SFI SYSTEM, Diagnostic DTC:P0191

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

DESCRIPTION

Refer to DTC P0192 Click here.

DTC No. Detection Item DTC Detection Condition Trouble Area
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

Either of following conditions is met (2 trip detection logic):


  • When target high pressure side fuel pressure changes, the change in fuel pressure sensor value is abnormal.

  • Although engine has been stopped and left as is for a long time, high pressure side fuel pressure is higher or lower than threshold.

  • Fuel pressure

  • Fuel pressure sensor

  • Open or short in fuel pressure sensor circuit

  • ECM

  • Lack of fuel

MONITOR DESCRIPTION



MONITOR STRATEGY

Required Sensors/Components Fuel pressure sensor
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

B002BSSE02

  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the power switch off and wait for at least 30 seconds.

  5. Turn the power switch on (IG) and turn the GTS on [A].

  6. Start the engine and warm it up [B].

  7. With the engine running, drive the vehicle for 15 minutes or more [C].

    Note

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

    Tech Tips

    If the engine stops, further depress the accelerator pedal to restart the engine.

  8. Turn the power switch off.

  9. With the engine stopped, leave the vehicle as is for 5 hours or more [D].

  10. Turn the power switch on (IG) and turn the GTS on [E].

  11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].

  12. 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.

  13. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  14. Input the DTC: P0191.

  15. 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

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

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [F] again.

WIRING DIAGRAM

Refer to DTC P0192 Click here.

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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0191)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.

      Result Proceed to
      DTC P0191 is output A
      DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output
      DTC P0191 and other DTCs are output B

      Tech Tips

      If DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output simultaneously, troubleshoot for DTC P0191 first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK FUEL LEAK


    1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

      OK
      No fuel leaks present.

    NG

    REPAIR OR REPLACE FUEL LEAK POINT Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Target Fuel Pressure / Fuel System / High Fuel Pressure Sensor.

    5. Check the value of the Data List item "High Fuel Pressure Sensor" when the target fuel pressure is increased and decreased using the Active Test.

      Result
      Result Proceed to
      "High Fuel Pressure Sensor" value follows the change in target fuel pressure A
      "High Fuel Pressure Sensor" value does not follow the change in target fuel pressure B

    B

    REPLACE FUEL PRESSURE SENSOR Click here

    A

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


    1. Disconnect the ECM connector.

    2. Disconnect the fuel pressure sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F5-86 (PR) - F45-3 (PR) Always Below 1 Ω
      F5-85 (EPR) - F45-2 (E2) Always Below 1 Ω
      F5-86 (PR) or F45-3 (PR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  5. REPLACE FUEL PRESSURE SENSOR


    1. Replace the fuel pressure sensor Click here.


    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

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

    6. Turn the GTS on.

    7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

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

    9. Read the pending DTCs.

      Result
      Result Proceed to
      DTC P0191 is output A
      DTCs are not output B

    B

    END

    A

  7. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0191) Click here

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the wire harness or connector.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0191) Click here

  9. REPLACE FUEL PRESSURE SENSOR


    1. Replace the fuel pressure sensor Click here.


    NEXT

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0191) Click here

  10. REPAIR OR REPLACE FUEL LEAK POINT


    1. Repair or replace the fuel leak point.


    NEXT

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

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

    6. Turn the GTS on.

    7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

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

    9. Read the pending DTCs.

      OK
      DTCs are not output

    NEXT

    END