2GR-FKS (ENGINE CONTROL): SFI SYSTEM: P223711,...,P225412; A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground; 2019 - 2020 MY Sienna [08/2018

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

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 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

TYPICAL ENABLING CONDITIONS

P2237, P2238, P2240 and P2241

P2239, P2242, P2252, P2253, P2255 and P2256

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

P2238 and P2241: Low Admittance

Others

TYPICAL MALFUNCTION THRESHOLDS

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

P2238 and P2241: Low Admittance

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

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

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

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

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

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

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.
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When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream 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 and turn the Techstream on.
Start the engine and wait 5 minutes or more [A].
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 shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows 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

CAUTION / NOTICE / HINT

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].
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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

(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(j) Input the DTC: P223711, P223712, P223713, P223716, P223717, P22371B, P224011, P224012, P224013, P224016, P224017, P22401B, P225111, P225112, P225411 or P225412.