SFI SYSTEM, 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 (TWC) and located far from the engine assembly.

A TWC is used in order to convert the carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) into less harmful substances. To allow the TWC to function effectively, it is necessary to keep the air fuel ratio of the engine near the stoichiometric air fuel ratio. 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 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 TWC 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.

A0117BVE01
DTC No. DTC Detection Condition Trouble Area
P0136

  • Abnormal voltage output:

    During active air fuel ratio control, the 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 0.70 V

  • Open or short in heated oxygen sensor (bank 1 sensor 2) circuit

  • Heated oxygen sensor (bank 1 sensor 2)

  • Air fuel ratio sensor (bank 1 sensor 1)

  • Gas leak from exhaust system

  • EGR valve assembly
P0137

  • Low voltage (open):

    During active air fuel ratio control, the 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 (bank 1 sensor 2) circuit

  • Heated oxygen sensor (bank 1 sensor 2)

  • Gas leak from exhaust system

  • Air fuel ratio sensor (bank 1 sensor 1)

  • EGR valve assembly
P0138

  • High voltage (short):

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


  • (a) Heated oxygen sensor voltage output 0.70 V or more

  • (b) Target air fuel ratio lean

  • Short in heated oxygen sensor (bank 1 sensor 2) circuit

  • Heated oxygen sensor (bank 1 sensor 2)

  • Air fuel ratio sensor (bank 1 sensor 1)

  • ECM

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

A011BHUE02

  1. Connect an intelligent tester to the DLC3.

  2. Turn the ignition switch to ON.

  3. Turn the tester on.

  4. Clear the DTCs Click here.

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

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

  7. Turn the tester on.

  8. Enter the following menus: Powertrain / Engine and ECT / Data List / O2S (A/FS) Monitor.

  9. Check that the item O2S (A/FS) Monitor displays Incmpl (Incomplete).

  10. Drive the vehicle at between 60 km/h and 120 km/h (37 mph and 75 mph) for 10 minutes. However, the vehicle should be driven at a constant speed. [B]

    CAUTION:

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

  11. Note the state of the Data List item. The item will change to Compl (Complete) as the O2 sensor monitor operates.

    Tech Tips

    If the item O2S (A/FS) Monitor does not change to Compl (Complete), and any pending DTCs fail to set, extend the driving time.

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

  13. Read pending DTC.

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

    Tech Tips

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

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

  16. Input the DTC P0136, P0137 or P0138.

  17. Check the DTC judgment result.

    Intelligent Tester
    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
    UNKNOWN

    • 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 shown ABNORMAL, the system has malfunction.

    • If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] and check the DTC judgment result again.

WIRING DIAGRAM

A011BXOE04

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following 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 (A/F) sensor, Heated Oxygen (HO2) 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. 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 in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume.)

  6. Monitor the output voltages of the A/F and HO2 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

(A/F)

 +25% Rich Less than 3.1 V

AFS Voltage B1S1

(A/F)

 -12.5% Lean More than 3.4 V

O2S B1S2

(HO2)

 +25% Rich More than 0.55 V

O2S B1S2

(HO2)

 -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 A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage Main Suspected Trouble Area
1 A011AJ8E01 A011A4HE04 A011AJ8E01 A011AXVE01 -
2 A011AJ8E01 A0116WSE01 A011AJ8E01 A011AXVE01

  • A/F sensor

  • A/F sensor heater

  • A/F sensor circuit
3 A011AJ8E01 A011A4HE04 A011AJ8E01 A0116WSE01

  • HO2 sensor

  • HO2 sensor heater

  • HO2 sensor circuit
4 A011AJ8E01 A0116WSE01 A011AJ8E01 A0116WSE01

  • Injector

  • Fuel pressure

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

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 an intelligent tester. 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.

  • If the OX1B wire from the ECM connector is short-circuited the +B wire, DTC P0136 will be set.

PROCEDURE


  1. READ OUTPUT DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Read DTCs.

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

    B

    CHECK FOR EXHAUST GAS LEAK Click here

    C

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

    D

    GO TO DTC CHART Click here

    A

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


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Allow the engine to idle.

    6. 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 INTELLIGENT TESTER (INJECTION VOLUME) Click here

    A

  3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)


    1. A011BJBE06
      Text in Illustration
      *a

      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) - 3 (OX1B) Always 10 kΩ or higher
      2 (+B) - 4 (E2) 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 (CHECK FOR SHORT)


    1. A011BPJE98
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Turn the ignition 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
      B8-63 (HT1B) - B8-80 (OX1B) Always 10 kΩ or higher

    4. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (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.

    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.

      • 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.

      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.

      A011ASXE22

    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 below 3 mA in this test.


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Clear DTCs Click here.

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


      1. Warm up the engine until the engine coolant temperature reaches 75°C (167°F) or more.

      2. Drive the vehicle at 60 km/h (37 mph) or more, and decelerate the vehicle for 5 seconds or more.

      3. Repeat the deceleration above at least 3 times.

        A0119G8E46

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

    7. Read the value of the air fuel ratio sensor current while the fuel-cut operation is performed.

      Standard Current
      Less than 3.0 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.


    OK

    REPLACE HEATED OXYGEN SENSOR Click here

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

  7. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (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 / O2S B1S2.

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

      Tech Tips


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

      • The heated oxygen sensor is displayed as O2S B1S2 on the tester.

      • 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 Voltage
      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 INTELLIGENT TESTER (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.

    6. Change the fuel injection volume using the tester, and monitoring the voltage output of air fuel ratio and heated oxygen sensors 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 tester.

      • 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.

      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.

      A011ASXE22

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

  9. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Check the MAP and Engine Speed in Date List at the idling condition while performing Active Test.

      OK
      MAP and idling condition change in response to EGR step position.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

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

      (EGR valve is fully closed)

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

      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 Active Test is completed.

      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK FROM SYSTEM)

    A

  10. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check for contamination between the EGR valve and housing.

      OK
      No leaks or blockage

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK FROM SYSTEM)

  11. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.

      OK
      No gas leaks.

    NG

    REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT

    OK

  12. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)


    1. A011BJBE06
      Text in Illustration
      *a

      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
      1 (HT1B) - 2 (+B) 20°C (68°F) 11 to 16 Ω
      3 (OX1B) - 4 (E2) Always 10 kΩ or higher

    3. Reconnect the heated oxygen sensor connector.


    NG

    REPLACE HEATED OXYGEN SENSOR Click here

    OK

  13. 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
      B19-1 (HT1B)*1 - B8-63 (HT1B) Always Below 1 Ω
      B19-3 (OX1B)*1 - B8-80 (OX1B) Always Below 1 Ω
      B19-4 (E2)*1 - B8-79 (O1B-) Always Below 1 Ω
      B20-1 (HT1B)*2 - B8-63 (HT1B) Always Below 1 Ω
      B20-3 (OX1B)*2 - B8-80 (OX1B) Always Below 1 Ω
      B20-4 (E2)*2 - B8-79 (O1B-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B19-1 (HT1B)*1 or B8-63 (HT1B) - Body ground Always 10 kΩ or higher
      B19-3 (OX1B)*1 or B8-80 (OX1B) - Body ground Always 10 kΩ or higher
      B19-4 (E2)*1 or B8-79 (O1B-) - Body ground Always 10 kΩ or higher
      B20-1 (HT1B)*2 or B8-63 (HT1B) - Body ground Always 10 kΩ or higher
      B20-3 (OX1B)*2 or B8-80 (OX1B) - Body ground Always 10 kΩ or higher
      B20-4 (E2)*2 or B8-79 (O1B-) - Body ground Always 10 kΩ or higher

      • *1: for CVT

      • *2: for Manual Transaxle

    4. Reconnect the heated oxygen sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. REPLACE HEATED OXYGEN SENSOR


    1. Replace the heated oxygen sensor Click here.


    NEXT

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


    1. Perform the confirmation driving pattern.

      Tech Tips

      Refer to the CONFIRMATION DRIVING PATTERN.

      Result
      Result Proceed to

      NORMAL

      (No DTC outputs)

      		 A

      ABNORMAL

      (P0136, P0137 or P0138 is output)

      		 B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION) Click here

    A

    END

  16. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. 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.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

    6. Check the MAP and Engine Speed in Date List at the idling condition while performing Active Test.

      OK
      MAP and idling condition change in response to EGR step position.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

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

      (EGR valve is fully closed)

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

      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 Active Test is completed.

      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE AIR FUEL RATIO SENSOR Click here

    A

  17. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check for contamination between the EGR valve and housing.

      OK
      No leaks or blockage

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    REPLACE AIR FUEL RATIO SENSOR Click here

  18. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor Click here.


    NEXT

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


    1. Perform the confirmation driving pattern.

      Tech Tips

      Refer to the CONFIRMATION DRIVING PATTERN.

      Result
      Result Proceed to

      NORMAL

      (No DTC outputs)

      		 A

      ABNORMAL

      (P0136, P0137 or P0138 is output)

      		 B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION) Click here

    A

    END

  20. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. 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.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

    6. Check the MAP and Engine Speed in Date List at the idling condition while performing Active Test.

      OK
      MAP and idling condition change in response to EGR step position.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

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

      (EGR valve is fully closed)

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

      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 Active Test is completed.

      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE HEATED OXYGEN SENSOR Click here

    A

  21. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check for contamination between the EGR valve and housing.

      OK
      No leaks or blockage

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

    REPLACE HEATED OXYGEN SENSOR Click here