Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001JWJM
Model Year Start: 2020 Model: Avalon HV Prod Date Range: [08/2019 -           ]
Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P223711,P223712,P223713,P223716,P223717,P22371B,P225111,P225112; A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground; 2020 - 2022 MY Avalon HV [08/2019 -        ]

DTC

P223711

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground

DTC

P223712

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Battery

DTC

P223713

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Open

DTC

P223716

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Below Threshold

DTC

P223717

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Above Threshold

DTC

P22371B

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Resistance Above Threshold

DTC

P225111

O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground

DTC

P225112

O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Battery

DESCRIPTION

Refer to DTC P003012.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P003012,P003013,P101A9E; HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery+

HINT:

Although the DTC titles say O2 sensor, these DTCs relate to the air fuel ratio sensor (sensor 1).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P223711

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground

The A1A+ voltage is 1.26 V or less for 5 seconds or more (2 trip detection logic).

  • Short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2238

P223712

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Battery

The A1A+ voltage is higher than 4.47 V for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2239

P223713

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Open

An open or ground short in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor (sensor 1) while the engine is running (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2237

P223716

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Below Threshold

Difference between terminals A1A+ and A1A- is 0.2 V or less for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2238

P223717

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Above Threshold

Difference between terminals A1A+ and A1A- is higher than 1.04 V for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2239

P22371B

A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Resistance Above Threshold

The air fuel ratio sensor (sensor 1) impedance is higher than 185 Ω (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2238

P225111

O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground

The A1A- voltage is 1.07 V or less for 5 seconds or more (2 trip detection logic).

  • Short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2252

P225112

O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Battery

The A1A- voltage is higher than 3.93 V for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 1) circuit
  • Air fuel ratio sensor (sensor 1)
  • ECM

Comes on

DTC stored

SAE Code: P2253

MONITOR DESCRIPTION

These DTCs are stored when there is an open or short in the air fuel ratio sensor (sensor 1) circuit, or the air fuel ratio sensor (sensor 1) output value is abnormal. The voltage of the air fuel ratio sensor (sensor 1) is monitored while the power switch is on (IG), and the impedance (impedance is an electrical term that indicates the difficulty of flow of current) is checked while engine running. If the voltage of the air fuel ratio sensor (sensor 1) is outside the normal range, or the impedance is outside the normal range, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P2237: Air fuel ratio sensor (sensor 1) circuit continuity check (circuit open)

P2238: Air fuel ratio sensor (sensor 1) impedance check (high impedance)

P2238: Air fuel ratio sensor (sensor 1) range check (A1A+ low voltage)

P2238: Air fuel ratio sensor (sensor 1) correlation (A1A+ and A1A-)

P2239: Air fuel ratio sensor (sensor 1) range check (A1A+ high voltage)

P2239: Air fuel ratio sensor (sensor 1) correlation (A1A+ and A1A-)

P2252: Air fuel ratio sensor (sensor 1) range check (A1A- low voltage)

P2253: Air fuel ratio sensor (sensor 1) range check (A1A- high voltage)

Required Sensors/Components (Main)

Air fuel ratio sensor (sensor 1)

Required Sensors/Components (Related)

Engine coolant temperature sensor

Crankshaft position sensor

Frequency of Operation

Continuous

Duration

10 seconds: P2237, P2238 (air fuel ratio sensor (sensor 1) high impedance)

5 seconds: Others

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P2237 and P2238

Monitor runs whenever the following DTCs are not stored

P0010, P1360, P1362, P1364, P1366, P2614 (Motor drive VVT system control module)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0013 (Exhaust VVT oil control solenoid)

P0014 (Exhaust VVT system - advance)

P0015 (Exhaust VVT system - retard)

P0016 (VVT system - misalignment)

P0017 (Exhaust VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor (sensor 1) heater)

P0037, P0038, P102D (Air fuel ratio sensor (sensor 2) heater)

P0087, P0088, P0191, P0192, P0193 (Fuel pressure sensor (for high pressure side))

P0101, P0102, P0103 (Mass air flow meter)

P0106, P0107, P0108 (Manifold absolute pressure)

P0111, P0112, P0113 (Intake air temperature sensor)

P0116, P0117, P0118 (Engine coolant temperature sensor)

P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0128 (Thermostat)

P0136, P013A, P2270, P2271, P22AB, P22AC, P22AD, P22B3, P22B4 (Air fuel ratio sensor (sensor 2))

P0171, P0172 (Fuel system)

P0201, P0202, P0203, P0204, P062D, P21CF, P21D0, P21D1, P21D2 (Fuel injector)

P0300, P0301, P0302, P0303, P0304 (Misfire)

P0327, P0328 (Knock control sensor)

P0335, P0337, P0338 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0365, P0367, P0368 (Exhaust camshaft position sensor)

P0401 (EGR system (closed))

P0441 (EVAP system)

P0489, P0490 (EGR control circuit)

P0657, P0658, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)

P107B, P107C, P107D (Fuel pressure sensor (for low pressure side))

P11EA, P11EC, P11ED, P11EE, P11EF, P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)

P1235 (High pressure fuel pump circuit)

P2228, P2229 (Atmospheric pressure sensor)

P2239, P2252 and P2253

Monitor runs whenever the following DTCs are not stored

None

P2237: Air Fuel Ratio Sensor (Sensor 1) Circuit Continuity Check (Circuit Open)

Engine

Running

Auxiliary battery voltage

11 V or higher

Power switch

On (IG)

Time after power switch is off to on (IG)

5 seconds or more

P2238: Air Fuel Ratio Sensor (Sensor 1) Impedance Check (High Impedance)

Fuel cut

Not executed

P2238 and P2239: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A+ Low Voltage, A1A+ High Voltage)

Auxiliary battery voltage

10.5 V or higher

Power switch

On (IG)

Time after power switch is off to on (IG)

0.5 seconds or more

Air fuel ratio sensor (sensor 1) circuit fail (P2237)

Not detected

Air fuel ratio sensor (sensor 1) positive/negative current control circuit correlation fail (P2238, P2239)

Not detected

Air fuel ratio sensor (sensor 1) negative current control circuit range check fail (P2252, P2253)

Not detected

P2238 and P2239: Air Fuel Ratio Sensor (Sensor 1) Correlation (A1A+ and A1A-)

Auxiliary battery voltage

10.5 V or higher

Power switch

On (IG)

Time after power switch is off to on (IG)

0.5 seconds or more

Air fuel ratio sensor (sensor 1) circuit fail (P2237)

Not detected

Air fuel ratio sensor (sensor 1) positive current control circuit range check fail (P2238, P2239)

Not detected

Air fuel ratio sensor (sensor 1) negative current control circuit range check fail (P2252, P2253)

Not detected

P2252 and P2253: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A- Low Voltage, A1A- High Voltage)

Auxiliary battery voltage

10.5 V or higher

Power switch

On (IG)

Time after power switch is off to on (IG)

0.5 seconds or more

Air fuel ratio sensor (sensor 1) circuit fail (P2237)

Not detected

Air fuel ratio sensor (sensor 1) positive/negative current control circuit correlation fail (P2238, P2239)

Not detected

Air fuel ratio sensor (sensor 1) positive current control circuit range check fail (P2238, P2239)

Not detected

TYPICAL MALFUNCTION THRESHOLDS

P2237: Air Fuel Ratio Sensor (Sensor 1) Circuit Continuity Check (Circuit Open)

Air fuel ratio sensor (sensor 1) impedance

Higher than 556 Ω

P2238: Air Fuel Ratio Sensor (Sensor 1) Impedance Check (High Impedance)

Air fuel ratio sensor (sensor 1) impedance

Higher than 185 Ω

P2238: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A+ Low Voltage)

A1A+ terminal voltage

1.26 V or less

P2238: Air Fuel Ratio Sensor (Sensor 1) Correlation (A1A+ and A1A-)

Difference between A1A+ terminal and A1A- terminal voltage

0.2 V or less

P2239: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A+ High Voltage)

A1A+ terminal voltage

Higher than 4.47 V

P2239: Air Fuel Ratio Sensor (Sensor 1) Correlation (A1A+ and A1A-)

Difference between A1A+ terminal and A1A- terminal voltage

Higher than 1.04 V

P2252: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A- Low Voltage)

A1A- terminal voltage

1.07 V or less

P2253: Air Fuel Ratio Sensor (Sensor 1) Range Check (A1A- High Voltage)

A1A- terminal voltage

Higher than 3.93 V

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off and wait for at least 30 seconds.
  6. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  7. Start the engine and wait 5 minutes or more [A].
  8. Turn the Techstream on.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P223711, P223712, P223713, P223716, P223717, P22371B, P225111 or P225112.
  13. Check the DTC judgment result.

    Techstream 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 has a malfunction.
    • If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.
    • [A] to [B]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

Refer to DTC P003012.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P003012,P003013,P101A9E; HO2S Heater Control Bank 1 Sensor 1 Circuit Short to Battery+

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): VEHICLE CONTROL HISTORY

HINT:

  • Sensor 1 refers to the sensor closest to the engine assembly.
  • Sensor 2 refers to the sensor farthest away from the engine assembly.
  • Refer to "Data List / Active Test" [A/F (O2) Sensor Current B1S1].

    Click here 2020 MY Avalon HV [08/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST

  • 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.

PROCEDURE

1.

CHECK TERMINAL VOLTAGE (AIR FUEL RATIO SENSOR (SENSOR 1) VOLTAGE)

*a

Front view of wire harness connector

(to Air Fuel Ratio Sensor (Sensor 1))

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the air fuel ratio sensor (sensor 1) connector.

(b) Turn the power switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C46-3 (A1A+) - Body ground

Power switch on (IG)

2.8 to 3.0 V

C46-4 (A1A-) - Body ground

Power switch on (IG)

2.3 to 2.7 V

C46-3 (A1A+) - C46-4 (A1A-)

Power switch on (IG)

0.1 to 0.7 V

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click here 2020 - 2021 MY Avalon HV [08/2019 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)

NG

2.

CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR (SENSOR 1) - ECM)

(a) Disconnect the air fuel ratio sensor (sensor 1) connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C46-1 (HA1A) - C55-9 (HA1A)

Always

Below 1 Ω

C46-3 (A1A+) - C55-95 (A1A+)

Always

Below 1 Ω

C46-4 (A1A-) - C55-94 (A1A-)

Always

Below 1 Ω

C46-1 (HA1A) or C55-9 (HA1A) - Body ground and other terminals

Always

10 kΩ or higher

C46-3 (A1A+) or C55-95 (A1A+) - Body ground and other terminals

Always

10 kΩ or higher

C46-4 (A1A-) or C55-94 (A1A-) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR