DTC    P0136    Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)

DTC    P0137    Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)

DTC    P0138    Oxygen Sensor Circuit High Voltage (Bank 1 Sensor 2)

for Preparation Click here


DESCRIPTION

HINT:
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.

A112653E01


DTC No.
DTC Detection Condition
Trouble Area
P0136
  1. 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):
  1. (a) Heated oxygen sensor voltage does not decrease to less than 0.21 V
  2. (b) Heated oxygen sensor voltage does not increase to more than 0.70 V
  1. Open or short in heated oxygen sensor (bank 1 sensor 2) circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. Air fuel ratio sensor (bank 1 sensor 1)
  4. Gas leak from exhaust system
  5. EGR valve assembly
P0137
  1. 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):
  1. (a) Heated oxygen sensor voltage output less than 0.21 V
  2. (b) Target air fuel ratio rich
  1. Open in heated oxygen sensor (bank 1 sensor 2) circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. Gas leak from exhaust system
  4. Air fuel ratio sensor (bank 1 sensor 1)
  5. EGR valve assembly
P0138
  1. 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):
  1. (a) Heated oxygen sensor voltage output 0.70 V or more
  2. (b) Target air fuel ratio lean
  1. Short in heated oxygen sensor (bank 1 sensor 2) circuit
  2. Heated oxygen sensor (bank 1 sensor 2)
  3. Air fuel ratio sensor (bank 1 sensor 1)
  4. ECM

CONFIRMATION DRIVING PATTERN

HINT:
  1. This confirmation driving pattern is used in the "Perform Confirmation Driving Pattern" procedure of the following diagnostic troubleshooting procedure.
  2. 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.


A219582E02

  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.

    HINT:
    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.

    HINT:
    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
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    HINT:
    1. If the judgment result shown ABNORMAL, the system has malfunction.
    2. If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] and check the DTC judgment result again.


WIRING DIAGRAM


A201211E04


INSPECTION PROCEDURE

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

HINT:
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.

HINT:
  1. 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%.
  2. 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

NOTICE:
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
A150787E01
A151324E04
A150787E01
A150788E01
-
2
A150787E01
A150790E01
A150787E01
A150788E01
  1. A/F sensor
  2. A/F sensor heater
  3. A/F sensor circuit
3
A150787E01
A151324E04
A150787E01
A150790E01
  1. HO2 sensor
  2. HO2 sensor heater
  3. HO2 sensor circuit
4
A150787E01
A150790E01
A150787E01
A150790E01
  1. Injector
  2. Fuel pressure
  3. Gas leak from exhaust system (Air-fuel ratio extremely rich or lean)
  1. Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the A/F and HO2 sensors.
  2. To display the graph, enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 and O2S B1S2; then press the View button.

HINT:
  1. Sensor 1 refers to the sensor closest to the engine assembly.
  2. Sensor 2 refers to the sensor farthest away from the engine assembly.
  3. 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.
  4. If the OX1B wire from the ECM connector is short-circuited the +B wire, DTC P0136 will be set.

1.READ OUTPUT DTC

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. 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
Go to step 11

C
Go to step 7

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.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Allow the engine to idle.

  1. 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
Go to step 5
A


3.INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)


    A200916E06

  1. Disconnect the heated oxygen sensor connector.

  1. 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

    Text in Illustration 
    *a
    		Component without harness connected
    (Heated Oxygen Sensor)

  1. Reconnect the heated oxygen sensor connector.



NG
REPLACE HEATED OXYGEN SENSOR (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)


    A152957E98

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

  1. Disconnect the ECM connector.

  1. 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

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)

  1. 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.

  1. Start the engine.

  1. Turn the tester on.

  1. Warm up the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.



  1. 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.

    HINT:
    1. Change the fuel injection volume within the range of -12% and +12%.
    2. 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.
    3. 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

    HINT:
    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.


    A087979E22



NG
Go to step 18
OK


6.INSPECT AIR FUEL RATIO SENSOR

HINT:
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.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear DTCs (Click here).



  1. 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.


      A166581E46

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

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

    Standard Current:
    Less than 3.0 mA

    HINT:
    1. To measure the air fuel ratio sensor current precisely, perform the fuel-cut operation as long as possible.
    2. If it is difficult to measure the air fuel ratio sensor current, use the snapshot function of the intelligent tester.



OK
Go to step 14

NG
Go to step 18

7.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (INJECTION VOLUME)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the tester on.

  1. Warm up the engine.

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

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

    HINT:
    1. Change the fuel injection volume within the range of -12% and +12%.
    2. The heated oxygen sensor is displayed as O2S B1S2 on the tester.
    3. 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
Go to step 11
OK


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

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the tester on.

  1. Warm up the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.



  1. 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.

    HINT:
    1. Change the fuel injection volume within the range of - 12% and +12%.
    2. The air fuel ratio sensor is displayed as AFS Voltage B1S1, and the heated oxygen sensor is displayed as O2S B1S2 on the tester.
    3. 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

    HINT:
    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.


    A087979E22



NG
Go to step 18
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

    HINT:
    1. Do not leave the EGR valve open for 10 seconds or more during the Active Test.
    2. 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).

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

    OK:
    No leaks or blockage

  1. 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)


    A200916E06

  1. Disconnect the heated oxygen sensor connector.

  1. 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

    Text in Illustration 
    *a
    		Component without harness connected
    (Heated Oxygen Sensor)

  1. 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.

  1. Disconnect the ECM connector.

  1. 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. *1: for CVT
    2. *2: for Manual Transaxle

  1. Reconnect the heated oxygen sensor connector.

  1. 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.

    HINT:
    Refer to the CONFIRMATION DRIVING PATTERN.

    Result 
    Result
    		Proceed to
    NORMAL
    (No DTC outputs)
    		A
    ABNORMAL
    (P0136, P0137 or P0138 is output)
    		B



B
Go to step 16
A

END 

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

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

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / 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

    HINT:
    1. Do not leave the EGR valve open for 10 seconds or more during the Active Test.
    2. 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).

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

    OK:
    No leaks or blockage

  1. 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.

    HINT:
    Refer to the CONFIRMATION DRIVING PATTERN.

    Result 
    Result
    		Proceed to
    NORMAL
    (No DTC outputs)
    		A
    ABNORMAL
    (P0136, P0137 or P0138 is output)
    		B



B
Go to step 20
A

END 

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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

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

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / 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

    HINT:
    1. Do not leave the EGR valve open for 10 seconds or more during the Active Test.
    2. 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).

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

    OK:
    No leaks or blockage

  1. Reinstall the EGR valve assembly (Click here).



NG
REPLACE EGR VALVE ASSEMBLY (Click here)
OK

REPLACE HEATED OXYGEN SENSOR (Click here)