Part 2
2GR-FSE ENGINE CONTROL: SFI SYSTEM: P0136-P0139,P0156-P0159: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0159 - Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 2)
PART 2
INSPECTION PROCEDURE
HINT
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.
1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Turn the Techstream on.
4. Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
6. Perform the Active Test operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
7. Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.
HINT
- The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
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, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT
- Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from transmission.
- 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- 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 (DTC P0136, P0137, P0138, P0139, P0156, P0157, P0158 OR P0159)
(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 DTCs.
Result:
E -- GO TO DTC CHART SFI System
D -- CHECK EXHAUST GAS LEAK
C -- READ VALUE USING TECHSTREAM (O2S B1S2 OR O2S B2S2)
B -- INSPECT 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 / A/F Control System / 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.
(b) Disconnect the heated oxygen sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
(d) Reconnect the heated oxygen sensor connector.
NG -- REPLACE HEATED OXYGEN SENSOR Removal
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Short):
(c) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (HEATED OXYGEN SENSOR - ECM)
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.
(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 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. CHECK 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 DTC Reading and Clearing Diagnostic Trouble Codes.
(e) Drive the vehicle by the drive pattern as 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 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 B1S1and 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 shows Incomplete again, increase the vehicle speed and use the second gear to decelerate the vehicle.
(h) Select the 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 (O2S B1S2 OR O2S B2S2)
(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, and monitoring the voltage output of heated oxygen sensor 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 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.
Standard:
Fluctuates between 0.4 V or less and 0.55 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) 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.
(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 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 -- CHECK AND REPLACE EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO (FUEL INJECTOR, FUEL PRESSURE, GAS LEAK FROM SYSTEM, ETC.) P0171
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 LEAKAGE POINT
OK -- Continue to next step.
10. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE)
(a) Turn the engine switch off and wait for 5 minutes.
(b) Disconnect the heated oxygen sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
(d) 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 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 (HEATED OXYGEN SENSOR - ECM)
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 DTC: P0136, P0137, P0138, P0156, P0157 or P0158.
(f) Check the Status is NORMAL. If Status is INCOMPLETE, perform the driving pattern adding 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, P0158 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.
(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 Removal
A -- END
18. CHECK EXHAUST GAS LEAK
(a) Check for exhaust gas leak.
OK:
No gas leakage.
B -- REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT
A -- 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 A6 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 Removal
A -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems