SFI SYSTEM(for Rear Air Fuel Ratio Sensor), Diagnostic DTC:P25B473

DTC Code DTC Name
P25B473 Turbocharger/Supercharger Wastegate "A" Actuator Stuck Closed

DESCRIPTION

Refer to DTC P024313.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P25B473 Turbocharger/Supercharger Wastegate "A" Actuator Stuck Closed The boost pressure does not drop despite control to open the waste gate valve (2 trip detection logic).

  • Waste gate valve

  • Waste gate valve actuator with bracket assembly

  • Vacuum regulating valve assembly

  • No. 2 turbo pressure sensor

  • Mass air flow meter sub-assembly

  • Wire harness or connector

  • ECM

 Comes on DTC stored SAE Code: P25B4

MONITOR DESCRIPTION

Monitors the turbocharging pressure when the waste gate valve receives an open command. A waste gate valve stuck close malfunction occurs when the turbocharging variation, which results from 2 operation conditions with differing air volumes, becomes equal to, or greater than, the judgment variation. The ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Required Sensors/Components

No. 2 turbo pressure sensor

Mass air flow meter sub-assembly
Frequency of Operation Once per driving cycle

CONFIRMATION DRIVING PATTERN

B007YHFE01

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

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

  6. Turn the engine switch on (IG).

  7. Turn the GTS on.

  8. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].

  9. Drive the vehicle at 30 to 50 km/h (19 to 31 mph) for 10 seconds or more [B].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  10. Drive the vehicle at 80 km/h (50 mph) or more for 10 seconds or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  11. Enter the following menus: Powertrain / Engine / Trouble Codes [D].

  12. 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.

  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  14. Input the DTC: P25B473.

  15. 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

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE, perform steps [B] through [D] again.

WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.

Click here

Refer to DTC P023511 for No. 2 turbo pressure sensor circuit.

Click here

CAUTION / NOTICE / HINT

Tech Tips

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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P25B473)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P25B473 is output A
      DTC P25B473 and other DTCs are output B

      Tech Tips

      If any DTCs other than P25B473 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK VACUUM REGULATING VALVE ASSEMBLY

    B007XINC01
    *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

    NG

    REPLACE VACUUM REGULATING VALVE ASSEMBLY Click here

    OK

  3. INSPECT WASTE GATE VALVE (TURBINE WITH VALVE HOUSING SUB-ASSEMBLY)


    1. Inspect the waste gate valve.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TURBINE WITH VALVE HOUSING SUB-ASSEMBLY Click here

    OK

  4. INSPECT WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY


    1. Inspect the waste gate valve actuator with bracket assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY Click here

    OK

  5. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


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

      Click here

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

      Click here

    3. Inspect the function of the mass air flow meter sub-assembly.


      1. Connect the GTS to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the GTS 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. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

      6. Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

        Standard
        GTS Display Condition Specified Condition
        Mass Air Flow Sensor

        • Shift lever position: P

        • A/C switch: Off

        • Engine warmed up

        • Engine Speed: 3000 rpm

        		 Between 6.0 and 18.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY) Click here

    OK

  6. INSPECT NO. 2 TURBO PRESSURE SENSOR


    1. Inspect the No. 2 turbo pressure sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 2 TURBO PRESSURE SENSOR) Click here

    OK

  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B473)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P25B473.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P25B473 is output)

      		 B

    A

    END

    B

  9. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  10. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 2 TURBO PRESSURE SENSOR)

    B007ZOEC52
    *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
      D55-3 (VC) - D55-1 (E2) Engine switch on (IG) 4.5 to 5.5 V
      D55-2 (PTA) - D55-1 (E2) Engine switch on (IG) 3.0 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  11. REPLACE NO. 2 TURBO PRESSURE SENSOR


    1. Replace the No. 2 turbo pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  12. 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
      D55-3 (VC) - D1-140 (VPTA) Always Below 1 Ω
      D55-2 (PTA) - D1-108 (PTA) Always Below 1 Ω
      D55-1 (E2) - D1-139 (EPTA) Always Below 1 Ω
      D55-3 (VC) or D1-140 (VPTA) - Body ground and other terminals Always 10 kΩ or higher
      D55-2 (PTA) or D1-108 (PTA) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  13. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the wire harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  15. CHECK TERMINAL VOLTAGE (POWER SOURCE OF MASS AIR FLOW METER SUB-ASSEMBLY)

    B007ZMAC65
    *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 Switch Condition Specified Condition
      D9-3 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - MASS AIR FLOW METER SUB-ASSEMBLY) Click here

    OK

  16. 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
      D9-5 (VG) - D1-92 (VG) Always Below 1 Ω
      D9-4 (E2G) - D1-91 (E2G) Always Below 1 Ω
      D9-5 (VG) or D1-92 (VG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  17. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  18. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the wire harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  19. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR POWER INTEGRATION ECU - MASS AIR FLOW METER SUB-ASSEMBLY)


    1. Disconnect the semiconductor power 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
      1G-1 - D9-3 (+B) Always Below 1 Ω
      1G-1 or D9-3 (+B) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. REPLACE WASTE GATE VALVE ACTUATOR WITH BRACKET ASSEMBLY


    1. Replace the waste gate valve actuator with bracket assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  21. REPLACE TURBINE WITH VALVE HOUSING SUB-ASSEMBLY


    1. Replace the turbine with valve housing sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 23 Click here

  22. REPLACE VACUUM REGULATING VALVE ASSEMBLY


    1. Replace the vacuum regulating valve assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  23. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  24. CHECK WHETHER DTC OUTPUT RECURS (DTC P25B473)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Utility / All Readiness.


      Powertrain > Engine > Utility
      Tester Display
      All Readiness

    3. Input the DTC: P25B473.

    4. 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
      Result
      Proceed to
      NEXT

    NEXT

    END