SFI SYSTEM(for Rear Air Fuel Ratio Sensor), Diagnostic DTC:P227019, P227118

DTC Code	DTC Name
P227019	A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold
P227118	A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold

DESCRIPTION

Tech Tips

DTC P227019 is applicable to w/ Canister Pump Module only.

Refer to DTC P003612.

Click here

Tech Tips

Although the DTC title say oxygen sensor, these DTCs relate to the air fuel ratio sensor (sensor 2).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P227019	A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold	While the fuel-cut operation is performed (during vehicle deceleration), the air fuel ratio sensor (sensor 2) current is 33.13 mA or more for 0.5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (sensor 2) circuit Air fuel ratio sensor (sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Port fuel injector assembly Direct fuel injector assembly Fuel system ECM	Comes on	DTC stored	SAE Code: P2270
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).	Open or short in air fuel ratio sensor (sensor 2) circuit Air fuel ratio sensor (sensor 2) Intake system Gas leak from exhaust system Fuel pressure (for high pressure side) Fuel pressure (for low pressure side) Port fuel injector assembly Direct fuel injector assembly Fuel system ECM	Comes on	DTC stored	SAE Code: P2271

Tech Tips

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 33.13 mA or more for 0.5 seconds or more of cumulative time, the ECM interprets this as a malfunction of the air fuel ratio sensor (sensor 2) and stores DTC P227019 (stuck on high side). 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
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

TYPICAL MALFUNCTION THRESHOLDS

P227019: Air Fuel Ratio Sensor (Sensor 2) Limit Current (High Side Malfunction)
Duration of following condition	0.5 seconds or more
Air fuel ratio sensor (sensor 2) current	33.13 mA or more

P227118: Air Fuel Ratio Sensor (Sensor 2) Limit Current (Low Side Malfunction)
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 the shift lever in P [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.
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.
With the shift lever in M, 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.
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.
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: P227019 or 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

Tech Tips

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 M, 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

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 DTC P227019 OR P227118)

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 P227019 or P227118 is output	A
DTC P227019 or P227118 and P00D562 are output
DTC P227019 or P227118 and P013A7C are output
DTC P227019 or P227118 and other DTCs are output	B

Tech Tips

If any DTCs other than P227019 or P227118 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 P227019 OR P227118)

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: P227019 or P227118.

Tester Display
All Readiness

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P227019 or P227118 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 (TEST VALUE OF AIR FUEL RATIO SENSOR (SENSOR 2))

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.

Powertrain > Engine > Data List

Tester Display

A/F (O2) Sensor Current B1S2

Tester Display
A/F (O2) Sensor Current B1S2

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 more, and less than 33.13 mA)	A
Outside normal range (Less than 7.5 mA, or 33.13 mA or more)	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.
Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / Coolant Temperature, A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
Coolant Temperature
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Current B1S2

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

Monitor the output values of the air fuel ratio sensors (A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2) 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 Voltage B1S1 (Air fuel ratio sensor (sensor 1))	12.5%	Rich	Below 3.1 V
	-12.5%	Lean	Higher than 3.4 V
A/F (O2) Sensor Current B1S2 (Air fuel ratio sensor (sensor 2))	12.5%	Rich	Below -0.86 mA
	-12.5%	Lean	More than 0.33 mA

Result

Status of A/F (O2) Sensor Voltage 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	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 voltage (A/F (O2) Sensor Voltage B1S1) is consistently higher than 3.4 V, 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 voltage (A/F (O2) Sensor Voltage B1S1) is consistently below 3.1 V, 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 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 Voltage B1S1, A/F (O2) Sensor Current B1S2].

Click here

GO TO STEP 18 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 in exhaust system.

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 PORT FUEL INJECTOR ASSEMBLY

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

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the port fuel injector assembly.

Click here

Result

Proceed to
OK
NG

REPLACE PORT FUEL INJECTOR ASSEMBLY Click here

READ VALUE USING GTS (FUEL PRESSURE (HIGH))

Connect the GTS to the DLC3.
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.
Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temperature, Fuel Pressure (High) and Injection Mode.

Powertrain > Engine > Data List

Tester Display
Engine Speed
Coolant Temperature
Fuel Pressure (High)
Injection Mode

According to the display on the GTS, read the Data List.

Standard

GTS Display	Condition	Specified Condition
Fuel Pressure (High)	Shift position: P A/C: Off Engine warmed up Engine Speed: 3000 rpm Injection Mode: Direct	4000 to 8000 kPag

Result

Proceed to
OK
NG

REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

INSPECT DIRECT FUEL INJECTOR ASSEMBLY

Inspect the direct fuel injector assembly.

Click here

Tech Tips

Perform "Inspection After Repair" after replacing the direct fuel injector assembly.

Click here

Result

Proceed to
OK
NG

REPLACE DIRECT FUEL INJECTOR ASSEMBLY 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 P227019 OR P227118)

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: P227019 or P227118.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P227019 or P227118 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 LINE

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 P227019 OR P227118)

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: P227019 or P227118.

Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

ABNORMAL

(DTC P227019 or P227118 is output)

END

REPLACE ECM Click here