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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 124 (Engine Control System (4GR-FSE) - Diagnostic Codes (1 Of 5)) >> SFI System >> DTC P0088: Fuel Rail / System Pressure - Too High [04/2013 - 08/2015] >> Procedure

DTC P0088: Fuel Rail / System Pressure - Too High [04/2013 - 08/2015]: Procedure

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    4. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P0088 is output A
      DTC P0088 and other DTCs are output B

      HINT: 

      If any DTCs other than P0088 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2013 - 06/2014]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [06/2014 - 08/2015] 

    Result: 

    A 

    See step  2

  2. CHECK FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas General / Fuel Press.

      Powertrain > Engine > Data List 

      Tester Display
      Fuel Press
    4. Check that the fuel pressure fluctuates when the engine is raced.

      OK

      Fuel pressure fluctuates.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR). Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  3

  3. REPLACE FUEL PUMP (FOR HIGH PRESSURE) 
    1. Replace the fuel pump (for high pressure).

      Refer to REMOVAL [04/2013 - 08/2015]

      HINT: 

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

      Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK IF DTC OUTPUT RECURS (SEE IF DTC P0088 IS OUTPUT AGAIN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait at for least 30 seconds.
    6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    8. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTC P0088 is output A
      DTCs are not output B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  5

  5. INSPECT FUEL RELIEF VALVE ASSEMBLY 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas General / Fuel Press.

      Powertrain > Engine > Data List 

      Tester Display
      Fuel Press
    5. Start the engine.
    6. Check the fuel pressure.

      Result

      Techstream Display Result Proceed to
      Fuel Press Less then 15300 kPag A
      15300 kPag or higher B

    Result: 

    A 

    REPLACE ECM. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    B 

    REPLACE FUEL RELIEF VALVE ASSEMBLY. Refer to  REMOVAL [04/2013 - 08/2015] 

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