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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Control System (8AR-FTS) - Diagnostic Codes (13 Of 14)) >> SFI System >> DTC P25B3-72: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Open [08/2015 - 09/2022] >> Procedure

DTC P25B3-72: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Open [08/2015 - 09/2022]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P25B3-72) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P25B3-72 is output A
      DTC P25B3-72 and other DTCs are output B

      HINT: 

      If any DTCs other than P25B3-72 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 10/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2016 - 10/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2018]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2018 - 09/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 09/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 11/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 09/2022] 

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE WASTEGATE VALVE DUTY RATIO) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Wastegate Valve Duty Ratio.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Wastegate Valve Duty Ratio
    5. Perform the Active Test. Check that the waste gate valve is operating.

      OK

      The waste gate valve is operating.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  20

    Result: 

    OK 

    See step  3

  3. INSPECT AIR BY-PASS VALVE ASSEMBLY 
    1. Inspect the air by-pass valve assembly, referring to On-vehicle Inspection for Air by-pass Valve Assembly.

      Refer to ON-VEHICLE INSPECTION [08/2015 - ]

    2. Inspect the air by-pass valve assembly, referring to Inspection for Air by-pass Valve Assembly.

      Refer to INSPECTION [08/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  4

  4. 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 [08/2015 - 09/2020] , or refer to ON-VEHICLE INSPECTION [09/2020 - ]

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

      Refer to INSPECTION [08/2015 - ]

    3. Inspect the operation of the mass air flow meter sub-assembly.
      1. Connect the Techstream to the DLC3.
      2. Start the engine.
      3. Turn the Techstream on.
      4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

        Powertrain > Engine > Data List 

        Tester Display
        Engine Speed
        Mass Air Flow Sensor
        Coolant Temperature
      5. Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.
      6. Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

        Standard

        Techstream Display Condition Specified Condition
        Mass Air Flow Sensor Engine warmed up
        Shift lever position: P
        A/C: Off
        Engine Speed: 3000 rpm        		 Between 6.0 gm/sec and 18.0 gm/sec

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  5

  5. INSPECT NO. 2 TURBO PRESSURE SENSOR 
    1. Inspect the No. 2 turbo pressure sensor.

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B3-72) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Start the engine and warm it up.
    7. Turn the Techstream on.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    10. Input the DTC: P25B3-72.
    11. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P25B3-72 is output)      		 B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2015 - ] 

    Result: 

    B 

    See step  7

  7. REPLACE ECM 
    1. Replace the ECM.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 2 TURBO PRESSURE SENSOR) 
    GTY643313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to No. 2 Turbo Pressure Sensor)
    1. Disconnect the No. 2 turbo pressure sensor 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
      F81-3 (VC) - F81-1 (E2) Engine switch on (IG) 4.75 to 5.25 V
      F81-2 (PTA) - F81-1 (E2) Engine switch on (IG) 3.0 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. REPLACE NO. 2 TURBO PRESSURE SENSOR 
    1. Replace the No. 2 turbo pressure sensor.

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  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
      F81-3 (VC) - F78-140 (VPTA) Always Below 1 Ω
      F81-2 (PTA) - F78-108 (PTA) Always Below 1 Ω
      F81-1 (E2) - F78-139 (EPTA) Always Below 1 Ω
      F81-3 (VC) or F78-140 (VPTA) - Body ground and other terminals Always 10 kΩ or higher
      F81-2 (PTA) or F78-108 (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 
    1. Replace the ECM.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  13. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) 
    GTY662197Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Mass Air Flow Meter Sub-assembly)
    1. Disconnect the mass air flow meter sub-assembly 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
      F40-3 (+B) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  14

  14. 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
      F40-5 (VG) - F78-92 (VG) Always Below 1 Ω
      F40-4 (E2G) - F78-91 (E2G) Always Below 1 Ω
      F40-5 (VG) or F78-92 (VG) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  19

    Result: 

    OK 

    See step  15

  15. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Replace the mass air flow meter sub-assembly.

      Refer to REMOVAL [08/2015 - ]

      HINT: 

      Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

      Refer to INITIALIZATION [08/2015 - 09/2018] , or refer to INITIALIZATION [09/2018 - 09/2019] , or refer to INITIALIZATION [09/2019 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  16. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - MASS AIR FLOW METER SUB-ASSEMBLY) 
    1. Disconnect the semiconductor pwr integration ECU connector.
    2. Disconnect the mass air flow meter sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2G-1 - F40-3 (+B) Always Below 1 Ω
      2G-1 or F40-3 (+B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  19

    Result: 

    OK 

    See step  17

  17. REPLACE SEMICONDUCTOR POWER INTEGRATION ECU 
    1. Replace the semiconductor pwr integration ECU.

      Refer to REMOVAL [04/2013 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  18. REPLACE AIR BY-PASS VALVE ASSEMBLY 
    1. Replace the air by-pass valve assembly.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  20. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE WASTEGATE VALVE DUTY RATIO) 
    GTY636611Courtesy 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. Connect the Techstream to the DLC3.
    3. Start the engine.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Wastegate Valve Duty Ratio.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Wastegate Valve Duty Ratio
    6. When the waste gate valve is operated using the Techstream, check whether the vacuum hose of the waste gate valve actuator with bracket assembly applies suction your finger.

      OK

      Techstream Operation Specified Condition
      100% Vacuum hose applies suction to finger
      0% Vacuum hose applies no suction to finger

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  24

    Result: 

    OK 

    See step  21

  21. INSPECT WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY AND WASTE GATE VALVE (TURBINE HOUSING WITH VALVE SUB-ASSEMBLY) 
    1. Inspect the waste gate valve actuator with bracket assembly.

      Refer to INSPECTION [08/2015 - ]

    2. Inspect the waste gate valve.

      Refer to PROCEDURE - Step 1

      Result

      Result Proceed to
      Waste gate valve actuator with bracket assembly is abnormal A
      Waste gate valve is abnormal B

    Result: 

    B 

    See step  23

    Result: 

    A 

    See step  22

  22. REPLACE WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY 
    1. Replace the waste gate valve actuator with bracket assembly.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  23. REPLACE TURBINE HOUSING WITH VALVE SUB-ASSEMBLY 
    1. Replace the turbine housing with valve sub-assembly.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  24. CHECK VACUUM PUMP ASSEMBLY 
    GTY684749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Vacuum Regulating Valve Assembly
    1. Disconnect the vacuum hose (vacuum pump assembly side) of the vacuum regulating valve assembly.
    2. Start the engine.
    3. Check whether the vacuum hose of the vacuum regulating valve assembly applies suction your finger.

      OK

      Vacuum hose applies suction to finger.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  25

  25. INSPECT VACUUM REGULATING VALVE ASSEMBLY 
    1. Inspect the vacuum regulating valve assembly.

      Refer to INSPECTION [08/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  27

    Result: 

    OK 

    See step  26

  26. REPAIR OR REPLACE VACUUM HOSE (WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY - VACUUM REGULATING VALVE ASSEMBLY) 
    1. repair or replace the vacuum hose (waste gate valve actuator with bracket assembly - vacuum regulating valve assembly)

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  27. REPLACE VACUUM REGULATING VALVE ASSEMBLY 
    1. Replace the vacuum regulating valve assembly.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  28. INSPECT VACUUM PUMP ASSEMBLY 
    1. Inspect the vacuum pump assembly.

      Refer to ON-VEHICLE INSPECTION [08/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  30

    Result: 

    OK 

    See step  29

  29. REPAIR OR REPLACE VACUUM LINE (VACUUM REGULATING VALVE ASSEMBLY - VACUUM PUMP ASSEMBLY) 
    1. repair or replace the vacuum line (vacuum regulating valve assembly - vacuum pump assembly).

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  30. REPLACE VACUUM PUMP ASSEMBLY 
    1. Replace the vacuum pump assembly.

      Refer to REMOVAL [08/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  31

  31. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B3-72) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Start the engine and warm it up.
    7. Turn the Techstream on.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    10. Input the DTC: P25B3-72.
    11. 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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

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