DTC P2270-19: A/F (O2) Sensor Signal Biased/Stuck Lean Bank 1 Sensor 2 Circuit Current Above Threshold; DTC P2271-18: A/F (O2) Sensor Signal Biased/Stuck Rich Bank 1 Sensor 2 Circuit Current Below Threshold [11/2023 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P2270-19 or P2271-18 is output	A
   DTC P2270-19 or P2271-18 and P00D5-62 are output
   DTC P2270-19 or P2271-18 and P013A-7C are output
   DTC P2270-19 or P2271-18 and other DTCs are output	B

   HINT: 

   If any DTCs other than P2270-19 or P2271-18 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

Result: 

A 

See step  2

1. Has the vehicle run out of fuel in the past?

   Result

   Proceed to
   YES
   NO

Result: 

NO 

See step  5

Result: 

YES 

See step  3

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P2270-19 or P2271-18.

   Result

   Result	Proceed to
   NORMAL (DTCs are not output)	A
   ABNORMAL (DTC P2270-19 or P2271-18 is output)	B

Result: 

A 

DTC CAUSED BY RUNNING OUT OF FUEL 

Result: 

B 

See step  5

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Result	Proceed to
   NEXT (except Mexico Models)	A
   NEXT (for Mexico Models)	B

Result: 

B 

See step  7

Result: 

A 

See step  6

1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
2. Check that the status of O2 Sensor is Complete. If the status is still Incomplete, drive the vehicle according to the driving pattern again.

   Powertrain > Engine > Monitor 

3. Check the test value of the air fuel ratio sensor (sensor 2) output current during fuel-cut.

   Powertrain > Engine > Monitor 

   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

Result: 

A 

See step  8

Result: 

B 

See step  20

1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
2. 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.

   Powertrain > Engine > Data List 

   Tester Display
   A/F (O2) Sensor Current B1S2

   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 Techstream.

   Result

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

Result: 

B 

See step  20

Result: 

A 

See step  8

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

3. Idle the engine for 5 minutes or more with the shift lever in P.
4. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.

   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

5. 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.
   STANDARD
   
   

   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

   Result

   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

   1. 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.
   2. 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.
   3. 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, A/F (O2) Sensor Current B1S2].

   Refer to DATA LIST / ACTIVE TEST [11/2023 - 11/2024] , or refer to DATA LIST / ACTIVE TEST [11/2024 - ]

Result: 

B 

See step  20

Result: 

A 

See step  9

1. Check the intake system for vacuum leaks.

   Refer to ON-VEHICLE INSPECTION [12/2019 - ]

   OK

   No leaks in the intake system.

   HINT: 

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

   Refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE INTAKE SYSTEM 

Result: 

OK 

See step  10

1. Check for exhaust gas leaks.

   OK

   No gas leaks in exhaust system.

   HINT: 

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

   Refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE EXHAUST SYSTEM 

Result: 

OK 

See step  11

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

   HINT: 

   The A/C switch and all accessories should be off.

3. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the EGR Step Position

   Data List Display
   Intake Manifold Absolute Pressure
   Engine Independent

   NOTE:

   • Make sure that the value of Data List item Engine Independent is "Operate" while performing the Active Test.
   • 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.
   • Do not open the EGR valve 30 steps or more during the Active Test.

   OK

   The value of Intake Manifold Absolute Pressure changes in response to the EGR step position when the value of Engine Independent is "Operate".

   Standard

   -	EGR Step Position (Active Test)
   	0 Steps	0 to 30 Steps
   Intake Manifold Absolute Pressure (Data List)	(EGR valve is fully closed)	Intake Manifold Absolute Pressure value is at least +10 kPa (1.45 psi) higher than when EGR valve is fully closed

   HINT: 

   • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).
   • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.
   • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  13

Result: 

NG 

See step  12

1. Remove the EGR valve assembly.

   Refer to REMOVAL [11/2023 - ]

2. Check if the EGR valve is stuck open.

   OK

   EGR valve is tightly closed.

   HINT: 

   Perform "Inspection After Repair" after replacing the EGR valve assembly.

   Refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE EGR VALVE ASSEMBLY 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  13

Refer to PROCEDURE - Step 2

Result

Result: 

NG 

See step  23

Result: 

OK 

See step  14

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

   Refer to INSPECTION [12/2019 - ]

   HINT: 

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

   Refer to INITIALIZATION [10/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PORT FUEL INJECTOR ASSEMBLY 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  15

1. Put the engine in Inspection Mode (Maintenance Mode).

   Powertrain > Hybrid Control > Utility 

   Tester Display
   Inspection Mode

2. 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.

   Powertrain > Engine > Data List 

   Tester Display
   Coolant Temperature

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

   Powertrain > Engine > Data List 

   Tester Display
   Engine Speed
   Fuel Pressure (High)
   Injection Mode

   HINT: 

   During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.

   Standard

   GTS Display	Condition	Specified Condition
   Fuel Pressure (High)	Shift position: P A/C: Off Engine warmed up Engine Speed: 2500 rpm Injection Mode: Direct	3000 to 25000 kPa

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE) 

Result: 

OK 

See step  16

Refer to INSPECTION [12/2019 - ]

HINT: 

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

Refer to INITIALIZATION [10/2021 - ]

Result

Result: 

NG 

REPLACE DIRECT FUEL INJECTOR ASSEMBLY 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  17

Refer to REMOVAL [12/2019 - ]

HINT: 

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

Refer to INITIALIZATION [10/2021 - ]

Result

Result: 

NEXT 

See step  18

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  19

1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P2270-19 or P2271-18.

   Result

   Result	Proceed to
   NORMAL (DTCs are not output)	A
   ABNORMAL (DTC P2270-19 or P2271-18 is output)	B

Result: 

A 

END 

Result: 

B 

REPLACE ECM 

Refer to REMOVAL [11/2023 - ]

Refer to REMOVAL [12/2019 - ]

HINT: 

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

Refer to INITIALIZATION [10/2021 - ]

Result

Result: 

NEXT 

See step  21

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  22

1. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
2. Check the DTC judgment result.

   Powertrain > Engine > Utility 

   Tester Display
   All Readiness

3. Input the DTC: P2270-19 or P2271-18.

   Result

   Result	Proceed to
   NORMAL (DTCs are not output)	A
   ABNORMAL (DTC P2270-19 or P2271-18 is output)	B

Result: 

A 

END 

Result: 

B 

REPLACE ECM 

Refer to REMOVAL [11/2023 - ]

1. Check the fuel lines for leaks or blockage.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO FUEL PUMP CONTROL CIRCUIT 

Refer to Fuel Pump Control Circuit [10/2021 - 11/2024] , or refer to Fuel Pump Control Circuit [11/2024 - ]

Result: 

NG 

REPAIR OR REPLACE FUEL SYSTEM