2ZR-FXE (ENGINE CONTROL): SFI SYSTEM: P22AB12,P22AB14,P22AB1A,P22B211,P22B212; A/F (O2) Sensor Positive Current Control Bank 1 Sensor 2 Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022

Although the DTC titles say O2 sensor, these DTCs relate to the heated oxygen sensor.

MONITOR DESCRIPTION

These DTCs are stored when there is an open or short in the heated oxygen sensor circuit, or the heated oxygen sensor output value is abnormal. The voltage of the heated oxygen sensor is monitored while the ignition switch is ON, 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 heated oxygen sensor is outside the normal range, or the impedance is outside the normal range, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

P22AC: Oxygen Sensor (Sensor 2) Circuit Open

P22AC: Oxygen Sensor (Sensor 2) Range Check (OX1B Low Voltage)

P22AD: Oxygen Sensor(Sensor 2) Range Check Range Check (OX1B High Voltage)

P22B3 and P22B4: Oxygen Sensor (Sensor 2) Range Check (E2 Low Voltage, E2 High Voltage)

TYPICAL MALFUNCTION THRESHOLDS

P22AC: Oxygen Sensor(Sensor 2) Range Check (OX1B Low Voltage)

P22AC: Oxygen Sensor(Sensor 2) Circuit Open

P22AD: Oxygen Sensor (Sensor 2) Range Check Range Check (OX1B High Voltage)

P22B3: Oxygen Sensor (Sensor 2) Range Check (E2 Low Voltage)

P22AD: Air Fuel Ratio Sensor (Sensor 2) Sensor Correlation (A1B+ and A1B-)

CONFIRMATION DRIVING PATTERN

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Click here
Start the engine and wait 5 minutes or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P22AB12, P22AB14, P22AB1A, P22B211 or P22B212.

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

HINT:

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, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

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 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

(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, 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.
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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 B1S2].
Click here
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

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