal.

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

    • If the judgment result shows INCOMPLETE or N/A, drive the vehicle with the shift lever in B position, and then perform steps [C] and [D] again.

  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips

    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0037 Click here.

INSPECTION PROCEDURE

Tech Tips

Malfunctioning areas can be identified by performing the Control the Injection Volume function provided in the Active Test. The Control the Injection Volume 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 operation using the Techstream.

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the Techstream on.

  4. Put the engine in inspection mode (maintenance mode) Click here.

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

  6. Idle the engine for 5 minutes or more with the shift lever in P.

  7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Gas AF Control / AFS Voltage B1S1 and O2S B1S2.

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

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

    Tech Tips

    • Change the fuel injection volume within the range of -12% to 12%. The injection volume can be changed in fine gradations.

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

Techstream Display (Sensor) Injection Volume Status Voltage

AFS Voltage B1S1

(Air fuel ratio)

 12% Rich Below 3.1 V
-12% Lean Higher than 3.4 V

O2S B1S2

(Heated oxygen)

 12% Rich Higher than 0.55 V
-12% Lean Below 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 A011WMTE12 A011Y8ZE08 A011WMTE12 A011XWJE06 -
2 A011WMTE12 A011WROE01 A011WMTE12 A011XWJE06

  • Air fuel ratio sensor

  • Air fuel ratio sensor heater

  • Air fuel ratio sensor circuit
3 A011WMTE12 A011Y8ZE08 A011WMTE12 A011WROE01

  • Heated oxygen sensor

  • Heated oxygen sensor heater

  • Heated oxygen sensor circuit
4 A011WMTE12 A011WROE01 A011WMTE12 A011WROE01

  • Fuel injector assembly

  • Fuel pressure

  • Gas leak from exhaust system (Air fuel ratio extremely rich or lean)

Note

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

Tech Tips

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

  • Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. 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, P0138 OR P0139)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0138 is output A
      DTC P0137 is output B
      DTC P0136 is output C
      DTC P0139 is output D
      DTC P0136, P0137 or P0138 and other DTCs are output E

      Tech Tips

      If any DTCs other than P0136, P0137, P0138 or P0139 are output, troubleshoot those DTCs first.

    B

    CHECK FOR EXHAUST GAS LEAK Click here

    C

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

    D

    CHECK FOR EXHAUST GAS LEAK Click here

    E

    GO TO DTC CHART Click here

    A

  2. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

    A011XB8E99

    1. 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
      Text in Illustration
      *a

      Component without harness connected

      (Heated Oxygen Sensor)
    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

    1. Turn the power switch to off and wait for 5 minutes or more.

    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
      E28-24 (HT1B) - E28-100 (OX1B) Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine and warm it up.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Gas AF Control / O2S B1S2.

    7. Change the fuel injection volume using the Techstream, and monitor the voltage output of heated oxygen sensor displayed on the Techstream.

      Tech Tips

      • Change the fuel injection volume within the range of -12% to 12%. The injection volume can be changed in fine gradations within this range.

      • 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

    CHECK FOR EXHAUST GAS LEAK Click here

    OK

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

    1. Turn the power switch on (IG).

    2. Turn the Techstream on.

    3. Put the engine in inspection mode (maintenance mode) Click here.

    4. Start the engine and warm it up.

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

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

      Tech Tips

      • Change the fuel injection volume within the range of -12% to 12%. The injection volume can be changed in fine gradations within this range.

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

      • 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.

      • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

      Result
      Techstream Display (Sensor) Voltage Variation Proceed to
      AFS Voltage B1S1 (Air fuel ratio) Alternates between higher and less than 3.3 V OK
      Remains at higher than 3.3 V NG
      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 (AFS Voltage B1S1) remains at either less or higher than 3.3 V despite the heated oxygen sensor indicating a normal reaction, the air fuel ratio sensor is malfunctioning.

      A011XPUE35
    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

  6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      Tech Tips

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

      		 MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips

      During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

    NG

    INSPECT EGR VALVE ASSEMBLY Click here

    OK

    CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR ASSEMBLY, FUEL SYSTEM, INTAKE SYSTEM, ETC.) Click here

  7. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly Click here.

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR ASSEMBLY, FUEL SYSTEM, INTAKE SYSTEM, ETC.) Click here

  8. CHECK FOR EXHAUST GAS LEAK

    1. Check for exhaust gas leaks.

      OK
      No gas leaks.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system Click here.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

  9. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

    1. Inspect the heated oxygen sensor Click here.

    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  10. 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
      Tester Connection Condition Specified Condition
      E21-1 (HT1B) - E28-24 (HT1B) Always Below 1 Ω
      E21-3 (OX1B) - E28-100 (OX1B) Always Below 1 Ω
      E21-4 (E2) - E28-132 (EX1B) Always Below 1 Ω
      E21-1 (HT1B) or E28-24 (HT1B) - Body ground Always 10 kΩ or higher
      E21-3 (OX1B) or E28-100 (OX1B) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. REPLACE HEATED OXYGEN SENSOR

    1. Replace the heated oxygen sensor Click here.

    NEXT

  12. PERFORM CONFIRMATION DRIVING PATTERN

    1. Perform the Confirmation Driving Pattern (P0136, P0137 and P0138).

    NEXT

  13. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 OR P0137)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Input DTCs: P0136 or P0137.

    6. Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed.

      Result
      Result Proceed to

      ABNORMAL

      (DTC P0136 or P0137 is output)

      		 A

      NORMAL

      (DTC is not output)

      		 B
    B

    END

    A

  14. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      Tech Tips

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

      		 MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips

      • During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

      • Perform "Inspection After Repair" after replacing the air fuel ratio sensor Click here.

    NG

    INSPECT EGR VALVE ASSEMBLY Click here

    OK

    REPLACE AIR FUEL RATIO SENSOR Click here

  15. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly or air fuel ratio sensor Click here.

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    REPLACE AIR FUEL RATIO SENSOR Click here

  16. REPLACE AIR FUEL RATIO SENSOR

    1. Replace the air fuel ratio sensor Click here.

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor Click here.

    NEXT

  17. PERFORM CONFIRMATION DRIVING PATTERN

    1. Perform the Confirmation Driving Pattern (P0136, P0137 and P0138).

    NEXT

  18. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Input DTCs: P0136.

    6. Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed.

      Result
      Result Proceed to

      ABNORMAL

      (DTC P0136 is output)

      		 A

      NORMAL

      (DTC is not output)

      		 B
    B

    END

    A

  19. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      Tech Tips

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

      		 MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips

      During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

    NG

    INSPECT EGR VALVE ASSEMBLY Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here

  20. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly Click here.

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here

  21. CHECK FOR EXHAUST GAS LEAK

    1. Check for exhaust gas leaks.

      OK
      No gas leaks.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system Click here.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

  22. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

    1. Turn the power switch off and wait for 5 minutes or more.

    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
      E28-24 (HT1B) - E28-100 (OX1B) Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  23. PERFORM CONFIRMATION DRIVING PATTERN

    1. Perform the Confirmation Driving Pattern (P0139).

    NEXT

  24. READ OUTPUT DTC (DTC P0139 IS OUTPUT AGAIN)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

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

    5. Input DTCs: P0139.

    6. Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed.

      Result
      Result Proceed to

      ABNORMAL

      (DTC P0139 is output)

      		 A

      NORMAL

      (DTC is not output)

      		 B
    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  25. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

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

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Primary / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      Tech Tips

      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP and idling condition change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      Idling condition

      (Throttle Idle Position: ON)

      		 Steady idling Idling changes from steady to rough idling or engine stalls

      MAP

      (Data List)

      MAP value is 20 to 40 kPa(abs) [150 to 300 mmHg(abs)]

      (EGR valve is fully closed)

      		 MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips

      During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

    NG

    INSPECT EGR VALVE ASSEMBLY Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here

  26. INSPECT EGR VALVE ASSEMBLY

    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly Click here.

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here