ECD SYSTEM, Diagnostic DTC:P0191

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

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
P0191

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

WIRING DIAGRAM

A004TXIE95
*a Fuel Pressure Sensor

CAUTION / NOTICE / HINT

Note

When replacing the ECM and/or injector assembly, the ECM needs Registration and Initialization Click here.

Tech Tips


  • 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
      B104-2 (PCR1) - B91-101 (PC) Always Below 1 Ω
      B104-3 (VC1) - B91-54 (VCS) Always Below 1 Ω
      B104-1 (E1) - B91-102 (E2S) Always Below 1 Ω
      B104-2 (PCR1) or B91-101 (PC) - Body ground Always 10 kΩ or higher
      B104-3 (VC1) or B91-54 (VCS) - Body ground Always 10 kΩ or higher
      B104-1 (E1) or B91-102 (E2S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)


    1. A004RFBE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to fuel pressure sensor)

      Disconnect the fuel pressure sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B104-3 (VC1) - B104-1 (E1) Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE ECM Click here

    OK

  3. REPLACE FUEL PRESSURE SENSOR


    1. Replace the fuel pressure sensor Click here.


    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 Click here.

    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.

    8. Read the DTCs.

      Result
      Result Proceed to
      No DTC output A
      DTC P0191 B

    A

    END

    B

    REPLACE ECM Click here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPLACE ECM


    1. Replace the ECM Click here.


    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 Click here.

    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.

    8. Confirm that the DTC is not output again.


    NEXT

    END