СИСТЕМА ECD, Diagnostic DTC:P0191

DTC Code DTC Name
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

DESCRIPTION

Refer to DTC P0087.

Click hereНажмите здесь

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance The difference between the main and sub voltage outputs of the fuel pressure sensor is 0.04 V or less, or 1.06 V or higher for 1 second or more (1 trip detection logic).
  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor (built into common rail assembly)

  • ECM

Comes on DTC stored
Table 1. Related Data List
DTC No. Data List
P0191
  • Fuel Press

  • Target Common Rail Pressure

CONFIRMATION DRIVING PATTERN

DTC No. DTC Detection Drive Pattern
P0191 Idling for 1 second

WIRING DIAGRAM

Refer to DTC P0087.

Click hereНажмите здесь

CAUTION / NOTICE / HINT

Note:

After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click hereНажмите здесь).

Tip:

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING GTS (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press and Target Common Rail Pressure.

      Powertrain > Engine and ECT > Data List
      Tester Display
      Target Common Rail Pressure
      Fuel Press
    4. Start the engine.

    5. Check the change in the values for the Data List items above when increasing the engine speed from idling to 3000 rpm with no load.

      Result
      Result Proceed to

      Fuel Press is always 10000 kPa or less

      or

      Fuel Press is always 200000 kPa or higher

      A
      Except above B
      Tip:

      When in a stable condition such as when idling after warm up the engine, "Fuel Press" is +/-5000 kPa of "Target Common Rail Pressure".

    B Нажмите здесь

    GO TO STEP 4


    A
  2. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

    Click hereНажмите здесь

    Result
    Proceed to
    OK
    NG
    OK Нажмите здесь

    GO TO STEP 5


    NG
  3. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT
    NEXT
  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs
    4. Let the engine idle for 1 second.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes
      Result
      ResultProceed to
      DTC P0191 is outputA
      DTC is not outputB
    B

    END


    A
  5. REPLACE COMMON RAIL ASSEMBLY

    1. Replace the common rail assembly.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT
  6. BLEED AIR FROM FUEL SYSTEM

    1. Bleed the air from the fuel system.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT
  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs
    4. Let the engine idle for 1 second.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes
      Result
      ResultProceed to
      DTC P0191 is outputA
      DTC is not outputB
    B

    END


    A
  8. REPLACE ECM

    1. Replace the ECM.

      Click hereНажмите здесь

      Result
      Proceed to
      NEXT
    NEXT
  9. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs
    4. Let the engine idle for 1 second.

    5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    6. Confirm that the DTC is not output.

      Powertrain > Engine and ECT > Trouble Codes
      Result
      Proceed to
      NEXT
    NEXT

    END