Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HT6D
Model Year Start: 2020 Model: Corolla Prod Date Range: [03/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P2237-P2239,P2252,P2253; Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1); 2020 - 2023 MY Corolla [03/2019 - 11/2022]

DTC

P2237

Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1)

DTC

P2238

Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

DTC

P2239

Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1)

DTC

P2252

Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

DTC

P2253

Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1)

DESCRIPTION

Refer to DTC P0031.

Click here 2020 - 2023 MY Corolla [03/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0031,P0032,P101D; Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)+

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P2237

Oxygen (A/F) Sensor Pumping Current Circuit / Open (for A/F sensor) (Bank 1 Sensor 1)

An open in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor while the engine is running (2 trip detection logic).
  • Open in air fuel ratio sensor circuit
  • Air fuel ratio sensor
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

P2238

Oxygen Sensor Pumping Current Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

Case 1

  • Condition (a) or (b) continues for 5.0 seconds or more (2 trip detection logic):
    1. Voltage at terminal A1A+ is 0.5 V or less
    2. Voltage difference between terminals A1A+ and A1A- is 0.1 V or less

Case 2 (except Mexico models)

  • Air fuel ratio sensor admittance is less than 0.0054 1/Ω (2 trip detection logic).
  • Open or short in air fuel ratio sensor circuit
  • Air fuel ratio sensor
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

P2239

Oxygen Sensor Pumping Current Circuit High (for A/F sensor) (Bank 1 Sensor 1)

Case 1

  • The A1A+ voltage is higher than 4.5 V (2 trip detection logic).

Case 2

  • Voltage difference between terminals A1A+ and A1A- is higher than 0.8 V (2 trip detection logic).
  • Open or short in air fuel ratio sensor circuit
  • Air fuel ratio sensor
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

P2252

Oxygen Sensor Reference Ground Circuit Low (for A/F sensor) (Bank 1 Sensor 1)

The A1A- voltage is 0.5 V or less (2 trip detection logic).
  • Open or short in air fuel ratio sensor circuit
  • Air fuel ratio sensor
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

P2253

Oxygen Sensor Reference Ground Circuit High (for A/F sensor) (Bank 1 Sensor 1)

The A1A- voltage is higher than 4.5 V (2 trip detection logic).
  • Open or short in air fuel ratio sensor circuit
  • Air fuel ratio sensor
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

MONITOR DESCRIPTION

These DTCs are output when there is an open or short in the air fuel ratio sensor circuit, or if the air fuel ratio sensor output drops. To detect these problems, the voltage of the air fuel ratio sensor is monitored when turning the ignition switch to ON, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the air fuel ratio sensor is between 0.5 V and 4.5 V, it is considered normal. If the voltage is out of the specified range, or the admittance is less than the standard value, the ECM determines that there is a malfunction in the air fuel ratio sensor. If the same malfunction is detected in the next driving cycle, the ECM will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P2237: Air fuel ratio sensor open circuit between A1A+ and A1A-

P2238: Air fuel ratio sensor short circuit between A1A+ and A1A-

P2238: Air fuel ratio sensor short circuit between A1A+ and GND

P2238: Air fuel ratio sensor low admittance

P2239: Air fuel ratio sensor short circuit between A1A+ and +B

P2239: Air fuel ratio sensor short circuit between A1A+ and +B, and A1A- and GND

P2252: Air fuel ratio sensor short circuit between A1A- and GND

P2253: Air fuel ratio sensor short circuit between A1A- and +B

Required Sensors/Components (Main)

Air fuel ratio sensor

Required Sensors/Components (Related)

Engine coolant temperature sensor

Crank position sensor

Frequency of Operation

Continuous

Duration

10 seconds: P2237, P2238 (air fuel ratio sensor low admittance)

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

P0016 (VVT system - misalignment)

P0017 (Exhaust VVT system - misalignment)

P0031, P0032 (Air fuel ratio sensor heater)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0112, P0113 (Intake air temperature sensor)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0128 (Thermostat)

P0171, P0172 (Fuel system)

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

P0335 (Crank position sensor)

P0340 (Cam position sensor)

P0451, P0452, P0453 (EVAP system)

P0500 (Vehicle speed sensor)

P0505 (Idle speed control)

P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)

P2239, P2252 and P2253

Monitor runs whenever the following DTCs are not stored

None

P2237: Air Fuel Ratio Sensor Open Circuit Between A1A+ and A1A-

Estimated sensor temperature

450 to 550°C (842 to 1022°F)

Engine

Running

Battery voltage

11 V or higher

Ignition switch

ON

Time after ignition switch is off to ON

5 seconds or more

P2238: Low Admittance (except Mexico Models)

Estimated sensor temperature

700 to 800°C (1292 to 1472°F)

Engine coolant temperature

5°C (41°F) or higher (varies with engine coolant temperature at engine start)

Fuel cut

Not executed

Others

Battery voltage

11 V or higher

Ignition switch

ON

Time after ignition switch is off to ON

5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P2237: Open Circuit Between A1A+ and A1A-

Air fuel ratio sensor admittance

Less than 0.0018 1/Ω

P2238: Low Admittance (except Mexico Models)

Air fuel ratio sensor admittance

Less than 0.0054 1/Ω

P2238: Short Circuit Between A1A+ and GND

A1A+ terminal voltage

0.5 V or less

P2238: Short Circuit Between A1A+ and A1A-

Difference between A1A+ and A1A- terminal voltage

0.1 V or less

P2239: Short Circuit Between A1A+ and +B

A1A+ terminal voltage

Higher than 4.5 V

P2239: Air Fuel Ratio Sensor Short Circuit between A1A+ and +B, and A1A- and GND

Difference between A1A+ and A1A- terminal voltage

Higher than 0.8 V

P2252: Short Circuit Between A1A- and GND

A1A- terminal voltage

0.5 V or less

P2253: Short Circuit Between A1A- and +B

A1A- terminal voltage

Higher than 4.5 V

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn the Techstream on.
  8. Start the engine and wait 5 minutes.
  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  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 and ECT / Utility / All Readiness.
  12. Input the DTC: P2237, P2238, P2239, P2252 or P2253.
  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

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, idle the engine for 5 minutes and check the DTC judgment result again.
  14. If no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0031.

Click here 2020 - 2023 MY Corolla [03/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0031,P0032,P101D; Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)+

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

  • Refer to "Data List / Active Test" [AFS Voltage B1S1].

    Click here 2020 MY Corolla [03/2019 - 04/2020]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST 2021 - 2023 MY Corolla [04/2020 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST

  • 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 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 VOLTAGE)

*a

Front view of wire harness connector

(to Air Fuel Ratio Sensor)

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 connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C55-3 (A1A+) - Body ground

Ignition switch ON

3.2 to 3.4 V

C55-4 (A1A-) - Body ground

Ignition switch ON

2.8 to 3.0 V

C55-3 (A1A+) - C55-4 (A1A-)

Ignition switch ON

0.2 to 0.6 V

HINT:

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

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE AIR FUEL RATIO SENSOR

NG

2.

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

(a) Disconnect the air fuel ratio sensor 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

C55-1 (HA1A) - C77-27 (HA1A)

Always

Below 1 Ω

C55-3 (A1A+) - C77-100 (A1A+)

Always

Below 1 Ω

C55-4 (A1A-) - C77-132 (A1A-)

Always

Below 1 Ω

C55-1 (HA1A) or C77-27 (HA1A) - Body ground and other terminals

Always

10 kΩ or higher

C55-3 (A1A+) or C77-100 (A1A+) - Body ground and other terminals

Always

10 kΩ or higher

C55-4 (A1A-) or C77-132 (A1A-) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR