ECD SYSTEM(w/ Urea SCR System), Diagnostic DTC:P0191

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

DESCRIPTION

Refer to DTC P0087.

Click here

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 (common rail assembly)

  • ECM

 Comes on DTC stored
Related Data List
DTC No. Data List
P0191

  • Common Rail Pressure

  • Target Common Rail Pressure

CONFIRMATION DRIVING PATTERN

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

WIRING DIAGRAM

Refer to DTC P0087.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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 (COMMON RAIL PRESSURE 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 / Data List / Common Rail Pressure and Target Common Rail Pressure.


      Powertrain > Engine > Data List
      Tester Display
      Target Common Rail Pressure
      Common Rail Pressure

    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

      Common Rail Pressure is always 10000 kPa or less

      or

      Common Rail Pressure is always 220000 kPa or higher

      		 A
      Except above B

      Tech Tips

      Normally, "Common Rail Pressure" is within 5000 kPa of "Target Common Rail Pressure".


    B

    GO TO STEP 4 Click here

    A

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


    1. Disconnect the fuel pressure sensor connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z2-5 (PR) - C59-18 (PCR1) Always Below 1 Ω
      Z2-2 (PR2) - C60-26 (PCR2) Always Below 1 Ω
      Z2-1 (VCS) - C60-33 (VCS) Always Below 1 Ω
      Z2-6 (VC) - C59-28 (VCM) Always Below 1 Ω
      Z2-4 (E2) - C59-19 (E2M) Always Below 1 Ω
      Z2-3 (E2S) - C60-25 (E2S) Always Below 1 Ω
      Z2-5 (PR) or C59-18 (PCR1) - Body ground and other terminals Always 10 kΩ or higher
      Z2-2 (PR2) or C60-26 (PCR2) - Body ground and other terminals Always 10 kΩ or higher
      Z2-1 (VCS) or C60-33 (VCS) - Body ground and other terminals Always 10 kΩ or higher
      Z2-6 (VC) or C59-28 (VCM) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 5 Click here

    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 > Clear DTCs

    4. Let the engine idle for 1 second or more.

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

    6. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P0191 is output A
      No DTC is output B

    B

    END

    A

  5. REPLACE COMMON RAIL ASSEMBLY


    1. Replace the common rail assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system.

      Click here

      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 > Clear DTCs

    4. Let the engine idle for 1 second or more.

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

    6. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P0191 is output A
      No DTC is output B

    B

    END

    A

  8. REPLACE ECM


    1. Replace the ECM.

      Click here

      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 > Clear DTCs

    4. Let the engine idle for 1 second or more.

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

    6. Confirm that the DTC is not output again.


      Powertrain > Engine > Trouble Codes
      Result
      Proceed to
      NEXT

    NEXT

    END