SFI SYSTEM, Diagnostic DTC:P0190, P0192, P0193

DTC Code DTC Name
P0190 Fuel Rail Pressure Sensor Circuit
P0192 Fuel Rail Pressure Sensor Circuit Low Input
P0193 Fuel Rail Pressure Sensor Circuit High Input

DESCRIPTION

The fuel pressure sensor is installed on the delivery pipe. The sensor changes fuel pressure to an electrical signal and sends the signal to the ECM. Then the ECM controls the feedback of the pump discharge to maintain the fuel's target pressure between 4 and 13 MPa (40.8 and 132.6 kgf/cm2, 580 and 1886 psi). If the sensor output stops, the ECM will stop the high pressure side fuel pump and supply fuel using the low pressure side fuel pump.

A01FHT3E03
DTC No. DTC Detection Condition Trouble Area
P0190

Open or short in fuel pressure sensor circuit for 5 seconds or more

(1 trip detection logic)

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0192

Short in fuel pressure sensor circuit for 5 seconds or more

(1 trip detection logic)

  • Short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0193

Open in fuel pressure sensor circuit for 5 seconds or more

(1 trip detection logic)

  • Open in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM

Tech Tips

After confirming DTC P0190, use the GTS to confirm the fuel pressure in the delivery pipe by entering the following menus: Powertrain / Engine and ECT / Data List / Fuel Press.

Fuel Pressure (kPa) Malfunction
Approximately 0

  • PR circuit and ground circuit short

  • E2 circuit and PR circuit short
19600 or more

  • PR, VC circuit short

  • PR circuit open

  • E2 circuit open

MONITOR DESCRIPTION

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand for an open or short malfunction of the sensor circuit.

If these DTCs are set, the ECM enters fail-safe mode and limits the engine power. Fail-safe mode continues until the engine switch is turned off.

MONITOR STRATEGY

Required Sensors/Components Fuel Rail Pressure Sensor
Frequency of Operation Continuous

TYPICAL MALFUNCTION THRESHOLDS

P0190
Fuel rail pressure sensor voltage Less than 0.25 V, or more than 4.5 V
P0192
Fuel rail pressure sensor voltage Less than 0.25 V
P0193
Fuel rail pressure sensor voltage More than 4.5 V

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Click here.

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Wait 3 seconds or more.

  7. Start the engine.

  8. Idle the engine for 10 seconds [A].

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].

  10. Read Pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P0190, P0192 or P0193.

  13. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [A] and [B] again.

WIRING DIAGRAM

A01FDBUE01

INSPECTION PROCEDURE

Tech Tips


  • If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (FUEL PRESSURE)


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press.

    5. Read the values.

      OK
      4000 to 7000 kPa (40.8 to 71.4 kgf/cm2, 580 to 1015 psi)
      Result
      Fuel Pressure (kPa) Proceed to
      19600 or more A
      0.0 B
      (4000 to 7000)* C

      Tech Tips

      *: The value must change when the engine is running or stopped.


    B

    INSPECT FUEL PRESSURE SENSOR Click here

    C

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  2. INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)


    1. A01FELTE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Pressure Sensor)

      Disconnect the fuel pressure sensor connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F44-3 (VC) - Body ground Engine switch on (IG) 4.5 to 5.5 V

    4. Reconnect the fuel pressure sensor connector.


    NG

    CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR) Click here

    OK

  3. INSPECT FUEL PRESSURE SENSOR


    1. Inspect the fuel pressure sensor Click here.


    NG

    REPLACE FUEL PRESSURE SENSOR Click here

    OK

  4. INSPECT ECM (PR VOLTAGE)


    1. A01FE6PE31
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      Start the engine.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F4-27 (PR) - F1-28 (E2) Idling with warm engine 1.2 to 3.3 V

      Tech Tips

      The fuel pressure in the delivery pipe is 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1886 psi).


    NG

    CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR) Click here

    OK

    REPLACE ECM Click here

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


    1. Disconnect the ECM connectors.

    2. Disconnect the fuel pressure sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F1-18 (VC) - F44-3 (VC) Always Below 1 Ω
      F4-27 (PR) - F44-2 (PR) Always Below 1 Ω
      F1-28 (E2) - F44-1 (E2) Always Below 1 Ω
      F1-18 (VC) or F44-3 (VC) - Body ground Always 10 kΩ or higher
      F4-27 (PR) or F44-2 (PR) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connectors.

    5. Reconnect the fuel pressure sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FUEL PRESSURE SENSOR Click here

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


    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
      F1-18 (VC) or F44-3 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the fuel pressure sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here