SFI SYSTEM, Diagnostic DTC:P008B00

DTC Code DTC Name
P008B00 Low Pressure Fuel System Pressure - Too High

DESCRIPTION

Refer to DTC P008A00.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P008B00 Low Pressure Fuel System Pressure - Too High Actual fuel pressure (for low pressure side) value higher than target fuel pressure (for low pressure side) by threshold or more (1 trip detection logic).

  • Fuel pump control ECU

  • Fuel pressure sensor (for low pressure side)

  • ECM

 Does not come on DTC stored SAE Code: P008B

MONITOR DESCRIPTION

If the fuel pressure (for low pressure side) increases despite a decrease request signal being sent to the fuel pump control ECU by the ECM, the ECM will store this DTC.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

B006MUZE20

  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) [A].

  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 [B].

  9. Drive the vehicle for 15 minutes or more [C].

    CAUTION:

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

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

  11. 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.

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

  13. Input the DTC: P008B00.

  14. 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 is NORMAL, the system is normal.

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

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

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 OTHER DTCS OUTPUT (IN ADDITION TO DTC P008B00)


    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 P008B00 is output A
      DTC P008B00 and other DTCs are output B

      Tech Tips

      If any DTCs other than P008B00 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING GTS (FUEL PRESSURE (LOW))


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Start the engine.

    5. Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).


      Powertrain > Engine > Data List
      Tester Display
      Fuel Pressure (Low)

    6. Record the Fuel Pressure (Low) value.

    7. Turn the engine switch off.

    8. Discharge the fuel pressure.

      Tech Tips

      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.

      2. Start the engine.

      3. After the engine has stopped on its own, turn the engine switch off.

        Tech Tips

        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.

      4. Crank the engine again and make sure that the engine does not start.

      5. Install the EFI-MAIN NO. 2 fuse.

    9. Turn the engine switch on (IG).

    10. Turn the GTS on.

    11. Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (Low).


      Powertrain > Engine > Data List
      Tester Display
      Fuel Pressure (Low)

    12. Compare the Fuel Pressure (Low) value recorded with the engine running to the Fuel Pressure (Low) value currently shown on the GTS.

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

      Tech Tips

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

      Click here


    B

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)) Click here

    A

  3. PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO)


    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Fuel Pump Duty Ratio
      Data List Display
      Fuel Pressure (Low)

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

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

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY (FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)) Click here

    OK

  4. PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO)


    1. Install the fuel pressure gauge (for low pressure line of low pressure side).

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump Duty Ratio / Data List / Fuel Pressure (Low).


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Fuel Pump Duty Ratio
      Data List Display
      Fuel Pressure (Low)

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

      Result
      GTS Operation Fuel Pressure (Low) Fuel pressure gauge Proceed to
      Low Below 600 kPag

      Below 600 kPa (6.1 kgf/cm2, 87 psi)

      		 A
      600 kPag or higher

      600 kPa (6.1 kgf/cm2, 87 psi) or higher

      		 B

    B

    REPLACE FUEL PUMP CONTROL ECU Click here

    A

  5. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P008B00)


    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: P008B00.

    4. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P008B00 is output)

      		 B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE ECM Click here