ECD SYSTEM, Diagnostic DTC:P0191

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

DESCRIPTION

Refer to DTC P0192.

Click here

For information on the fuel system, refer to System Description.

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DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0191

Fuel Rail Pressure Sensor "A" Circuit Range/Performance

Either condition is met (3 trip detection logic):

  • Fuel pressure sensor feedback value exceeds upper limit for 0.1 seconds.

  • Fuel pressure sensor feedback value falls below lower limit for 0.1 seconds.

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM

Comes on

DTC stored

WIRING DIAGRAM

Refer to DTC P0192.

Click here

CAUTION / NOTICE / HINT

Note:

When replacing the ECM and/or injector assembly, the ECM needs registration and initialization.

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Tip:

  • When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.

  • 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. 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

      B124-2 (PCR1) - B112-101 (PC)

      Always

      Below 1 Ω

      B124-3 (VC1) - B112-54 (VCS)

      Always

      Below 1 Ω

      B124-1 (E1) - B112-102 (E2S)

      Always

      Below 1 Ω

      B124-2 (PCR1) or B112-101 (PC) - Body ground

      Always

      10 kΩ or higher

      B124-3 (VC1) or B112-54 (VCS) - Body ground

      Always

      10 kΩ or higher

      B124-1 (E1) or B112-102 (E2S) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)

    A351160C07

    *a

    Front view of wire harness connector

    (to Fuel Pressure Sensor)

    1. Disconnect the fuel pressure sensor connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      B124-3 (VC1) - B124-1 (E1)

      Ignition switch ON

      4.5 to 5.5 V

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ECMClick here

    OK

  3. REPLACE FUEL PRESSURE SENSOR

    1. Replace the fuel pressure sensor.

      Click here

    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. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Read the DTCs.

    Result

    Result

    Proceed to

    No DTC output

    A

    DTC P0191

    B
    A

    END

    B

    REPLACE ECMClick here

  5. REPLACE ECM

    1. Replace the ECM.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    Result

    Proceed to

    NEXT
    NEXT

  7. 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. Turn the ignition switch off and wait for 60 seconds or more [A].

    5. Perform road test [B].

    6. Repeat [A] and [B] for the number of trips detected.

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

      Powertrain > Engine and ECT > Trouble Codes

    8. Confirm that the DTC is not output again.

    Result

    Proceed to

    NEXT
    NEXT

    END