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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 169 (Engine Control System - Diagnostic Codes (9 Of 9) & Symptom Tests (1 Of 3)) >> SFI System >> DTC P2BF4-12: Exhaust Flow Control Valve "A" Position Circuit High Circuit Short to Battery [09/2022 - 09/2024] >> Procedure

DTC P2BF4-12: Exhaust Flow Control Valve "A" Position Circuit High Circuit Short to Battery [09/2022 - 09/2024]: Procedure

WARNING: This page is about a different car, the 2025 Toyota GR Corolla, 2024 Toyota GR Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TERMINAL VOLTAGE (EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY) 
    GTY1103652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Exhaust Pipe Gas Control Actuator Sub-assembly)

    HINT: 

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

    1. Disconnect the exhaust pipe gas control actuator sub-assembly connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      O173-1 (RHVC) - Body ground Ignition switch ON Below 1 V

      HINT: 

      If the value differs from standard, there may be a short in the power source circuit.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY- BODY GROUND) 
    1. Disconnect the exhaust pipe gas control actuator sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O173-2 (RHE2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY - ECM) 
    1. Disconnect the exhaust pipe gas control actuator sub-assembly 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
      O173-2 (RHE2) - C143-22 (EEXA) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (EXHAUST PIPE GAS CONTROL ACTUATOR SUB-ASSEMBLY - ECM) 
    1. Disconnect the exhaust pipe gas control actuator sub-assembly 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
      O173-1 (RHVC) or C143-32 (VCEA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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