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DTC P0234-00: Turbocharger/Supercharger "A" Overboost Condition [09/2022 - ]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0234-00) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      P0234-00 is output A
      P0234-00 and other DTCs are output B

      HINT: 

      If any DTCs other than P0234-00 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART 

    Result: 

    A 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. READ OUTPUT DTC 
    1. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
    2. Turn the ignition switch off and wait for at least 30 seconds.
    3. Start the engine and wait 1 minute or more.

      HINT: 

      At this time, waste gate valve active detection is performed to check for malfunctions in the waste gate valve system.

    4. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC is not output A
      DTCs are output B

    Result: 

    B 

    GO TO DTC CHART 

    Result: 

    A 

    See step  4

  4. READ VALUE USING GTS (ATMOSPHERIC PRESSURE) 
    1. Enter the following menus.

      Powertrain > Engine > Data List 

      Tester Display
      Atmospheric Pressure
    2. Using the table, read the normal atmospheric pressure value for the applicable altitude and temperature.
      GTY518158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      • Standard atmospheric pressure is approximately 101 kPa (abs) (15 psi (abs)).
      • For every 100 m (328 ft.) increase in altitude, atmospheric pressure drops by approximately 1 kPa (0.15 psi). This varies by weather.
    3. Compare the Atmospheric pressure value in the Data List with the normal atmospheric value from the table.

      Result

      Result Proceed to
      Other than the following A
      Difference between Atmospheric Pressure in the Data List and normal atmospheric pressure value is 10 kPa (1.45 psi) or more. B

    Result: 

    B 

    REPLACE ECM 

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

    Result: 

    A 

    See step  5

  5. READ VALUE USING GTS (INTAKE AIR TEMPERATURE) 
    1. Enter the following menus.

      Powertrain > Engine > Data List 

      Tester Display
      Intake Air Temperature
    2. Read the Data List after cooling the engine sufficiently.

      Result

      Result Proceed to
      Other than the following A
      Difference between Intake Air Temperature in the Data List and actual outside air temperature value is 15°C (27°F) or more. B

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  6

  6. 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 - ]

      HINT: 

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

      Refer to INITIALIZATION [09/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  7

  7. INSPECT NO. 2 TURBO PRESSURE SENSOR 

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

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  13

    Result: 

    OK 

    See step  8

  8. INSPECT MANIFOLD ABSOLUTE PRESSURE SENSOR 

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

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  9

  9. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P0234-00) 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Enter the following menus.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P0234-00.
    4. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (P0234-00 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

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

  11. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the manifold absolute 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
      C134-3 (VC) - C134-1 (E2) Ignition switch ON 4.5 to 5.5 V
      C134-2 (PIC) - C134-1 (E2) Ignition switch ON 3.0 to 5.5 V
      GTY1107795Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Manifold Absolute Pressure Sensor)
    4. Turn the ignition switch off and wait for at least 30 seconds.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C134-3 (VC) - C134-2 (PIC) Ignition switch off 171 to 189 kΩ
      C134-1 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    NG 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (MANIFOLD ABSOLUTE PRESSURE SENSOR - ECM) 
    1. Disconnect the manifold absolute 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
      C134-3 (VC) - C142-82 (VCPC) Always Below 1 Ω
      C134-2 (PIC) - C142-105 (PIC) Always Below 1 Ω
      C134-1 (E2) - C142-81 (EPIC) Always Below 1 Ω
      C134-3 (VC) or C142-82 (VCPC) - Body ground and other terminals Always 10 kΩ or higher
      C134-2 (PIC) or C142-105 (PIC) - 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] , or refer to REMOVAL [09/2024 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR 
    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 5.5 V
      GTY1104505Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Turbo Pressure Sensor)
    4. Turn the ignition switch off and wait for at least 30 seconds.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C135-3 (VC) - C135-1 (PTA) Ignition switch off 171 to 189 kΩ
      C135-2 (E2) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 TURBO PRESSURE SENSOR 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    NG 

    See step  14

  14. 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
      C135-1 (PTA) - C142-103 (PTA) Always Below 1 Ω
      C135-2 (E2) - C142-79 (EPTA) 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: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. CHECK HARNESS AND CONNECTOR 
    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
      GTY1108628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Mass Air Flow Meter Sub-assembly)
    4. Turn the ignition switch off and wait for at least 30 seconds.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C26-3 (VCC) - C26-1 (FG) Ignition switch off 2.09 to 2.31 kΩ
      C26-2 (E2G) - Body ground Always Below 1 Ω

      HINT: 

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

      Refer to INITIALIZATION [09/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    NG 

    See step  16

  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
      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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY (INTAKE AIR TEMPERATURE SENSOR) 

    Refer to INSPECTION [09/2022 - ]

    HINT: 

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

    Refer to INITIALIZATION [09/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 

    Refer to REMOVAL [09/2022 - ]

    Result: 

    OK 

    See step  18

  18. 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
      C26-4 (THA) - C142-106 (THA) Always Below 1 Ω
      C26-2 (E2G) - C142-83 (E2G) Always Below 1 Ω
      C26-4 (THA) or C142-106 (THA) - 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] , or refer to REMOVAL [09/2024 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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