Part 2

2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,P0156-P0159: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0159 - Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)


Continued



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, select the following menu items: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1 S1 or AFS Voltage B2 S1 and O2S B1 S2 or O2S B2 S2.

HINT
- Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction Freeze Frame Data.
- If the OX1B or OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0136 or P0156 may be set.
PROCEDURE

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

(a) Connect the Techstream to the DLC3.

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

(c) Select the following menu items: Powertrain / Engine / Trouble Codes.

(d) Read the DTCs.

Result:





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 engine switch on (IG).

(c) Turn the Techstream on.

(d) Select the following menu items: Powertrain / Engine / Data List / A/F Control System / O2S B1 S2 or O2S B2 S2.

(e) Allow the engine to idle.

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

Result:





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

3. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

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





(b) Disconnect the K34*1, K57*2 or V35*3 heated oxygen (HO2) sensor connector.

- *1: Bank 1 Sensor 2

- *2: Bank 2 Sensor 2 (2WD)

- *3: Bank 2 Sensor 2 (4WD)

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

Standard resistance (Bank 1 Sensor 2):





Standard resistance (Bank 2 Sensor 2):





(d) Reconnect the HO2 sensor connector.

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

4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Disconnect the A7 ECM connector.

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

Standard resistance (Bank 1 Sensor 2):





Standard resistance (Bank 2 Sensor 2):





(c) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM

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

(a) Connect Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Select the following menu items: Powertrain / Engine / Active Test / Control the Injection Volume.

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

Result:





HINT
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
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 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 engine switch on (IG).

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

(3) Repeat the deceleration above at least 3 times.





(e) Select the following menu items: Powertrain / Engine / Monitor / O2 Sensor / Details.

(f) Confirm that RANGE B1S1 and RANGE B2S1 are either Pass or Fail. If the Techstream shows Incomplete, recheck RANGE B1S1 and RANGE B2S1 after performing the drive pattern.

(g) Select RANGE B1S1 and RANGE B2S1.

(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 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 engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine.

(e) Select the following menu items: Powertrain / Engine / Data List / O2S B1 S2 or O2S B2 S2.

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

(g) Read the output voltage of the heated oxygen sensor when the engine rpm is suddenly increased.

HINT
Quickly accelerate the engine to 4000 rpm 3 times depressing the accelerator pedal.

Standard:

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

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 engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Select the following menu items: Powertrain / Engine / Active Test / Control the Injection Volume.

(f) Change the fuel injection volume using the Techstream, and monitor the voltage output of air fuel ratio and heated oxygen sensors 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 air fuel ratio sensor is displayed as AFS Voltage B1 S1 or AFS Voltage B2 S1, and the heated oxygen sensor is displayed as O2S B1 S2 or O2S B2 S2 on the Techstream.

Result:





HINT
A normal heated oxygen sensor voltage (O2S B1 S2 or O2S B2 S2) 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 output voltage, 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. CHECK FOR EXHAUST GAS LEAK

OK:

No gas leak.

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

10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

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

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

(a) Disconnect the K34*1, K57*2 or V35*3 heated oxygen sensor connector.

- *1: Bank 1 Sensor 2

- *2: Bank 2 Sensor 2 (2WD)

- *3: Bank 2 Sensor 2 (4WD)

(b) Disconnect the A7 ECM connector.

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

Standard resistance (Check for open):

Bank 1
Bank 2 (2WD)
Bank 2 (4WD)














Standard resistance (Check for short):

Bank 1
Bank 2 (2WD)
Bank 2 (4WD)














(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 Components

NEXT -- Continue to next step.

13. PERFORM CONFIRMATION DRIVING PATTERN

(a) Refer to the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158.

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Input DTCs: P0136, P0137, P0138, P0156, P0157 or P0158.

Check that RESULT is NORMAL. If RESULT is INCOMPLETE, perform the drive pattern adding the vehicle speed.

Result:





B -- REPLACE AIR FUEL RATIO SENSOR

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) Refer to the confirmation driving pattern for P0136, P0137, P0138, P0156, P0157 and P0158.

NEXT -- Continue to next step.

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

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

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

(e) Input DTCs: P0136, P0138, P0156 or P0158.

Result:





B -- REPLACE HEATED OXYGEN SENSOR

A -- END

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

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / A/F Control System / O2S B1 S2 or O2S B2 S2.

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

(f) Engine is idling.

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

(h) Read the output voltage of the heated oxygen sensor.

Result:





B -- READ VALUE USING DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN)
A -- Continue to next step.

19. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)

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





(b) Disconnect the K34*1, K57*2 or V35*3 heated oxygen (HO2) sensor connector.

- *1: Bank 1 Sensor 2

- *2: Bank 2 Sensor 2 (2WD)

- *3: Bank 2 Sensor 2 (4WD)

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

Standard resistance (Bank 1 Sensor 2):





Standard resistance (Bank 2 Sensor 2):





(d) Reconnect the HO2 sensor connector.

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

20. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Disconnect the A7 ECM connector.

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

Standard resistance (Bank 1 Sensor 2):





Standard resistance (Bank 2 Sensor 2):





(c) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM

21. READ VALUE USING DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN)

(a) Connect the Techstream to the DLC3.

(b) Clear the DTC DTC Check / Clear.

(c) Start the engine. [A]

(d) Warm-up the engine until the engine coolant temperature is 75°(167°F) or more. [B]

(e) Drive the vehicle 37 mph (60 km/h) and decelerate the vehicle for 7 seconds or more. [C]

(f) Turn the Techstream on.

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

(h) Input DTCs: P0139 and P0159.

(i) Check that STATUS is NORMAL. If STATUS is Incomplete, perform the driving pattern increasing the vehicle speed and using the second gear to decelerate the vehicle.





Result:





B -- REPLACE HEATED OXYGEN SENSOR

A -- CHECK FOR INTERMITTENT PROBLEMS