SFI SYSTEM, Diagnostic DTC:P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158, P0159

CAUTION / NOTICE / HINT

DESCRIPTION

A three-way catalytic converter is used in order to convert the carbon monoxide (CO), hydrocarbon (HC), and oxides of nitrogen (NOx) into less harmful substances. To allow the three-way catalytic converter to function effectively, it is necessary to keep the air fuel ratio of the engine near the stoichiometric air fuel ratio. For 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 becomes 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.

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 and heated oxygen sensor malfunctions (refer to the diagram below).

   Active air fuel ratio control is performed for approximately 15 to 20 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 set.

2. Abnormal Voltage Output of Heated Oxygen Sensor (DTC P0136 and P0156)

   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 decrease to less than 0.21 V or does not increase to 0.66 V or more during active air fuel ratio control, the ECM determines that the sensor voltage output is abnormal and sets DTC P0136 or P0156.

   

3. Open or Short in Heated Oxygen Sensor Circuit (DTC P0137 and P0157 or P0138 and P0158) (w/o Canister Pump Module)

   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 or short, or the voltage output of the sensor decreases significantly, the Oxygen Storage Capacity (OSC) is indicated as having 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 HO2 sensor voltage output is 0.21 V or less (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137 or P0157. When the target air-fuel ratio is lean and the voltage output is 0.66 V or more (rich) during active air-fuel ratio control, the ECM determines that the sensor voltage output is abnormally high and stores DTC P0138 or P0158.

   *: The Three-way Catalytic Converter (TWC) has the capability to store oxygen. The Oxygen Storage Capacity (OSC) and the emissions purification capacity of the Three-way Catalytic Converter (TWC) are mutually related. The ECM determines whether the catalyst has deteriorated based on the calculated Oxygen Storage Capacity (OSC) value Click here.

   

4. Open in Heated Oxygen Sensor Circuit (DTCs P0137 and P0157) (w/ Canister Pump Module)

   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 Oxygen Storage Capacity (OCS) is 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 0.21 V or less (lean), the ECM interprets this as an abnormally low sensor output voltage and stores DTC P0137 or P0157.

   Tech Tips

   *: The Three-way Catalytic Converter (TWC) has the capability to store oxygen. The Oxygen Storage Capacity (OSC) and the emissions purification capacity of the Three-way Catalytic Converter (TWC) are mutually related. The ECM determines whether the catalyst has deteriorated based on the calculated Oxygen Storage Capacity (OSC) value Click here.

   

5. High or Low Impedance of Heated Oxygen Sensor (DTCs P0136 and P0156 or P0137 and P0157) (w/ Canister Pump Module)

   

   Relationship between element temperature and impedance

   *a	DTC Detection Area

   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.

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

   Tech Tips

   
   

   • The impedance cannot be measured using an ohmmeter.

   • DTC P0136 or P0156 indicates the deterioration of the heated oxygen sensor. The ECM sets the DTCs by calculating the impedance of the sensor when the typical enabling conditions are satisfied (2 driving cycles).

   • DTC P0137 or P0157 indicates an open or short circuit in the heated oxygen sensor (2 driving cycles). The ECM sets the DTCs when the impedance of the sensor exceeds the threshold 15 kΩ.

6. Extremely High Output Voltage of Heated Oxygen Sensor (DTCs P0138 and P0158) (w/ Canister Pump Module)

   The ECM continuously monitors the heated oxygen sensor output voltage while the engine is running. DTC P0138 or P0158 is stored if the heated oxygen sensor voltage output is higher than 1.2 V for 10 seconds or more.

7. Abnormal Voltage Output of Heated Oxygen Sensor During Fuel Cut (DTCs P0139 and P0159) (w/ Canister Pump Module)

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

8. Abnormal Voltage Output of Heated Oxygen Sensor During Fuel Cut from Rich Condition (DTCs P013A and P013C) (w/ Canister Pump Module)

   If the sensor output voltage does not drop from 0.35 to 0.2 V immediately when the vehicle decelerates and fuel cut is operating, the system illuminates the MIL and stores a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

*: w/ Canister Pump Module

CONFIRMATION DRIVING PATTERN

• P0136, P0137, P0138, P0156, P0157 and P0158

1. Connect the GTS to the DLC3.

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

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

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

5. Turn the power switch on (IG) and turn the GTS 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 with the shift lever in P [B].

   Tech Tips

   In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

8. With the shift lever in D, drive the vehicle at 75 to 100 km/h (47 to 62 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 / Pending.

10. Read the pending DTC [D].

    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, P0138, P0156, P0157 or P0158.

13. Check the DTC judgment result.

    GTS 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 NORMAL, the system is normal.

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

• P0139, P013A, P013C and P0159 (w/ Canister Pump Module)

1. Connect the GTS to the DLC3.

2. Turn the power switch on (IG).

3. Turn the GTS on.

4. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

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

6. Turn the power switch on (IG) and turn the GTS on.

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

8. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the shift lever in P [A].

   Tech Tips

   In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

9. Drive the vehicle at approximately 75 km/h (47 mph) for 10 minutes or more [B].

   CAUTION:

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

   Tech Tips

   Drive the vehicle while keeping the engine load as constant as possible.

10. With the shift lever in S, 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.

11. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / O2 Sensor / RL F/C B1S2, RL F/C B2S2 [D].

12. Check the Test Value for RL F/C B1S2, RL F/C B2S2.




1. If Test Value displays 0, perform step [C] until it displays a value larger than 0, as the O2 sensor monitor is not finished.

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

14. Input the DTC: P0136, P0137, P0138, P0156, P0157 or P0158.

15. Check the DTC judgment result.

    GTS 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 NORMAL, the system is normal.

    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

16. Read the pending DTC [D].

    Tech Tips

    
    

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

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

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

18. Input the DTC: P0139, P013A, P013C or P0159.

19. Check the DTC judgment result.

    GTS 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 NORMAL, the system is normal.

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

• Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.

• To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Gas AF Control / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2; and then press the graph button on the Data List view.

PROCEDURE

1. READ DTC OUTPUT (DTC P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158 OR P0159)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

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

   5. Read the DTCs.

      Result
      Result Proceed to DTC P0138 or P0158 is output A DTC P0137 or P0157 is output B DTC P0136 or P0156 is output C DTC P0139, P013A, P013C or P0159 is output D P0136, P0137, P0138, P0156, P0157 or P0158 and other DTCs are output E

      Tech Tips

      If any DTCs other than P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158 and P0159 are output, troubleshoot those DTCs first.

   
   

   B

   CHECK FOR EXHAUST GAS LEAK Click here

   C

   PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) Click here

   D

   CHECK FOR EXHAUST GAS LEAK Click here

   E

   GO TO DTC CHART Click here

   A

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

   Tech Tips

   For vehicles with canister pump modules, do not perform this procedure and proceed to the next step.

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

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

   5. Start the engine.

   6. Enter the following menus: Powertrain / Engine and ECT / Data List / A/F Control System / O2S B1S2 or O2S B2S2.

   7. Allow the engine to idle.

   8. Read the heated oxygen sensor output voltage while idling.

      Result
      Result Proceed to 1.0 V or more A Less than 1.0 V B

   
   

   B

   PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) Click here

   A

3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Heated Oxygen Sensor for Bank 1)
      *b	Component without harness connected (Heated Oxygen Sensor for Bank 2)

      Turn the power switch off and wait for 5 minutes.

   2. Disconnect the heated oxygen sensor connector.

   3. 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 2 (+B) - 4 (E2) Always 10 kΩ or higher 2 (+B) - 3 (OX2B) Always 10 kΩ or higher

   4. Reconnect the heated oxygen sensor connector.

   
   

   NG

   REPLACE HEATED OXYGEN SENSOR Click here

   OK

4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

   
   

   1. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition F5-28 (HT1B) - F5-101 (OX1B) Always 10 kΩ or higher F5-22 (HT2B) - F5-133 (OX2B) Always 10 kΩ or higher

   3. Reconnect the ECM connector.

   
   

   OK

   REPLACE ECM Click here

   NG

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

5. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Start the engine.

   3. Turn the GTS 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 is 75°C (167°F) or higher with the shift lever in P.

      Tech Tips

      In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

   6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 or AFS Voltage B2S1.

   7. Change the fuel injection volume using the GTS, and monitoring the voltage output of air fuel ratio and heated oxygen sensors displayed on the GTS.

      Tech Tips

      
      

      • Change the fuel injection volume within the range of -12.5% and +12.5%. The injection volume can be changed in fine graduations within the range.

      • The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2, on the GTS.

      • 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
      GTS Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG

      Tech Tips

      A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) 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.

      

   
   

   NG

   REPLACE AIR FUEL RATIO SENSOR Click here

   OK

6. CHECK 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. When the sensor is normal, the sensor current will indicate below 2.2 mA in this test.

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS on.

   4. Clear the DTC Click here.

   5. Drive the vehicle using the drive pattern as listed below:

      
      

      1. Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more with the shift lever in P.

         Tech Tips

         In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

      2. Drive the vehicle at 60 km/h (37 mph) or more for 10 minutes or more.

         CAUTION:

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

      3. Stop the vehicle.

      4. Accelerate the vehicle to 60 km/h (37 mph) or more and decelerate for 5 seconds or more. Perform this 3 times.

         CAUTION:

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

         

         Driving Pattern

         *a	60 km/h
         *b	0 km/h
         *c	10 minutes or more
         *d	8 seconds or more

   6. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / AFS Current B1S1 and AFS Current B2S1.

   7. Read the value of the air fuel ratio sensor current while the fuel cut is occurring.

      Standard Current
      Less than 2.2 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 tester.

   
   

   OK

   REPLACE HEATED OXYGEN SENSOR Click here

   NG

   REPLACE AIR FUEL RATIO SENSOR Click here

7. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS 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 is 75°C (167°F) or higher with the shift lever in P.

      Tech Tips

      In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

   6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / All Data / O2S B1S2 or O2S B2S2.

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

      Tech Tips

      
      

      • Change the fuel injection volume within the range of -12.5% and +12.5%. The injection volume can be changed in fine graduations within the range.

      • 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.

      Standard
      Fluctuates between 0.4 V or less and 0.55 V or more.

   
   

   NG

   CHECK FOR EXHAUST GAS LEAK Click here

   OK

8. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the GTS 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 is 75°C (167°F) or higher with the shift lever in P.

      Tech Tips

      In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.

   6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 or AFS Voltage B2S1.

   7. Change the fuel injection volume using the GTS, and monitoring the voltage output of air fuel ratio and heated oxygen sensors displayed on the GTS.

      Tech Tips

      
      

      • Change the fuel injection volume within the range of -12.5% and +12.5%. The injection volume can be changed in fine graduations within the range.

      • The air fuel ratio sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the heated oxygen sensor is displayed as O2S B1S2 or O2S B2S2, on the GTS.

      • 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
      GTS Display (Sensor) Voltage Variation Proceed to AFS Voltage B1S1 AFS Voltage B2S1 (Air fuel ratio) Alternates between more and less than 3.3 V OK Remains at more than 3.3 V NG Remains at less than 3.3 V NG

      Tech Tips

      A normal heated oxygen sensor voltage (O2S B1S2 or O2S B2S2) 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.

      

   
   

   OK

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

   NG

   REPLACE AIR FUEL RATIO SENSOR Click here

9. 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

10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

    
    
    1. 

       Text in Illustration

       *a	Component without harness connected (Heated Oxygen Sensor for Bank 1)
       *b	Component without harness connected (Heated Oxygen Sensor for Bank 2)

       Turn the power switch off and wait for 5 minutes.

    2. Disconnect the heated oxygen sensor connector.

    3. 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 2 (+B) - 4 (E2) Always 10 kΩ or higher 2 (+B) - 3 (OX2B) Always 10 kΩ or higher

    4. 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

       Tester Connection Condition Specified Condition N71-1 (HT1B) - F5-28 (HT1B) Always Below 1 Ω N71-3 (OX1B) - F5-101 (OX1B) Always Below 1 Ω N71-4 (E2) - F5-102 (EX1B) Always Below 1 Ω F53-1 (HT2B) - F5-22 (HT2B) Always Below 1 Ω F53-3 (OX2B) - F5-133 (OX2B) Always Below 1 Ω F53-4 (E2) - F5-134 (EX2B) Always Below 1 Ω N71-1 (HT1B) or F5-28 (HT1B) - Body ground Always 10 kΩ or higher N71-3 (OX1B) or F5-101 (OX1B) - Body ground Always 10 kΩ or higher F53-1 (HT2B) or F5-22 (HT2B) - Body ground Always 10 kΩ or higher F53-3 (OX2B) or F5-133 (OX2B) - Body ground Always 10 kΩ or higher

    4. Reconnect the heated oxygen sensor connector.

    5. Reconnect the ECM 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.

       Tech Tips

       Perform "Inspection After Repair" after replacing the heated oxygen sensor Click here.

    
    

    NEXT

13. PERFORM CONFIRMATION DRIVING PATTERN

    
    

    1. Refer to the Confirmation Driving Pattern (P0136, P0137, P0138, P0156, P0157 and P0158).

    
    

    NEXT

14. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Input DTC: P0136, P0137, P0138, P0156, P0157 or P0158.

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

       Result
       Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0136, P0137, P0138, P0156, P0157 or P0158 is output) B

    
    

    A

    END

    B

    REPLACE AIR FUEL RATIO SENSOR Click here

15. 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

16. PERFORM CONFIRMATION DRIVING PATTERN

    
    

    1. Refer to the Confirmation Driving Pattern (P0136, P0137, P0138, P0156, P0157 and P0158).

    
    

    NEXT

17. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0138, P0156 OR P0158)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Input DTC: P0136, P0138, P0156 or P0158.

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

       Result
       Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0136, P0138, P0156 or P0158 is output) B

    
    

    A

    END

    B

    REPLACE HEATED OXYGEN SENSOR Click here

18. CHECK FOR EXHAUST GAS LEAK

    
    

    1. Check for exhaust gas leak.

       OK
       No gas leakage.

       Tech Tips

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

    
    

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAK POINT

    OK

19. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

    
    

    1. Turn the power 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 F5-28 (HT1B) - F5-101 (OX1B) Always 10 kΩ or higher F5-22 (HT2B) - F5-133 (OX2B) Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

20. PERFORM CONFIRMATION DRIVING PATTERN

    
    

    1. Perform Confirmation Driving Pattern (P0139 and P0159).

    
    

    NEXT

21. READ DTC OUTPUT (DTC P0139, P013A, P013C OR P0159 IS OUTPUT AGAIN)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Input DTCs: P0139, P013A, P013C and P0159.

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

       Result
       Result Proceed to NORMAL (DTC is not output) A ABNORMAL (DTC P0139, P013A, P013C or P0159 is output) B

    
    

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE HEATED OXYGEN SENSOR Click here