SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P22AB, P22AC, P22AD, P22B3, P22B4

DTC Code DTC Name
P22AB O2 (A/F) Sensor Positive Current Control Circuit/Open Bank 1 Sensor 2
P22AC O2 (A/F) Sensor Positive Current Control Circuit Low Bank 1 Sensor 2
P22AD O2 (A/F) Sensor Positive Current Control Circuit High Bank 1 Sensor 2
P22B3 O2 (A/F) Sensor Negative Current Control Circuit Low Bank 1 Sensor 2
P22B4 O2 (A/F) Sensor Negative Current Control Circuit High Bank 1 Sensor 2

DESCRIPTION

Refer to DTC P0037.

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Tech Tips

Although the DTC title say O2 sensor, these DTCs relate to the air fuel ratio sensor (sensor 2).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P22AB O2 (A/F) Sensor Positive Current Control Circuit/Open Bank 1 Sensor 2 100 seconds or more elapse after the air fuel ratio sensor (sensor 2) heater turns on and the air fuel ratio sensor (sensor 2) impedance is higher than 510 Ω (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 2) circuit

  • Air fuel ratio sensor (sensor 2)

  • ECM

 Comes on DTC stored
P22AC O2 (A/F) Sensor Positive Current Control Circuit Low Bank 1 Sensor 2

  • Case 1

    The A1B+ voltage is 1.43 V or less for 5 seconds or more (2 trip detection logic).

  • Case 2

    When A1B- voltage is higher than 2.77 V, the difference between terminals A1B+ and A1B- is 0.2 V or less for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 2) circuit

  • Air fuel ratio sensor (sensor 2)

  • ECM

 Comes on DTC stored
P22AD O2 (A/F) Sensor Positive Current Control Circuit High Bank 1 Sensor 2

  • Case 1

    The A1B+ voltage is higher than 6.135 V for 5 seconds or more (2 trip detection logic).

  • Case 2

    Difference between terminals A1B+ and A1B- is higher than 1.72 V for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 2) circuit

  • Air fuel ratio sensor (sensor 2)

  • ECM

 Comes on DTC stored
P22B3 O2 (A/F) Sensor Negative Current Control Circuit Low Bank 1 Sensor 2 The A1B- voltage is 1.07 V or less for 5 seconds or more (2 trip detection logic).

  • Short in air fuel ratio sensor (sensor 2) circuit

  • Air fuel ratio sensor (sensor 2)

  • ECM

 Comes on DTC stored
P22B4 O2 (A/F) Sensor Negative Current Control Circuit High Bank 1 Sensor 2 The A1B- voltage is higher than 4.59 V for 5 seconds or more (2 trip detection logic).

  • Open or short in air fuel ratio sensor (sensor 2) circuit

  • Air fuel ratio sensor (sensor 2)

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

These DTCs are stored when there is an open or short in the air fuel ratio sensor (sensor 2) circuit, or the air fuel ratio sensor (sensor 2) output value is abnormal. The voltage of the air fuel ratio sensor (sensor 2) is monitored while the engine switch 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 2) is outside the normal range, or the impedance is outside the normal range, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components Air fuel ratio sensor (sensor 2)
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Start the engine and wait 5 minutes or more.

  6. Turn the GTS on.

  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  8. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  10. Input the DTC: P22AB, P22AC, P22AD, P22B3 or P22B4.

  11. 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • 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 or N/A, idle the engine for 5 minutes and check the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P0037.

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CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • 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" [AFS 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


  1. CHECK TERMINAL VOLTAGE (AIR FUEL RATIO SENSOR (SENSOR 2) VOLTAGE)

    B008J11C11
    *a

    Front view of wire harness connector

    (to Air Fuel Ratio Sensor (Sensor 2))

    Tech Tips

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


    1. Disconnect the air fuel ratio sensor (sensor 2) connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I191-4 (A1B+) - Body ground Engine switch on (IG) 2.8 to 3.2 V
      I191-3 (A1B-) - Body ground Engine switch on (IG) 2.3 to 2.7 V
      I191-4 (A1B+) - I191-3 (A1B-) Engine switch on (IG) 0.1 to 0.9 V

      Tech Tips

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR FUEL RATIO SENSOR (SENSOR 2) Click here

    NG

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


    1. Disconnect the air fuel ratio sensor (sensor 2) connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I191-2 (HA1B) - C65-56 (HA1B) Always Below 1 Ω
      I191-4 (A1B+) - C65-99 (A1B+) Always Below 1 Ω
      I191-3 (A1B-) - C65-131 (A1B-) Always Below 1 Ω
      I191-2 (HA1B) or C65-56 (HA1B) - Body ground and other terminals Always 10 kΩ or higher
      I191-4 (A1B+) or C65-99 (A1B+) - Body ground and other terminals Always 10 kΩ or higher
      I191-3 (A1B-) or C65-131 (A1B-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR