Part 2

2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139,P0156-P0159: 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)

DTC P0156 - Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2)

DTC P0157 - Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2)

DTC P0158 - Oxygen Sensor Circuit High Voltage (Bank 2 Sensor 2)

DTC P0159 - Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)

(Continued)

- To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 or AFS Voltage B2S1 and O2S B1S2 or O2S B2S2 then press the graph button on the Data List view.

HINT
- Bank 1 refers to the bank that includes the No. 1 cylinder*.
- *: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
- Bank 2 refers to the bank that does not include the No. 1 cylinder.
- 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 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 wire from the ECM connector is short-circuited to the +B wire, DTC P0136 will be set.
- If the OX2B wire from the ECM connector is short-circuited to the +B wire, DTC P0156 will be set.

PROCEDURE

1. READ DTC OUTPUT

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Engine / Trouble Codes.

(d) Read the DTCs.

Result:





E -- GO TO DTC CHART SFI System

D -- CHECK FOR EXHAUST GAS LEAKS

C -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

B -- CHECK FOR EXHAUST GAS LEAKS
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) and turn the Techstream on.

(c) Enter the following menus: Powertrain / Engine / Data List / O2S B1S2 or O2S B2S2.

(d) Allow the engine to idle.

(e) Read the Heated Oxygen (HO2) 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) Disconnect the B24 oxygen sensor connector (Bank 1 Sensor 2) or B25 oxygen sensor connector (Bank 2 sensor 2).





(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 oxygen sensor connector.

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

4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Turn the engine switch off and wait for 5 seconds.

(b) Disconnect the B12 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

5. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Warm up the engine.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and AFS Voltage B2S1.

(f) Change the fuel injection volume using the Techstream, and monitoring 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 fine 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.
- 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 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 be below 3.0 mA in this test.

(a) Connect Techstream to the DLC3.

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

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

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





(1) Warm up the engine.

(2) Drive the vehicle at 37 mph (60 km/h) or more for 10 minutes or more and decelerate the vehicle for 5 seconds or more.

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

(3) Stop the vehicle.

(4) Accelerate the vehicle to 37 mph (60 km/h) or more and decelerate for 5 seconds or more. Perform this 3 times.

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

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

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

HINT
If the Techstream shown Incomplete again, increase the vehicle speed and use the second gear to decelerate the vehicle.

(g) Select the RANGE B1S1 and RANGE B2S1 Details.

(h) Read the value.

Standard current:

Less than 3.0 mA

NOTICE:
Do not turn the engine switch off during this step because the test results will be lost.

NG -- REPLACE AIR FUEL RATIO SENSOR

OK -- REPLACE HEATED OXYGEN SENSOR

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

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Warm up the engine.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume / All Data / O2S B1S2 or O2S B2S2.

(f) Change the fuel injection volume using the Techstream, monitoring the voltage output of the 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 fine gradations within this range.
- 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 0.5 V or higher.

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

8. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Warm up the engine.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume / All Data / AFS Voltage B1S1 and AFS Voltage B2S1.

(f) Change the fuel injection volume using the Techstream, and monitoring 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 fine 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.
- 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 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 -- CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (INJECTOR, FUEL PRESSURE, GAS LEAKAGE FROM EXHAUST SYSTEM)

9. CHECK FOR EXHAUST GAS LEAKS

(a) Check for exhaust gas leakage.

OK:

No gas leakage.

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

10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)

(a) Disconnect the B24 heated oxygen sensor connector (Bank 1 Sensor 2) or B25 heated oxygen sensor connector (Bank 2 sensor 2).





(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 heated oxygen sensor connector.

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

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

(a) Disconnect the B24 oxygen sensor connector (Bank 1 Sensor 2) or B25 oxygen sensor connector (Bank 2 sensor 2).

(b) Disconnect the B12 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 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

(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 stream 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 DTC: P0136, P0137, P0138, P0156, P0157 or P0158.

Check the DTC monitor is NORMAL. If the monitor is INCOMPLETE, perform the drive pattern again but increase 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) 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 DTC: P0136, P0138, P0156 or P0158.

Check the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern again but increase the vehicle speed.

Result:





B -- REPLACE HEATED OXYGEN SENSOR Removal

A -- END

18. CHECK FOR EXHAUST GAS LEAKS

(a) Check for exhaust gas leakage.

OK:

No gas leakage.

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

19. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)

(a) Turn the engine switch off and wait for 5 seconds.

(b) Disconnect the B12 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 -- Continue to next step.

20. PERFORM CONFIRMATION DRIVING PATTERN

(a) Refer to the confirmation driving pattern for P0139 and P0159.

NEXT -- Continue to next step.

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

(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 / Trouble Codes.

(e) Read the pending DTCs.

Result:





B -- REPLACE HEATED OXYGEN SENSOR Removal

A -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems