Part Two
1UR-FE ENGINE CONTROL: SFI SYSTEM: P0136-P0139,P0156-P0159: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
6. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- REPLACE ECM Removal
7. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream on.
(c) Start the engine.
(d) Warm up the engine.
(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 (A/F) and HO2 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% gradations within this range.
- The A/F sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the HO2 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 HO2 sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel injection volumes. When the A/F sensor voltage remains at either less or more than 3.3 V despite the HO2 sensor indicating a normal reaction, the A/F sensor is malfunctioning.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- Continue to next step.
8. 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 mA in this test.
(a) Clear DTCs DTC Check / Clear.
(b) Drive the vehicle according to the drive pattern as listed below:
(1) Warm up the engine.
(2) Drive the vehicle at 60 km/h (40 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.
(c) Enter the following menus: Powertrain / Engine and ECT / Monitor / O2 Sensor / Details.
(d) 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.
(e) Select RANGE B1S1 and press ENTER.
(f) Read the test value.
Standard current:
Less than 3.0 mA
NOTICE:
Do not turn the ignition switch off during this step because the test results will be lost.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- REPLACE HEATED OXYGEN SENSOR
9. 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 and ECT / 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 HO2 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% 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 more.
NG -- CHECK FOR EXHAUST GAS LEAK
OK -- Continue to next step.
10. PERFORM ACTIVE TEST USING TECHSTREAM (INJECTION VOLUME)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream on.
(c) Start the engine.
(d) Warm up the engine.
(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 (A/F) and HO2 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% gradations within this range.
- The A/F sensor is displayed as AFS Voltage B1S1 or AFS Voltage B2S1, and the HO2 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 HO2 sensor voltage (O2S B1S2 or O2S B2S2) reacts in accordance with increases and decreases in fuel injection volumes. When the A/F sensor voltage remains at either less or more than 3.3 V despite the HO2 sensor indicating a normal reaction, the A/F sensor is malfunctioning.
NG -- REPLACE AIR FUEL RATIO SENSOR
OK -- Continue to next step.
11. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
NG -- INSPECT EGR VALVE
OK -- CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS LEAK FROM SYSTEM)
12. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- CHECK EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO AND REPAIR CAUSE (FUEL INJECTOR ASSEMBLY, FUEL PRESSURE, GAS LEAK FROM SYSTEM)
13. 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.
14. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) P0037
NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.
15. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM)
(a) Disconnect the HO2 sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
16. REPLACE HEATED OXYGEN SENSOR
(a) Replace the heated oxygen sensor Removal.
NEXT -- Continue to next step.
17. PERFORM CONFIRMATION DRIVING PATTERN
(a) Perform the CONFIRMATION DRIVING PATTERN (P0136, P0137, P0138, P0156, P0157 and P0158).
NEXT -- Continue to next step.
18. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158 IS OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(d) Input DTCs: P0136, P0137, P0138, P0156, P0157 and P0158.
(e) Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern increasing the vehicle speed.
Result:
B -- END
A -- Continue to next step.
19. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
NG -- INSPECT EGR VALVE
OK -- REPLACE AIR FUEL RATIO SENSOR Removal
20. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- REPLACE AIR FUEL RATIO SENSOR Removal
21. REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor Removal.
NEXT -- Continue to next step.
22. PERFORM CONFIRMATION DRIVING PATTERN
(a) Perform the CONFIRMATION DRIVING PATTERN (P0136, P0137, P0138, P0156, P0157 and P0158).
NEXT -- Continue to next step.
23. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136, P0137, P0138, P0156, P0157 OR P0158 IS OUTPUT AGAIN)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream ON.
(c) Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
(d) Input DTCs: P0136, P0137, P0138, P0156, P0157 and P0158.
(e) Check that the DTC monitor is NORMAL. If the DTC monitor is INCOMPLETE, perform the drive pattern increasing the vehicle speed.
Result:
B -- END
A -- Continue to next step.
24. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
NG -- INSPECT EGR VALVE
OK -- REPLACE HEATED OXYGEN SENSOR Removal
25. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- REPLACE HEATED OXYGEN SENSOR Removal
26. 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 / All Data / O2S B1S2 or O2S B2S2.
(e) After warming up the engine, run the engine at an engine speed of 2500 rpm for 3 minutes.
(f) Idle the engine.
(g) Depress the accelerator pedal quickly until the engine speed reaches 2500 rpm 3 times.
Result
B -- PERFORM CONFIRMATION DRIVING PATTERN
A -- Continue to next step.
27. INSPECT HEATED OXYGEN SENSOR (CHECK FOR SHORT)
(a) Disconnect the HO2 sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.
28. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Turn the ignition switch off and wait for 5 minutes.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
29. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
NG -- INSPECT EGR VALVE
OK -- REPLACE ECM Removal
30. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- REPLACE ECM Removal
31. PERFORM CONFIRMATION DRIVING PATTERN
(a) Perform the CONFIRMATION DRIVING PATTERN (P0139 and P0159).
NEXT -- Continue to next step.
32. READ DTC OUTPUT (DTC P0139 OR P0159 IS OUTPUT AGAIN)
(a) Read the DTCs DTC Check / Clear.
Result
B -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems
A -- Continue to next step.
33. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.
(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.
HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.
OK:
MAP and idling condition change in response to EGR step position as follows.
Standard:
NG -- INSPECT EGR VALVE
OK -- REPLACE HEATED OXYGEN SENSOR Removal
34. INSPECT EGR VALVE
(a) Remove the EGR valve assembly Removal.
(b) Check if the EGR valve is stuck open.
OK:
EGR valve is tightly closed.
NG -- REPLACE EGR VALVE Removal
OK -- REPLACE HEATED OXYGEN SENSOR Removal