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 to 132.6 kgf/cm2, 580 to 1885 psi). If the sensor output stops, the ECM will stop the fuel pump for high pressure and supply fuel using the low pressure side fuel pump.

A01GKDXE02
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

  • 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

  • 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

  • Fuel pressure sensor

  • ECM

Tech Tips

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

Fuel Pressure (MPa) Malfunction
Approximately 0

  • PR, E2 circuit short

  • VC circuit open
19.6 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 indicate 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.

WIRING DIAGRAM

A01GMZME09

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester ON.

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

    5. Read the values.

      Pressure
      4000 to 13000 kPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi).
      Result:
      Fuel Pressure (kPa) Proceed to
      19600 or more A
      Approximately 0 B

      OK [4000 to 13000 kPa (40.8 to 132.6 kgf/cm2, 580 to 1885 psi)] *

      		 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 ECM (VC VOLTAGE)


    1. A01GLDFE01

      Disconnect the H17 fuel pressure sensor connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage between the terminals of the fuel pressure sensor connector.

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      H17-1 (VC) - H17-3 (E2) Engine switch on (IG) 4.5 to 5.5 V

    NG

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


    1. A01GJS7E01

      Disconnect the H17 fuel pressure sensor connector.

    2. Disconnect the E1 and E3 ECM connectors.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      H17-1 (VC) - E1-18 (VC) Always Below 1 Ω
      H17-2 (PR) - E3-27 (PR) Always Below 1 Ω
      H17-3 (E2) - E1-28 (E2) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      H17-1 (VC) or E1-18 (VC) - Body ground Always 10 kΩ or higher
      H17-2 (PR) or E3-27 (PR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here