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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 51 (Engine Control System (A25A-FXS) - Diagnostic Codes (P008B-P0110)) >> SFI System >> DTC P008B-00: Low Pressure Fuel System Pressure - Too High [11/2023 - ] >> Procedure

DTC P008B-00: Low Pressure Fuel System Pressure - Too High [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008B-00) 
    1. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P008B-00 is output A
      DTC P008B-00 and other DTCs are output B

      HINT: 

      If any DTCs other than P008B-00 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART  . Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2023 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

    Result: 

    A 

    See step  2

  2. READ VALUE USING GTS (FUEL PRESSURE (LOW) / FUEL PRESSURE 2) 
    1. Put the engine in Inspection Mode (Maintenance Mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    2. Start the engine.
    3. Record the Fuel Pressure (Low) / Fuel Pressure 2 value.

      Powertrain > Engine > Data List 

      Tester Display
      Fuel Pressure (Low) / Fuel Pressure 2
    4. Turn the ignition switch off.
    5. Discharge the fuel pressure.

      HINT: 

      DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

      1. Remove the EFI-MAIN NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      2. Put the engine in Inspection Mode (Maintenance Mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      3. Start the engine.
      4. After the engine has stopped on its own, turn the ignition switch off.

        HINT: 

        If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.

      5. Put the engine in Inspection Mode (Maintenance Mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      6. Crank the engine again and make sure that the engine does not start.
      7. Install the EFI-MAIN NO. 2 fuse.
    6. Compare the Fuel Pressure (Low) / Fuel Pressure 2 value recorded with the engine running to the Fuel Pressure (Low) / Fuel Pressure 2 value currently shown on the GTS.

      Powertrain > Engine > Data List 

      Tester Display
      Fuel Pressure (Low) / Fuel Pressure 2

      Result

      Result Proceed to
      Fuel Pressure (Low) / Fuel Pressure 2 value drops A
      Fuel Pressure (Low) / Fuel Pressure 2 value is maintained B

      HINT: 

      Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

      Refer to INITIALIZATION [10/2021 - ]

    Result: 

    B 

    REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE) 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS)) 
    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Refer to PROCEDURE - Step 2

    2. Compare the values in the Data List using the GTS and the fuel pressure gauge when the Active Test was performed.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Fuel Pump Duty Ratio (Brushless)
      Data List Display
      Fuel Pressure (Low) / Fuel Pressure 2

      Standard

      GTS Operation Standard
      Low Data List value and fuel pressure gauge are within +/-50 kPa of each other
      High

      HINT: 

      Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

      Refer to INITIALIZATION [10/2021 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE) 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    OK 

    See step  4

  4. PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS)) 
    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Refer to PROCEDURE - Step 2

    2. Read the values on the Data List and the fuel pressure gauge when the Active Test was performed.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Fuel Pump Duty Ratio (Brushless)
      Data List Display
      Fuel Pressure (Low) / Fuel Pressure 2

      Result

      GTS Operation Fuel Pressure (Low) / Fuel Pressure 2 Fuel pressure gauge Proceed to
      Low Below 600 kPa Below 600 kPa (6.1 kgf/cm 2 , 87 psi) A
      600 kPa or higher 600 kPa (6.1 kgf/cm 2 , 87 psi) or higher B

    Result: 

    B 

    REPLACE FUEL PUMP CONTROL ECU 

    Refer to REMOVAL [12/2019 - ]

    Result: 

    A 

    See step  5

  5. 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  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P008B-00) 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Check the DTC judgment result.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    3. Input the DTC: P008B-00.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P008B-00 is output)      		 B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - ]

    Result: 

    B 

    REPLACE ECM 

    Refer to REMOVAL [11/2023 - ]

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