Part 2
2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0136-P0139, P0156-P0159: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
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) 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 LEAK
C -- READ VALUE USING TECHSTREAM (CONTROL THE INJECTION VOLUME)
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) Enter the following menus: Powertrain / Engine / Data List / All Data / O2S B1S2 or O2S B2S2.
(e) Allow the engine to idle.
(f) 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 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) Turn the engine switch off and wait for 5 seconds.
(b) Disconnect the A7 ECM connector.
(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 ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
5. PERFORM ACTIVE TEST USING TECHSTREAM (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) Enter the following menus: 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 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 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) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(e) Drive the vehicle according to the drive pattern listed below:
(1) Warm up the engine.
(2) Drive the vehicle at 60 km/h (37 mph) or more for 10 minutes or more.
(3) Stop the vehicle.
(4) Accelerate the vehicle to 60 km/h (40 mph) or more and decelerate for 5 seconds or more. Perform this 3 times.
(f) Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / Details.
(g) 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.
HINT
If the Techstream shows incomplete again, increase the vehicle speed and use second gear to decelerate the vehicle.
(h) Select RANGE B1S1 and RANGE B2S1.
(i) Read the test 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. READ VALUE 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.
(e) Warm up the engine.
(f) Enter the following menus: Powertrain / Engine / Data List / All Data / O2S B1S2 or O2S B2S2.
(g) 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 LEAK
OK -- Continue to next step.
8. PERFORM ACTIVE TEST USING TECHSTREAM (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) Enter the following menus: 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 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 output voltage, 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 (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK FROM FUEL SYSTEM) P0171
9. CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leakage.
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 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 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.
(f) Check if the STATUS is NORMAL. If STATUS is INCOMPLETE, perform the drive pattern again but increase 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, 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.
(f) Check if the STATUS is NORMAL. If STATUS is INCOMPLETE, perform the driving pattern again but increase the vehicle speed.
Result:
B -- REPLACE HEATED OXYGEN SENSOR
A -- END
18. CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leak.
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 minutes.
(b) Disconnect the A7 ECM connector.
(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 ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
20. PERFORM CONFIRMATION DRIVING PATTERN
(a) Perform Confirmation Driving Pattern (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 / Utility / All Readiness.
(e) Input DTCs: P0139 and P0159.
(f) Check if the STATUS is NORMAL. If STATUS is INCOMPLETE, perform the driving pattern and but increase vehicle speed.
Result:
B -- REPLACE HEATED OXYGEN SENSOR
A -- CHECK FOR INTERMITTENT PROBLEMS