SFI SYSTEM(w/ Canister Pump Module), 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 MIL Memory
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance

Either of the 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 delivery pipe LH (fuel pressure sensor)

  • Open or short in fuel pressure sensor circuit

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION



MONITOR STRATEGY

Required Sensors/Components Fuel delivery pipe LH (fuel pressure sensor)
Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

B000YDQE03

  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).

  7. Turn the GTS on [A].

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

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

    Note

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

  10. Turn the engine switch off.

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

  12. Turn the engine switch on (IG).

  13. Turn the GTS on [E].

  14. Enter the following menus: Powertrain / Engine / Trouble Codes [F].

  15. 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.

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

  17. Input the DTC: P0191.

  18. 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 engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine > Trouble Codes

    5. Read the DTCs.

      Result
      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.

      • If any DTCs other than P0191 are output, troubleshoot those DTCs 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.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE FUEL LEAK POINT Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (CONTROL THE TARGET FUEL PRESSURE)


    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 / Active Test / Control the Target Fuel Pressure / Fuel System / High Fuel Pressure Sensor.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Target Fuel Pressure
      Data List Display
      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 DELIVERY PIPE LH (FUEL PRESSURE SENSOR) Click here

    A

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


    1. Disconnect the ECM connector.

    2. Disconnect the fuel delivery pipe LH (fuel pressure sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G42-96 (PR) - J5-3 (PR) Always Below 1 Ω
      G42-127 (EPR) - J5-2 (E2) Always Below 1 Ω
      G42-96 (PR) or J5-3 (PR) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  5. REPLACE FUEL DELIVERY PIPE LH (FUEL PRESSURE SENSOR)


    1. Replace the fuel delivery pipe LH (fuel pressure sensor).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)


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

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

    3. Read the pending DTCs.

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

    B

    END

    A

  8. REPLACE ECM


    1. Replace the ECM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  9. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  10. REPLACE FUEL DELIVERY PIPE LH (FUEL PRESSURE SENSOR)


    1. Replace the fuel delivery pipe sub-assembly (fuel pressure sensor).

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 12 Click here

  11. REPAIR OR REPLACE FUEL LEAK POINT


    1. Repair or replace the fuel leak point.

      Result
      Proceed to
      NEXT

    NEXT

  12. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

      Result
      Proceed to
      NEXT

    NEXT

  13. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)


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

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.


      Powertrain > Engine > Trouble Codes

    3. Read the pending DTCs.

      OK
      DTCs are not output
      Result
      Proceed to
      NEXT

    NEXT

    END