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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 P25B4-73: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Closed [09/2022 - 09/2024] >> Procedure

DTC P25B4-73: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Closed [09/2022 - 09/2024]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P25B4-73) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P25B4-73 is output A
      DTC P25B4-73 and other DTCs are output B

      HINT: 

      If any DTCs other than P25B4-73 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART 

    Result: 

    A 

    See step  2

  2. CHECK VACUUM REGULATING VALVE ASSEMBLY 
    GTY1107668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Waste Gate Valve Actuator with Bracket Assembly
    1. Disconnect the vacuum hose of the waste gate valve actuator with bracket assembly.
    2. Start the engine.
    3. Check whether the vacuum hose of the vacuum regulating valve assembly applies no suction your finger.

      OK

      Vacuum hose applies no suction to finger.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  3

  3. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Inspect the mass air flow meter sub-assembly, referring to On-vehicle Inspection for Mass Air Flow Meter.

      Refer to ON-VEHICLE INSPECTION [09/2022 - ]

    2. Inspect the mass air flow meter sub-assembly, referring to Inspection for Mass Air Flow Meter.

      Refer to INSPECTION [09/2022 - ]

    3. Inspect the operation of the mass air flow meter sub-assembly.
      1. Start the engine.
      2. Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.
      3. Read Mass Air Flow Sensor while maintaining an engine speed of 3000 RPM.

        Powertrain > Engine > Data List 

        Tester Display
        Engine Speed
        Mass Air Flow Sensor
        Coolant Temperature

      Standard

      GTS Display Condition Specified Condition
      Mass Air Flow Sensor Engine warmed up
      Shift lever position: neutral
      A/C: Off
      Engine Speed: 3000 RPM      		 Between 4.5 and 12 gm/sec

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  4

  4. INSPECT NO. 2 TURBO PRESSURE SENSOR 

    Refer to ON-VEHICLE INSPECTION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  5

  5. REPLACE TURBOCHARGER SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B4-73) 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.
    3. Start the engine and warm it up.
    4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    5. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    6. Input the DTC: P25B4-73.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P25B4-73 is output)      		 B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2022 - ]

    Result: 

    B 

    See step  7

  7. REPLACE ECM 

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

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  17

  8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 2 TURBO PRESSURE SENSOR) 
    1. Disconnect the No. 2 turbo pressure sensor 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
      C135-3 (VC) - C135-2 (E2) Ignition switch ON 4.5 to 5.5 V
      C135-1 (PTA) - C135-2 (E2) Ignition switch ON 3.0 to 5.0 V
      GTY1104505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Turbo Pressure Sensor)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. REPLACE NO. 2 TURBO PRESSURE SENSOR 

    Refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  17

  10. CHECK HARNESS AND CONNECTOR (NO. 2 TURBO PRESSURE SENSOR - ECM) 
    1. Disconnect the No. 2 turbo pressure sensor 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
      C135-3 (VC) - C142-80 (VPTA) Always Below 1 Ω
      C135-2 (E2) - C142-79 (EPTA) Always Below 1 Ω
      C135-1 (PTA) - C142-103 (PTA) Always Below 1 Ω
      C135-3 (VC) or C142-80 (VPTA) - Body ground and other terminals Always 10 kΩ or higher
      C135-1 (PTA) or C142-103 (PTA) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  11

  11. REPLACE ECM 

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

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  17

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace the wire harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  17

  13. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) 
    1. Disconnect the mass air flow meter 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
      C26-3 (VCC) - C26-2 (E2G) Ignition switch ON 4.8 to 5.2 V
      C26-1 (FG) - C26-2 (E2G) Ignition switch ON 4.8 to 5.2 V
      GTY1104502Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Mass Air Flow Meter Sub-assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  14

  14. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY 

    Refer to ON-VEHICLE INSPECTION [09/2022 - ]

    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 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

  15. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 
    1. Disconnect the mass air flow meter 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
      C26-3 (VCC) - C142-84 (VCVG) Always Below 1 Ω
      C26-1 (FG) - C142-107 (VG) Always Below 1 Ω
      C26-2 (E2G) - C142-83 (E2G) Always Below 1 Ω
      C26-3 (VCC) or C142-84 (VCVG) - Body ground and other terminals Always 10 kΩ or higher
      C26-1 (FG) or C142-107 (VG) - Body ground and other terminals Always 10 kΩ or higher
      C26-2 (E2G) or C142-83 (E2G) - 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 

  16. REPLACE VACUUM REGULATING VALVE ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  17

  17. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B4-73) 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.
    3. Start the engine and warm it up.
    4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    5. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    6. Input the DTC: P25B4-73.
      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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

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