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DTC P0088 Fuel Rail / System Pressure - Too High: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

Refer to DTC P0190  .

HINT:

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction (See FREEZE FRAME DATA  ).

  1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Clear DTCs.
    4. Start the engine.
    5. Enter the following menus: DIAGNOSIS / OBD / MOBD / DTC INFO / CURRENT CODES.
    6. Read the DTCs using the intelligent tester.

      Result 

      RESULT REFERENCE

      Display (DTC output) Proceed to
      P0088 A
      P0088 and other DTCs B

      HINT:

      If any codes other than P0088 are output, perform troubleshooting for those DTCs first.

    B : GO TO  DTC CHART  

    A : GO TO NEXT STEP 

  2. CHECK FUEL PRESSURE SENSOR 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Start the engine.
    4. Turn the tester on.
    5. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / ACTIVE TEST / TARGET FUEL PRESS / USER DATA / FUEL PRESS.
    6. Check that the fuel pressure fluctuates when the target fuel pressure changes.

      HINT:

      The TARGET FUEL PRESS operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure 25%.

      OK: Fuel pressure fluctuates. 

    NG : REPLACE FUEL PRESSURE SENSOR 

    OK : GO TO NEXT STEP 

  3. REPLACE FUEL PUMP (FOR HIGH PRESSURE) 

    NEXT 

  4. CHECK IF DTC OUTPUT REOCCURS (SEE IF DTC P088 IS OUTPUT AGAIN) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Clear DTCs.
    4. Start the engine.
    5. Enter the following menus: DIAGNOSIS / OBD / MOBD / DTC INFO / CURRENT CODES.
    6. Read the DTCs using the intelligent tester.

      Result 

      RESULT REFERENCE

      Display (DTC output) Proceed to
      P0088 A
      No output B

    B : END 

    A : REPLACE ECM 

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