SFI SYSTEM, Diagnostic DTC:P227118, P227318

DTC Code	DTC Name
P227118	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold
P227318	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2 Circuit Current Below Threshold

DESCRIPTION

Refer to DTC P003612.

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	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 (bank 1 sensor 2) current is less than 7.5 mA for 0.5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 2) circuit Air fuel ratio sensor (bank 1 sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel system ECM	Comes on	DTC stored	SAE Code: P2271
P227318	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2 Circuit Current Below Threshold	While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (bank 2 sensor 2) current is less than 7.5 mA for 0.5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 2) circuit Air fuel ratio sensor (bank 2 sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Fuel injector assembly (for port injection) Fuel injector assembly (for direct injection) Fuel system ECM	Comes on	DTC stored	SAE Code: P2273

Tech Tips

DTC P227118 indicate malfunctions related to the bank 1 sensor 2 air fuel ratio sensor (sensor 2) circuit.
DTC P227318 indicate malfunctions related to the bank 2 sensor 2 air fuel ratio sensor (sensor 2) circuit.
When any of these DTCs are stored, check the air fuel ratio sensor (sensor 2) voltage output by entering the following menus on the GTS: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2.
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 abnormal current values.

If the air fuel ratio sensor (sensor 2) output is less than 7.5 mA for 1 second or more of cumulative time, the ECM stores DTC P227118 or P227318 (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
Duration	10 seconds

TYPICAL ENABLING CONDITIONS

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
Time after engine start	3 seconds or more

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 engine switch on (IG).
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with park (P) selected [A].

Tech Tips

In order to keep the idle stable, turn off the A/C and all other electric loads and do not perform any shift operations.
With the engine running, 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.
Tech Tips
- Drive the vehicle while keeping the engine load as constant as possible.
- If the engine stops, further depress the accelerator pedal to restart the engine.
With shift state M selected and the engine running, 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.

Tech Tips

If the engine stops, further depress the accelerator pedal to restart the engine.
Repeat step [C] 2 times or more in one driving cycle.
Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
Read the pending DTCs [D].
Tech Tips
- 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 or P227318.

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

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system is malfunctioning.
If the judgment result shows INCOMPLETE, drive the vehicle with shift state M selected, and then perform step [C] again.

WIRING DIAGRAM

Refer to DTC P003612.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Bank 1 refers to the bank that includes the No. 1 cylinder*.

*: The No. 1 cylinder is the cylinder which is farthest from the 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 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.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO P227118 OR P227318)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Result	Proceed to
DTC P227118 or P227318 is output	A
DTC P227118 or P227318 and other DTCs are output	B

Tech Tips

If any DTCs other than P227118 or P227318 are output, troubleshoot those DTCs first.

GO TO DTC CHART Click here

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

Has the vehicle run out of fuel in the past?

Result

Proceed to
YES
NO

CLEAR DTC Click here

YES

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P227118 OR P227318)

Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P227118 or P227318.

Tester Display
All Readiness

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P227118 or P227318 is output)

DTC CAUSED BY RUNNING OUT OF FUEL

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

READ VALUE USING GTS (A/F (O2) SENSOR CURRENT)

Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine / Data List / A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2.

Powertrain > Engine > Data List

Tester Display
A/F (O2) Sensor Current B1S2
A/F (O2) Sensor Current B2S2

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.

Tech Tips

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.

Result

Test Value	Proceed to
Within normal range (7.5 mA or higher)	A
Outside normal range (Less than 7.5 mA)	B

REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) Click here

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
Idle the engine for 5 minutes or more with park (P) selected.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Current B1S1 and A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S1 and A/F (O2) Sensor Current B2S2.

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 B2S1
A/F (O2) Sensor Current B1S2
A/F (O2) Sensor Current B2S2

Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

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 or A/F (O2) Sensor Current B2S1 and A/F (O2) Sensor Current B2S2) displayed on the GTS.

Tech Tips

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.

Standard
GTS Display (Sensor)	Injection Volume	Status	Value
A/F (O2) Sensor Current B1S1 A/F (O2) Sensor Current B2S1 (Air fuel ratio sensor (sensor 1))	12.5%	Rich	Below -0.075 mA
	-12.5%	Lean	Higher than 0.037 mA
A/F (O2) Sensor Current B1S2 A/F (O2) Sensor Current B2S2 (Air fuel ratio sensor (sensor 2))	12.5%	Rich	Below -0.86 mA
	-12.5%	Lean	Higher than 0.33 mA

Result

Status of A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1	Status of A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2	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	A
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 voltages (A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1) is consistently higher than 0.037 mA, and the air fuel ratio sensor (sensor 2) output currents (A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2) is consistently higher than 0.33 mA.
Rich: During the Control the Injection Volume for A/F Sensor Active Test, the A/F (O2) Sensor Current B1S1 or A/F (O2) Sensor Current B2S1 is consistently below -0.075 mA, and the A/F (O2) Sensor Current B1S2 or A/F (O2) Sensor Current B2S2 is consistently below -0.86 mA.
Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output value of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.

Tech Tips

Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1, A/F (O2) Sensor Current B2S1, A/F (O2) Sensor Current B1S2 and A/F (O2) Sensor Current B2S2].

Click here

GO TO STEP 17 Click here

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Click here

OK
No leaks in the intake system.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE INTAKE SYSTEM

CHECK FOR EXHAUST GAS LEAK

Check for exhaust gas leaks.

OK
No gas leaks.

Tech Tips

Perform "Inspection After Repair" after repairing or replacing the exhaust system.

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE EXHAUST SYSTEM

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

Check the fuel pressure (for low pressure side).

Click here

Result

Proceed to
OK
NG

CHECK FUEL LINE Click here

INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

Inspect the fuel injector assembly (for port injection) (whether fuel volume is high or low, and whether injection pattern is poor).

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click here

Result

Proceed to
OK
NG

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Click here

READ VALUE USING GTS (FUEL PRESSURE (HIGH))

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine.
Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (High).

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (High)

Read the values.

Standard
3000 rpm (engine warmed up, park (P) selected, A/C off)
240 to 19500 kPag

Result

Proceed to
OK
NG

REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

INSPECT FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)

Inspect the fuel injector assembly (for direct injection).

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click here

Result

Proceed to
OK
NG

REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Click here

REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

Replace the air fuel ratio sensor (sensor 2).

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

Click here

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P227118 OR P227318)

Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P227118 or P227318.

Check the DTC judgment result.

Result

Proceed to

ABNORMAL

(DTC P227118 or P227318 is output)

NORMAL

(DTCs are not output)

REPLACE ECM Click here

END

REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

Replace the air fuel ratio sensor (sensor 2).

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

Click here

Result

Proceed to
NEXT

CLEAR DTC

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

Turn the engine switch off and wait for at least 30 seconds.

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P227118 OR P227318)

Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input the DTC: P227118 or P227318.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P227118 or P227318 is output)

END

REPLACE ECM Click here

CHECK FUEL LINE

Check the fuel lines for leaks or blockage.

Result

Proceed to
OK
NG

GO TO FUEL PUMP CONTROL CIRCUIT Click here

REPAIR OR REPLACE FUEL SYSTEM