Part 2

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

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)

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


(Continued)


5. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

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

(f) 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.

Result:





HINT
A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volume. 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 A/F sensor test is to check the A/F sensor current during the fuel-cut. When the sensor is normal, the sensor current will indicate below 3.0 mA in this test.

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the Techstream on.

(d) Drive the vehicle according to the drive pattern 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.





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

(f) Confirm that RANGE B1S1 is either Pass or Fail. If the Techstream shows Incomplete, re-check RANGE B1S1 after performing the drive pattern.

(g) Select the RANGE B1S1.

(h) Read the Test Value.

Standard current:

Less than 3.0 mA

HINT
If the Techstream shows Incomplete again, increase the vehicle speed and use the second gear to decelerate the vehicle. Refer to the Confirmation Driving Pattern.

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 ignition switch to ON.

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

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

(f) 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.

Standard:

Fluctuates between 0.4 V or less and 0.5 V or more.

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

8. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

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

(f) 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.

Result:





HINT
A normal heated oxygen sensor voltage (O2S B1S2) reacts in accordance with increases and decreases in fuel injection volume. 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 ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO

9. INSPECT FOR EXHAUST GAS LEAK

(a) Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.

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) Inspect the heated oxygen sensor Heated Oxygen Sensor.

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

11. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)

(a) Disconnect the heated oxygen sensor connector.





(b) Disconnect the ECM 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 ECM 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

HINT
Refer to the CONFIRMATION DRIVING PATTERN.

NEXT -- Continue to next step.

14. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, OR P0139)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the Techstream on.

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

(e) Read the DTCs.

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

HINT
Refer to CONFIRMATION DRIVING PATTERN.

NEXT -- Continue to next step.

17. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138 OR P0139)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the Techstream on.

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

(e) Read the DTCs.

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 ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / A/F Control System / O2S B1S2.

(e) After warming up the engine, run the engine at an engine speed of 2500 rpm for 3 minutes.

(f) Allow the engine to idle.

(g) Depress the accelerator pedal quickly until the engine speed reaches 2500 rpm for 3 minutes.

Result:





B -- 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:





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





(b) Disconnect the ECM connector.

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

Standard resistance:





(d) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

21. DTC OUTPUT (DTC P0139 IS OUTPUT AGAIN)

(a) Connect the Techstream to the DLC3.





(b) Turn the ignition switch to ON and turn the Techstream on.

(c) Clear the DTC (even if no DTC are stored, perform the Clear DTC procedure) DTC Check / Clear.

(d) Turn the ignition switch off.

(e) Turn the ignition switch to ON and turn the Techstream on [A].

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

(g) Drive the vehicle at 37 mph (60 km/h), and then decelerate the vehicle by releasing the accelerator pedal for 7 seconds or more to perform the fuel cut [C].

(h) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending [D].

(i) Read the DTC.

Result:





B -- CHECK INTERMITTENT PROBLEMS

A -- REPLACE HEATED OXYGEN SENSOR Removal