Toyota Avalon (XX50): A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground (P223711,...,P225412)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Engine / 2gr-fks Engine Control / Sfi System / A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground (P223711,...,P225412)

DESCRIPTION

Refer to DTC P219519.

Click here

HINT:

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

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 0.5 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 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 4.5 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2239
P223714	A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground or Open	An open or ground short in the circuit between terminals A1A+ and A1A- of the air fuel ratio sensor while the engine is running (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 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 0.1 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 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 0.8 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 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 admittance is less than 0.0054 1/Ω (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2238
P224011	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Short to Ground	The A2A+ voltage is 0.5 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2241
P224012	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Short to Battery	The A2A+ voltage is higher than 4.5 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2242
P224013	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Open	An open or ground short in the circuit between terminals A2A+ and A2A- of the air fuel ratio sensor while the engine is running (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2240
P224016	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Voltage Below Threshold	Difference between terminals A2A+ and A2A- is 0.1 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2241
P224017	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Voltage Above Threshold	Difference between terminals A2A+ and A2A- is higher than 0.8 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2242
P22401A	A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Resistance Below Threshold	The air fuel ratio sensor admittance is less than 0.0054 1/Ω (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2241
P225111	O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground	The A1A- voltage is 0.5 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 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 4.5 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 1 sensor 1) circuit Air fuel ratio sensor (bank 1 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2253
P225411	O2 Sensor Negative Current Control Bank 2 Sensor 1 Circuit Short to Ground	The A2A- voltage is 0.5 V or less for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2255
P225412	O2 Sensor Negative Current Control Bank 2 Sensor 1 Circuit Short to Battery	The A2A- voltage is higher than 4.5 V for 5 seconds or more (2 trip detection logic).	Open or short in air fuel ratio sensor (bank 2 sensor 1) circuit Air fuel ratio sensor (bank 2 sensor 1) ECM	Comes on	DTC stored	SAE Code: P2256

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 engine switch on (IG), 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 (bank 1) open circuit between A1A+ and A1A- P2238: Air fuel ratio sensor (bank 1) low admittance P2238: Air fuel ratio sensor (bank 1) short circuit between A1A+ and GND P2238: Air fuel ratio sensor (bank 1) short circuit between A1A+ and A1A- P2239: Air fuel ratio sensor (bank 1) short circuit between A1A+ and +B P2239: Air fuel ratio sensor (bank 1) short circuit between A1A+ and A1A- P2240: Air fuel ratio sensor (bank 2) open circuit between A2A+ and A2A- P2241: Air fuel ratio sensor (bank 2) low admittance P2241: Air fuel ratio sensor (bank 2) short circuit between A2A+ and GND P2241: Air fuel ratio sensor (bank 2) short circuit between A2A+ and A2A- P2242: Air fuel ratio sensor (bank 2) short circuit between A2A+ and +B P2242: Air fuel ratio sensor (bank 2) short circuit between A2A+ and A2A- P2252: Air fuel ratio sensor (bank 1) short circuit between A1A- and GND P2253: Air fuel ratio sensor (bank 1) short circuit between A1A- and +B P2255: Air fuel ratio sensor (bank 2) short circuit between A2A- and GND P2256: Air fuel ratio sensor (bank 2) short circuit between A2A- and +B
Required Sensors/Components (Main)	Air fuel ratio sensor
Required Sensors/Components (Related)	Engine coolant temperature sensor Crankshaft position sensor
Frequency of Operation	Continuous
Duration	10 seconds: P2237 and P2240 10 seconds: P2238 and P2241 (air fuel ratio sensor low admittance) 5 seconds: Others
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

P2237, P2238, P2240 and P2241

Monitor runs whenever the following DTCs are not stored

P0010, P0020 (VVT oil control solenoid bank 1, 2)

P0011, P0021 (VVT system bank 1, 2 - advance)

P0012, P0022 (VVT system bank 1, 2 - retard)

P0013, P0023 (Exhaust VVT oil control solenoid bank 1, 2)

P0014, P0024 (Exhaust VVT system bank 1, 2 - advance)

P0015, P0025 (Exhaust VVT system bank 1, 2 - retard)

P0016, P0018 (VVT system bank 1, 2 - misalignment)

P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P0037, P0038, P0057, P0058, P0141, P0161, P102D, P105D (Heated oxygen sensor heater)

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

P0101, P0102, P0103 (Mass air flow meter)

P0111, P0112, P0113 (Intake air temperature sensor)

P0116, P0117, P0118 (Engine coolant temperature sensor)

P011B (Engine coolant temperature/intake air temperature sensor correlation)

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

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0128 (Thermostat)

P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158, P0159, P0607 (Heated oxygen sensor)

P0171, P0172, P0174, P0175 (Fuel system)

P0201, P0202, P0203, P0204, P0205, P0206, P062D, P21CF, P21D0, P21D1, P21D2, P21D3, P21D4 (Fuel injector)

P0300 - P0306 (Misfire)

P0327, P0328, P0332, P0333 (Knock control sensor)

P0335, P0337, P0338 (Crankshaft position sensor)

P0340, P0342, P0343, P0345, P0347, P0348 (Camshaft position sensor)

P0351 - P0356 (Igniter)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust camshaft position sensor)

P0441, P00FE (EVAP system)

P0500 (Vehicle speed sensor)

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

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

P11EA, P11EB, P11EC, P11ED, P11EE, P11EF, P11F0, P11F1, P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air-fuel ratio imbalance)

P1235 (High pressure fuel pump circuit)

P2239, P2242, P2252, P2253, P2255 and P2256

Monitor runs whenever the following DTCs are not stored

None

P2237 and P2240: Open Circuit Between A1A+ and A1A- / A2A+ and A2A-

Engine	Running
Battery voltage	11 V or higher
Engine switch	On (IG)
Time after engine switch is off to on (IG)	5 seconds or more

P2238 and P2241: Low Admittance

Engine coolant temperature	5°C (41°F) or higher (varies with engine speed)
Fuel cut	Not executed

Others

Battery voltage	10.5 V or higher
Engine switch	On (IG)
Time after engine switch is off to on (IG)	5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P2237 and P2240: Open Circuit Between A1A+ and A1A- / A2A+ and A2A-

Air fuel ratio sensor admittance

Less than 0.0018 1/Ω

P2238 and P2241: Low Admittance

Air fuel ratio sensor admittance

Less than 0.0053 1/Ω

P2238 and P2241: Short Circuit Between A1A+ and GND / A2A+ and GND

A1A+ / A2A+ terminal voltage

0.5 V or less

P2238 and P2241: Short Circuit Between A1A+ and A1A- / A2A+ and A2A-

Difference between A1A+ and A1A- / A2A+ and A2A- terminal voltage

0.1 V or less

P2239 and P2242: Short Circuit Between A1A+ and +B / A2A+ and +B

A1A+ / A2A+ terminal voltage

Higher than 4.5 V

P2239 and P2242: Short Circuit Between A1A+ and A1A- / A2A+ and A2A-

Difference between A1A+ and A1A- / A2A+ and A2A- terminal voltage

Higher than 0.8 V

P2252 and P2255: Short Circuit Between A1A- and GND / A2A- and GND

A1A- / A2A- terminal voltage

0.5 V or less

P2253 and P2256: Short Circuit Between A1A- and +B / A2A- and +B

A1A- / A2A- terminal voltage

Higher than 4.5 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
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream 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.
Start the engine and wait 5 minutes or more [A].
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Trouble Codes [B].
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: P223711, P223712, P223713, P223716, P223717, P22371B, P224011, P224012, P224013, P224016, P224017, P22401B, P225111, P225112, P225411 or P225412.

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 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 P219519.

Click here

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
Bank 2 refers to the bank that does not include the No. 1 cylinder.
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 Voltage B1S1].
Click here
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)

Front view of wire harness connector

(to Air Fuel Ratio Sensor)

Bank 1

Bank 2

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 engine switch on (IG).

Standard Voltage:

Tester Connection	Condition	Specified Condition
C47-3 (A1A+) - Body ground	Engine switch on (IG)	3.2 to 3.4 V
C47-4 (A1A-) - Body ground	Engine switch on (IG)	2.8 to 3.0 V
C47-3 (A1A+) - C47-4 (A1A-)	Engine switch on (IG)	0.2 to 0.6 V
C48-3 (A2A+) - Body ground	Engine switch on (IG)	3.2 to 3.4 V
C48-4 (A2A-) - Body ground	Engine switch on (IG)	2.8 to 3.0 V
C48-3 (A2A+) - C48-4 (A2A-)	Engine switch on (IG)	0.2 to 0.6 V

HINT:

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

Click here

REPLACE AIR FUEL RATIO SENSOR

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

(a) Disconnect the air fuel ratio sensor connector.

(b) Disconnect the ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C47-1 (HA1A) - C56-52 (HA1A)	Always	Below 1 Ω
C47-3 (A1A+) - C56-125 (A1A+)	Always	Below 1 Ω
C47-4 (A1A-) - C56-126 (A1A-)	Always	Below 1 Ω
C48-1 (HA2A) - C56-17 (HA2A)	Always	Below 1 Ω
C48-3 (A2A+) - C56-123 (A2A+)	Always	Below 1 Ω
C48-4 (A2A-) - C56-124 (A2A-)	Always	Below 1 Ω
C47-1 (HA1A) or C56-52 (HA1A) - Body ground and other terminals	Always	10 kΩ or higher
C47-3 (A1A+) or C56-125 (A1A+) - Body ground and other terminals	Always	10 kΩ or higher
C47-4 (A1A-) or C56-126 (A1A-) - Body ground and other terminals	Always	10 kΩ or higher
C48-1 (HA2A) or C56-17 (HA2A) - Body ground and other terminals	Always	10 kΩ or higher
C48-3 (A2A+) or C56-123 (A2A+) - Body ground and other terminals	Always	10 kΩ or higher
C48-4 (A2A-) or C56-124 (A2A-) - Body ground and other terminals	Always	10 kΩ or higher

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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