ECD SYSTEM(for Swirl Control Valve), 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

A165731E84

CAUTION / NOTICE / HINT

Note:

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

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

      C99-2 (PCR1) - C112-101 (PC)

      Always

      Below 1 Ω

      C99-3 (VC1) - C112-54 (VCS)

      Always

      Below 1 Ω

      C99-1 (E1) - C112-102 (E2S)

      Always

      Below 1 Ω

      C99-2 (PCR1) or C112-101 (PC) - Body ground

      Always

      10 kΩ or higher

      C99-3 (VC1) or C112-54 (VCS) - Body ground

      Always

      10 kΩ or higher

      C99-1 (E1) or C112-102 (E2S) - Body ground

      Always

      10 kΩ or higher

    REPAIR OR REPLACE HARNESS OR CONNECTORClick here

  2. CHECK HARNESS AND CONNECTOR (VC VOLTAGE)

    U122327E02

    1. 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

      C99-3 (VC1) - C99-1 (E1)

      Ignition switch ON

      4.5 to 5.5 V
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to fuel pressure sensor)

    REPLACE ECMClick here

  3. REPLACE FUEL PRESSURE SENSOR

    1. Replace the fuel pressure sensor (Click here).

  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.

      Table 2. Result

      Result

      Proceed to

      No DTC output

      A

      DTC P0191

      B

    END

    REPLACE ECMClick here

  5. REPAIR OR REPLACE HARNESS OR CONNECTOR

    1. Repair or replace the harness or connector.

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

  6. REPLACE ECM

    1. Replace the ECM (Click here).

  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.

    END