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Home >> Toyota >> 2018 >> Highlander LE Plus, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 111 (SFI System (2GR-FXS) - Diagnostic Codes - (Hybrid) (3 Of 4)) >> SFI System >> DTC P008A: Low Pressure Fuel System Pressure - Too Low [11/2016 - ] >> Procedure

DTC P008A: Low Pressure Fuel System Pressure - Too Low [11/2016 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FUEL LEAK 
    1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

      OK

      No fuel leaks present.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE FUEL LEAK POINT 

    Result: 

    OK 

    See step  2

  2. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008A) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes 

      Result

      Result Proceed to
      DTC P008A is output A
      DTC P008A and other DTCs are output B

      HINT: 

      If any DTCs other than P008A are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017]  or  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - ] 

    Result: 

    A 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty.

      Powertrain > Engine and ECT > Active Test 

      Tester Display
      Control the Fuel Pump Duty
    5. Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.

      Standard

      Techstream Operation Standard
      High Operating sounds can be heard from fuel pump (for low pressure side)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO FUEL PUMP CONTROL CIRCUIT. Refer to  FUEL PUMP CONTROL CIRCUIT [11/2016 - ] 

    Result: 

    OK 

    See step  4

  4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY) 
    1. Discharge the fuel pressure.

      HINT: 

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

      1. Remove the FUEL PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      2. Connect the Techstream to the DLC3.
      3. Turn the power switch on (IG).
      4. Turn the Techstream on.
      5. Put the engine in inspection mode (maintenance mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      6. Start the engine.
      7. After the engine has stopped on its own, turn the power switch off.

        HINT: 

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

      8. Turn the power switch on (IG).
      9. Put the engine in inspection mode (maintenance mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      10. Crank the engine again and make sure that the engine does not start.
      11. Install the FUEL PMP fuse.
    2. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Control the Fuel Pump Duty
      Data List Display
      Low Fuel Pressure Sensor
    3. Read the value displayed on the Techstream when the Active Test was performed.

      Standard

      Techstream Operation Standard
      Low to High When switching from Low to High, Low Fuel Pressure Sensor value changes

      HINT: 

      Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY) 
    1. Discharge the fuel pressure.

      HINT: 

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

      1. Remove the FUEL PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      2. Connect the Techstream to the DLC3.
      3. Turn the power switch on (IG).
      4. Turn the Techstream on.
      5. Put the engine in inspection mode (maintenance mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      6. Start the engine.
      7. After the engine has stopped on its own, turn the power switch off.

        HINT: 

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

      8. Turn the power switch on (IG).
      9. Put the engine in inspection mode (maintenance mode).

        Powertrain > Hybrid Control > Utility 

        Tester Display
        Inspection Mode
      10. Crank the engine again and make sure that the engine does not start.
      11. Install the FUEL PMP fuse.
    2. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Control the Fuel Pump Duty
      Data List Display
      Low Fuel Pressure Sensor
    3. Read the value displayed on the Techstream when the Active Test was performed.

      Standard

      Techstream Operation Low Fuel Pressure Sensor
      Low 50 kPa (gauge) [7.253 psi (gauge)] or higher
      High 500 kPa (gauge) [72.525 psi (gauge)] or higher

      HINT: 

      Once the fuel pressure becomes high, the fuel pressure will not decrease, even when switched from High to Low. Therefore, make sure that the fuel pressure is low before checking that the fuel pressure changes when switching from Low to High.

      OK

      Actual Low and High values are as shown above.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY) 
    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Refer to PROCEDURE - STEP 2

    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Control the Fuel Pump Duty
      Data List Display
      Low Fuel Pressure Sensor
    6. Compare the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed.

      Standard

      Techstream Operation Standard
      Low Data List value and fuel pressure gauge are within +/-50 kPa (7.25 psi) of each other
      High

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

      Refer to INITIALIZATION [11/2016 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)). Refer to  REMOVAL [11/2016 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P008A) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the power switch off and wait for at least 30 seconds.
    6. Turn the power switch on (IG).
    7. Turn the Techstream on.
    8. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    9. Start the engine and warm it up.
    10. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      Powertrain > Engine and ECT > Utility 

      Tester Display
      All Readiness
    12. Input the DTC: P008A.
    13. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P008A is output)      		 B

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [11/2016 - ] 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [11/2016 - ] 

  8. READ VALUE USING TECHSTREAM (LOW FUEL PRESSURE SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    5. Start the engine.
    6. Enter the following menus: Powertrain / Engine and ECT / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Low Fuel Pressure Sensor
    7. Record the Low Fuel Pressure Sensor value.
    8. Turn the power switch off.
    9. Wait for 10 seconds.
    10. Turn the power switch on (IG).
    11. Turn the Techstream on.
    12. Enter the following menus: Powertrain / Engine and ECT / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Low Fuel Pressure Sensor
    13. Compare the Low Fuel Pressure Sensor value recorded with the engine running to the Low Fuel Pressure Sensor value currently shown on the Techstream.

      Result

      Result Proceed to
      Low Fuel Pressure Sensor value is maintained A
      Low Fuel Pressure Sensor value drops B

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

      Refer to INITIALIZATION [11/2016 - ]

    Result: 

    A 

    REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [11/2016 - ] 

    Result: 

    B 

    REPLACE FUEL MAIN VALVE ASSEMBLY (FOR HIGH PRESSURE SIDE). Refer to  REMOVAL [11/2016 - ] 

  9. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP DUTY) 
    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Refer to PROCEDURE - STEP 2

    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump Duty / Data List / Low Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Control the Fuel Pump Duty
      Data List Display
      Low Fuel Pressure Sensor
    6. Read the values in the Data List using the Techstream and the fuel pressure gauge when the Active Test was performed.

      Result

      Techstream Operation Result Proceed to
      Low to High Data List value does not change, but fuel pressure gauge changes A
      Data List value and fuel pressure gauge do not change B

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for low pressure side).

      Refer to INITIALIZATION [11/2016 - ]

    Result: 

    A 

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)). Refer to  REMOVAL [11/2016 - ] 

    Result: 

    B 

    REPLACE FUEL PUMP CONTROL ECU. Refer to  REMOVAL [11/2016 - ] 

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