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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 106 (Engine Control System - Diagnostic Codes (7 Of 7) & Symptom Tests (1 Of 2)) >> SFI SYSTEM (for 1Motor-HEV Model) >> DTC P25B3-72: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Open [09/2023 - ] >> Procedure

DTC P25B3-72: Turbocharger/Supercharger Wastegate "A" Actuator Stuck Open [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P25B3-72) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

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

      HINT: 

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

    Result: 

    A 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    B 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE WASTEGATE VALVE DUTY RATIO) 

    Pre-procedure1

    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • Start the engine.
    • Perform the Active Test. Check that the waste gate valve is operating.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Wastegate Valve Duty Ratio

      OK

      The waste gate valve is operating.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    See step  11

    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 [09/2023 - ]

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

      Refer to INSPECTION [09/2023 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  4

  4. INSPECT NO. 2 TURBO PRESSURE SENSOR 

    Refer to ON-VEHICLE INSPECTION [09/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CLEAR DTC 

    Pre-procedure1

    • None
    • Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off and wait for at least 30 seconds.

    Result: 

    NEXT 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B3-72) 

    Pre-procedure1

    • Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    • Perform the All Readiness.

      Powertrain > Engine > Utility 

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

      Result

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

    Post-procedure1

    • None

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

  7. CHECK HARNESS AND CONNECTOR 

    Pre-procedure1

    • Disconnect the No. 2 turbo pressure sensor connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C42-3 (VC) - C42-2 (E2) Ignition switch ON 4.5 to 5.5 V V
      C42-1 (PTA) - C42-2 (E2) Ignition switch ON 3.0 to 5.5 V V

    Post-procedure1

    • Turn the ignition switch off and wait for at least 30 seconds.

    Pre-procedure2

    • None
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C42-3 (VC) - C42-1 (PTA) Ignition switch off 171 to 189 kΩ kΩ
      C42-2 (E2) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure2

    • None

    Result: 

    OK 

    REPLACE NO. 2 TURBO PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (NO. 2 TURBO PRESSURE SENSOR - ECM) 

    Pre-procedure1

    • Disconnect the No. 2 turbo pressure sensor connector.
    • Disconnect the ECM connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C42-3 (VC) - C26-102 (VPTA) Always Below 1 Ω Ω
      C42-1 (PTA) - C26-126 (PTA) Always Below 1 Ω Ω
      C42-2 (E2) - C26-125 (EPTA) Always Below 1 Ω Ω
      C42-3 (VC) or C26-102 (VPTA) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C42-1 (PTA) or C26-126 (PTA) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HARNESS AND CONNECTOR 

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Turn the ignition switch to ON.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C13-3 (VCC) - C13-2 (E2G) Ignition switch ON 4.8 to 5.2 V V
      C13-1 (FG) - C13-2 (E2G) Ignition switch ON 4.8 to 5.2 V V

    Post-procedure1

    • Turn the ignition switch off and wait for at least 30 seconds.

    Pre-procedure2

    • None
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C13-3 (VCC) - C13-1 (FG) Ignition switch off 2.09 to 2.31 kΩ kΩ
      C13-2 (E2G) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure2

    • None

    Result: 

    OK 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 

    Pre-procedure1

    • Disconnect the mass air flow meter sub-assembly connector.
    • Disconnect the ECM connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C13-3 (VCC) - C26-73 (VCVG) Always Below 1 Ω Ω
      C13-1 (FG) - C26-75 (VG) Always Below 1 Ω Ω
      C13-2 (E2G) - C26-74 (E2G) Always Below 1 Ω Ω
      C13-3 (VCC) or C26-73 (VCVG) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C13-1 (FG) or C26-75 (VG) - Body ground and other terminals Always 10 kΩ or higher kΩ
      C13-2 (E2G) or C26-74 (E2G) - Body ground and other terminals Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. PERFORM ACTIVE TEST USING GTS (CONTROL THE WASTEGATE VALVE DUTY RATIO) 

    Pre-procedure1

    • Disconnect the vacuum hose of the waste gate valve actuator with bracket assembly.
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • Start the engine.
    • Perform the Active Test using the GTS.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Wastegate Valve Duty Ratio
    • When the waste gate valve is operated using the GTS, check whether the vacuum hose of the waste gate valve actuator with bracket assembly applies suction your finger.
      GTY1235015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Waste Gate Valve Actuator with Bracket Assembly

      OK

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

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE TURBOCHARGER SUB-ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK VACUUM PUMP ASSEMBLY 

    Pre-procedure1

    • Disconnect the vacuum hose (vacuum pump assembly side) of the vacuum regulating valve assembly.
    • Put the engine in Inspection Mode (for measuring Exhaust Gas).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    • Start the engine.
    • Check whether the vacuum hose of the vacuum regulating valve assembly applies suction your finger.
      GTY1231335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Vacuum Regulating Valve Assembly

      OK

      Vacuum hose applies suction to finger.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  13

  13. INSPECT VACUUM REGULATING VALVE ASSEMBLY 

    Refer to INSPECTION [09/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE VACUUM HOSE (WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY - VACUUM REGULATING VALVE ASSEMBLY) 

    Result: 

    NG 

    REPLACE VACUUM REGULATING VALVE ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

  14. INSPECT VACUUM PUMP ASSEMBLY 

    Refer to ON-VEHICLE INSPECTION [09/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE VACUUM LINE (VACUUM REGULATING VALVE ASSEMBLY - VACUUM PUMP ASSEMBLY) 

    Result: 

    NG 

    REPLACE VACUUM PUMP ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

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