Part 2

2AZ-FXE ENGINE CONTROL: SFI SYSTEM: P0136-P0139: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0139 - Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 2)

P0139





1. Connect the Techstream to the DLC3.

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

3. Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

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 Component Tests and General Diagnostics.

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 47 mph (75 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 6 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 / Pending.

10. Read the pending DTC [D].

HINT
- 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: P0139.

13. Check the DTC judgment result.





HINT
If the judgment result shows INCOMPLETE or UNKNOWN, move the shift lever to B and then perform [C] and [D] again.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

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

(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Turn the Techstream on.
(d) Put the engine in inspection mode Component Tests and General Diagnostics.
(e) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor.
(g) Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
(h) Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT
- 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.





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.





- 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 / All Data / AFS Voltage B1S1 and O2S B1S2; and then press the graph button on the Data List view.

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

HINT
Read freeze frame data using the Techstream. The hybrid vehicle control ECU records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. READ OUTPUT DTC (DTC P0136, P0137, P0138 OR P0139)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

Result:





E -- GO TO DTC CHART SFI System

D -- READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

C -- READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

B -- CHECK FOR EXHAUST GAS LEAK
A -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in inspection mode Component Tests and General Diagnostics.

(e) Start the engine.

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

(g) Allow the engine to idle.

(h) Read the heated oxygen sensor output voltage while idling.

Result:





B -- PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)
A -- Continue to next step.

3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

(a) Turn the power switch off and wait for 5 minutes or more.





(b) Disconnect the heated oxygen sensor connector.

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

Standard Resistance:





Text in Illustration





(d) Reconnect the heated oxygen sensor connector.

NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Short):





(c) Reconnect the hybrid vehicle control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

5. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in inspection mode Component Tests and General Diagnostics.

(e) Start the engine and warm it up.

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

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

HINT
- Change the fuel injection volume within the range of -12% to +12%. The injection volume can be changed in 1% graduations within the 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.

Result:





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 below or higher 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
OK -- Continue to next step.

6. INSPECT AIR FUEL RATIO SENSOR

HINT
This air fuel ratio sensor test is to check the air fuel ratio sensor current during fuel-cut. When the sensor is normal, the sensor current indicates less than 3.0 mA in this test.

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Drive the vehicle according to the drive pattern listed below:

(1) Put the engine in inspection mode Component Tests and General Diagnostics.

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

(3) Drive the vehicle at 47 mph (75 km/h) or more and decelerate the vehicle for 6 seconds or more.

(4) Repeat the step above at least 3 times.





(f) Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details.

(g) Confirm that RANGE B1S1 / Result is either Pass or Fail. If the Techstream shows Fail, recheck RANGE B1S1 / Result after performing the drive pattern.

(h) Enter the RANGE B1S1 / Details.

(i) Read the test value.

Standard current:

Less than 3.0 mA

HINT
If the Techstream shows Fail again, add the vehicle speed and move the shift lever to B to decelerate the vehicle.

NG -- REPLACE AIR FUEL RATIO SENSOR

OK -- REPLACE HEATED OXYGEN SENSOR

7. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in inspection mode Component Tests and General Diagnostics.

(e) Start the engine and warm it up.

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

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

HINT
- Change the fuel injection volume within the range of -12% and +12%. The injection volume can be changed in 1% graduations within the range.
- The heated oxygen sensor is displayed as O2S B1S2 on the Techstream.
- 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 higher.

NG -- CHECK FOR EXHAUST GAS LEAK
OK -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in inspection mode Component Tests and General Diagnostics.

(e) Start the engine and warm it up.

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

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

HINT
- Change the fuel injection volume within the range of -12% to +12%. The injection volume can be changed in 1% graduations within the 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.

Result:





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 below or higher 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

OK -- CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK, ETC) P0171

9. CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No gas leaks.

NG -- REPAIR OR REPLACE EXHAUST GAS LEAK POINT
OK -- Continue to next step.

10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

(a) Disconnect the heated oxygen sensor connector.





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

Standard Resistance:





Text in Illustration





(c) Reconnect the heated oxygen sensor connector.

NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the heated oxygen sensor connector.

(b) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the heated oxygen sensor connector.

(e) Reconnect the hybrid vehicle control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. REPLACE HEATED OXYGEN SENSOR

(a) Replace the heated oxygen sensor Removal.

NEXT -- Continue to next step.

13. PERFORM CONFIRMATION DRIVING PATTERN

(a) Connect the Techstream to the DLC3.

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

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the power switch off and wait for 30 seconds.

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

(f) Put the engine in inspection mode Component Tests and General Diagnostics.

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

(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137 or P0138.

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

(e) Input DTCs: P0136, P0137 and P0138.

(f) Check the DTC judgment.

HINT
If STATUS is INCOMPLETE or UNKNOWN, perform the drive pattern adding the vehicle speed.

Result:





B -- REPLACE AIR FUEL RATIO SENSOR Removal

A -- END

15. REPLACE AIR FUEL RATIO SENSOR

(a) Replace the air fuel ratio sensor Removal.

NEXT -- Continue to next step.

16. PERFORM CONFIRMATION DRIVING PATTERN

(a) Connect the Techstream to the DLC3.

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

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the power switch off and wait for 30 seconds.

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

(f) Put the engine in inspection mode Component Tests and General Diagnostics.

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

(h) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern for P0136, P0137 or P0138.

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

(e) Input DTCs: P0136 and P0138.

(f) Check the DTC judgment.

HINT
If STATUS is INCOMPLETE or UNKNOWN, perform the drive pattern adding the vehicle speed.

Result:





B -- REPLACE HEATED OXYGEN SENSOR Removal

A -- END

18. READ VALUE USING TECHSTREAM (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

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

(e) Put the engine in inspection mode Component Tests and General Diagnostics.

(f) Start the engine.

(g) Allow the engine to idle.

(h) Read the heated oxygen sensor output voltage while idling.

Result:





B -- READ DTC OUTPUT (DTC P0139 IS OUTPUT AGAIN)
A -- Continue to next step.

19. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

(a) Disconnect the heated oxygen sensor connector.





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

Standard Resistance:





Text in Illustration





(c) Reconnect the heated oxygen sensor connector.

NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.

20. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Disconnect the hybrid vehicle control ECU connector.

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

Standard Resistance (Check for Short):





(c) Reconnect the hybrid vehicle control ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

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

(a) Connect the Techstream to the DLC3.





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

(c) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(d) Turn the power switch off and wait for 30 seconds.

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

(f) Put the engine in inspection mode Component Tests and General Diagnostics.

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

(h) Drive the vehicle at 47 mph (75 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 6 seconds or more to perform the fuel-cut [C].

(i) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness [D].

(j) Input DTC: P0139.

(k) Check that the result is NORMAL. If result is INCOMPLETE, perform the drive pattern adding the vehicle speed and move the shift lever to B to decelerate the vehicle.

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

A -- REPLACE HEATED OXYGEN SENSOR Removal