Toyota Yaris: Sfi System / A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold (P227118)
DESCRIPTION
Refer to DTC P003612.
Click here
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P227118 | A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold | While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is less than 7.5 mA for 0.5 seconds or more (2 trip detection logic). |
| Comes on | SAE: P2271 |
HINT:
- DTC P227118 indicate malfunctions related to the sensor 2 air fuel ratio sensor circuit.
- When any of these DTCs are stored, check the air fuel ratio sensor (sensor 2) current output by entering the following menus on the GTS: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S2.
- Short-term fuel trim values can also be read using the GTS.
- If an air fuel ratio sensor (sensor 2) malfunction is detected, the ECM will store a DTC.
MONITOR DESCRIPTION
A rich air fuel mixture causes a low air fuel ratio sensor (sensor 2) current, and a lean air fuel mixture causes a high air fuel ratio sensor (sensor 2) current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor (sensor 2) current during fuel-cut and detects any abnormal current values.
If the air fuel ratio sensor (sensor 2) output is less than 7.5 mA for 0.5 seconds or more of cumulative time, the ECM stores DTC P227118 (stuck on low side).
MONITOR STRATEGY
| Required Sensors/Components (Main) | Air fuel ratio sensor (sensor 2) |
| Required Sensors/Components (Related) | Crankshaft position sensor Engine coolant temperature sensor Throttle position sensor |
| Frequency of Operation | Once per driving cycle |
TYPICAL ENABLING CONDITIONS
| Auxiliary battery voltage | 11 V or higher |
| Engine coolant temperature | 75°C (167°F) or higher |
| Atmospheric pressure | 76 kPa(abs) [11.02 psi(abs)] or higher |
| Fuel cut | On |
TYPICAL MALFUNCTION THRESHOLDS
| Duration of following condition | 0.5 seconds or more |
| Air fuel ratio sensor (sensor 2) current | Less than 7.5 mA |
CONFIRMATION DRIVING PATTERN
- Connect the GTS to the DLC3.
- Turn the ignition switch to ON.
- Turn the GTS on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON.
- Turn the GTS on.
- Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].
-
Drive the vehicle at approximately 75 km/h (46 mph) for 10 minutes or more [B].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
Drive the vehicle while keeping the engine load as constant as possible.
- Using the GTS, enter the following menus to check the fuel-cut status: Powertrain / Engine / Data List / Idle Fuel Cut.
-
With the shift lever in 2nd gear, drive the vehicle at 75 km/h (46 mph), and then decelerate the vehicle by releasing the accelerator pedal for 10 seconds or more to perform the fuel-cut [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
While "Idle Fuel Cut" on the Data List is ON, fuel-cut control is being executed.
- Repeat step [C] 2 times or more in one driving cycle.
- Enter the following menus: Powertrain / Engine / Trouble Codes / Pending [D].
-
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P227118.
-
Check the DTC judgment result.
GTS Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
HINT:
- If the judgment result is NORMAL, the system is normal.
- If the judgment result is ABNORMAL, the system is malfunctioning.
- If the judgment result is INCOMPLETE, drive the vehicle with the shift lever in 2nd gear, and then perform step [C] again.
WIRING DIAGRAM
Refer to DTC P003612.
Click here
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- Read Freeze Frame Data using the GTS. 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.
- Sensor 1 refers to the sensor closest to the engine assembly.
- Sensor 2 refers to the sensor farthest away from the engine assembly.
PROCEDURE
| 1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P227118) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes| Result | Proceed to |
|---|---|
| P227118 is output | A |
| P227118 and other DTCs are output | B |
HINT:
If any DTCs other than P227118 or P227318 are output, troubleshoot those DTCs first.
| B |
 | GO TO DTC CHART |
|
| 2. | CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST |
(a) Has the vehicle run out of fuel in the past?
| NO |
 | GO TO STEP 5 |
|
| 3. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
| 4. | CHECK WHETHER DTC OUTPUT RECURS (DTC P227118) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Enter the following menus.
Powertrain > Engine > Utility| Tester Display |
|---|
| All Readiness |
(c) Input the DTC: P227118.
(d) Check the DTC judgment result.
| Result | Proceed to |
|---|---|
| NORMAL (DTCs are not output) | A |
| ABNORMAL (P227118 is output) | B |
| A |
 | DTC CAUSED BY RUNNING OUT OF FUEL |
| B |
 | GO TO STEP 5 |
| 5. | CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
| 6. | READ VALUE USING GTS (A/F (O2) SENSOR CURRENT) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Enter the following menus.
Powertrain > Engine > Data List| Tester Display |
|---|
| A/F (O2) Sensor Current B1S2 |
(c) Check the test value of the air fuel ratio sensor output (sensor 2) current during fuel-cut, referring to the Driving Pattern Detail for [C] in the Confirmation Driving Pattern.
HINT:
- To measure the air fuel ratio sensor (sensor 2) current precisely, perform the fuel-cut operation as long as possible.
- If it is difficult to measure the air fuel ratio sensor (sensor 2) current, use the snapshot function of the GTS.
| Test Value | Proceed to |
|---|---|
| Within normal range (7.5 mA or higher) | A |
| Outside normal range (Less than 7.5 mA) | B |
| B |
 | GO TO STEP 15 |
|
| 7. | PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR) |
(a) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
(b) Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.
(c) Enter the following menus.
Powertrain > Engine > Active Test| Active Test Display |
|---|
| Control the Injection Volume for A/F Sensor |
| Data List Display |
|---|
| A/F (O2) Sensor Current B1S1 |
| A/F (O2) Sensor Current B1S2 |
(d) Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.
(e) Monitor the output values of the air fuel ratio sensor (sensor 1) and air fuel ratio sensor (sensor 2) (A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2 displayed on the GTS.
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 12.5%.
- The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.
- If the sensor output value does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.
| GTS Display (Sensor) | Injection Volume | Status | Current |
|---|---|---|---|
| A/F (O2) Sensor Current B1S1 (Air fuel ratio (sensor 1)) | 12.5% | Rich | Below -0.075 mA |
| -12.5% | Lean | More than 0.037 mA | |
| A/F (O2) Sensor Current B1S2 (Air fuel ratio (sensor 2)) | 12.5% | Rich | Below -0.86 mA |
| -12.5% | Lean | More than 0.33 mA |
| Status of A/F (O2) Sensor Current B1S1 | Status of A/F (O2) Sensor Current B1S2 | Air Fuel Ratio Condition and Air Fuel Ratio Sensor (Sensor 2) Condition | Proceed to |
|---|---|---|---|
| Lean | Lean | Actual air fuel ratio lean | A |
| Rich | Rich | Actual air fuel ratio rich | |
| Lean/Rich | Lean | Air fuel ratio sensor (sensor 2) malfunction | B |
| Lean/Rich | Rich | Air fuel ratio sensor (sensor 2) malfunction | |
| Lean/Rich | Lean/Rich | Normal |
- Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently more than 0.037 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently more than 0.33 mA.
- Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output current (A/F (O2) Sensor Current B1S1) is consistently below -0.075 mA, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.
- Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output current of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.
HINT:
Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2].
Click here
| B |
 | GO TO STEP 15 |
|
| 8. | CHECK INTAKE SYSTEM |
(a) Check the intake system for vacuum leaks.
Click here
OK:
No leaks in the intake system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the intake system.
Click here
| NG |
 | REPAIR OR REPLACE INTAKE SYSTEM |
|
| 9. | CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks in exhaust system.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system.
Click here
| NG |
 | REPAIR OR REPLACE EXHAUST SYSTEM |
|
| 10. | CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE) |
(a) Check the fuel pressure (for low pressure side).
Click here
| NG |
 | GO TO STEP 14 |
|
| 11. | INSPECT PORT FUEL INJECTOR ASSEMBLY |
(a) Inspect the port fuel injector assembly (whether fuel volume is high or low, and whether injection pattern is poor).
Click here
HINT:
Perform "Inspection After Repair" after replacing the port fuel injector assembly.
Click here
| NG |
 | REPLACE PORT FUEL INJECTOR ASSEMBLY |
|
| 12. | READ VALUE USING GTS (FUEL PRESSURE (HIGH)) |
(a) Start the engine.
(b) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.
(c) Enter the following menus.
Powertrain > Engine > Data List| Tester Display |
|---|
| Fuel Pressure (High) |
| Injection Mode |
(d) According to the display on the GTS, read the Data List.
Standard:
| GTS Display | Condition | Specified Condition |
|---|---|---|
| Fuel Pressure (High) |
| 2800 to 20000 kPag |
| NG |
 | REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE) |
|
| 13. | INSPECT DIRECT FUEL INJECTOR ASSEMBLY |
Click here
HINT:
Perform "Inspection After Repair" after replacing the direct fuel injector assembly.
Click here
| OK |
 | GO TO STEP 15 |
| NG |
 | REPLACE DIRECT FUEL INJECTOR ASSEMBLY |
| 14. | CHECK FUEL LINE |
(a) Check the fuel lines for leaks or blockage.
| OK |
 | GO TO FUEL PUMP CONTROL CIRCUIT |
| NG |
 | REPAIR OR REPLACE FUEL SYSTEM |
| 15. | REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) |
Click here
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).
Click here
|
| 16. | CLEAR DTC |
(a) Connect the GTS to the DLC3.
(b) Turn the ignition switch to ON
(c) Turn the GTS on.
(d) Clear the DTCs.
Powertrain > Engine > Clear DTCs(e) Turn the ignition switch off and wait for at least 30 seconds.
|
| 17. | CHECK WHETHER DTC OUTPUT RECURS (DTC P227118) |
(a) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
(b) Enter the following menus.
Powertrain > Engine > Utility| Tester Display |
|---|
| All Readiness |
(c) Input the DTC: P227118.
(d) Check the DTC judgment result.
| Result | Proceed to |
|---|---|
| NORMAL (DTCs are not output) | A |
| ABNORMAL (P227118 is output) | B |
| A |
 | END |
| B |
 | REPLACE ECM |
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Fuel Gauge
The fuel gauge shows approximately how much fuel is remaining in the tank when the ignition is switched ON. We recommend keeping the tank over 1/4 full.
