ECD 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 (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 here

CAUTION / NOTICE / HINT

Note:

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

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 > 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

    CHECK WHETHER DTC OUTPUT RECURS (DTC P0191)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

      B70-5 (PR) - B76-66 (PCR1)

      Always

      Below 1 Ω

      B70-2 (PR2) - B76-114 (PCR2)

      Always

      Below 1 Ω

      B70-1 (VCS) - B76-69 (VCS)

      Always

      Below 1 Ω

      B70-6 (VC) - B76-68 (VCM)

      Always

      Below 1 Ω

      B70-4 (E2) - B76-67 (E2M)

      Always

      Below 1 Ω

      B70-3 (E2S) - B76-91 (E2S)

      Always

      Below 1 Ω

      B70-5 (PR) or B76-66 (PCR1) - Body ground

      Always

      10 kΩ or higher

      B70-2 (PR2) or B76-114 (PCR2) - Body ground

      Always

      10 kΩ or higher

      B70-1 (VCS) or B76-69 (VCS) - Body ground

      Always

      10 kΩ or higher

      B70-6 (VC) or B76-68 (VCM) - Body ground

      Always

      10 kΩ or higher

      B70-4 (E2) or B76-67 (E2M) - Body ground

      Always

      10 kΩ or higher

      B70-3 (E2S) or B76-91 (E2S) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE COMMON RAIL ASSEMBLYClick 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.

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

    6. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P0191 is output

      A

      DTC is not 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.

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

    6. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P0191 is output

      A

      DTC is not 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.

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

    6. Confirm that the DTC is not output.

      Powertrain > Engine > Trouble Codes

    Result

    Proceed to

    NEXT
    NEXT

    END