ECD SYSTEM (w/o DPF), Diagnostic DTC:P0087, P0190, P0192, P0193

DTC Code DTC Name
P0087 Fuel Rail / System Pressure - Too Low
P0190 Fuel Rail Pressure Sensor Circuit
P0192 Fuel Rail Pressure Sensor Circuit Low Input
P0193 Fuel Rail Pressure Sensor Circuit High Input

DESCRIPTION

The ECM monitors the internal fuel pressure of the common rail using the fuel pressure sensor, and controls the suction control valve to regulate the internal pressure to the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip. This sensor outputs the voltage in proportion to the internal fuel pressure. The sensor has been designed as a duplicate circuit, and its main (PR) circuit is used under normal condition. Even if either of the sensor circuit is failed, the other normal circuit will be used to monitor the internal fuel pressure.

A01BCEHE03
DTC No. DTC Detection Condition Trouble Area
P0087

Fuel pressure sensor output voltage stays at fixed value

(1 trip detection logic)

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0190

Fuel pressure sensor output voltage is 0.55 V or less, or 4.9 V or more for 0.5 seconds

(1 trip detection logic)

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0192

Fuel pressure sensor output voltage is 0.55 V or less for 0.5 seconds

(1 trip detection logic)

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0193

Fuel pressure sensor output voltage is 4.9 V or more for 0.5 seconds

(1 trip detection logic)

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM

Tech Tips


  • For more information on the fuel pressure sensor and common rail system, refer to the system description Click here.

  • When DTC P0087, P0190, P0192 and/or P0193 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine / Data List / Fuel Press.

    Reference
    Engine Speed Fuel Pressure
    Idling Approximately 30 to 40 MPa
    3,000 rpm (No engine load) Approximately 85 to 105 MPa

MONITOR DESCRIPTION

P0087 (Fuel pressure sensor output stays at fixed value):

Under normal conditions, the internal fuel pressure of the common rail usually fluctuates 1 to 2 MPa (10 to 20 kgf/cm2, 145 to 290 psi) even when the driving conditions are constant. The internal fuel pressure is approximately 30 to 40 MPa (306 to 408 kgf/cm2, 4,351 to 5,801 psi) when idling, and it increases to approximately 85 to 105 MPa (866 to 1,070 kgf/cm2, 12,328 to 15,228 psi) when running the engine at 3,000 rpm. This DTC is set if there is no fluctuation of the fuel pressure.

If this DTC is set, the ECM enters fail-safe mode and limits engine power. The fail-safe mode continues until the ignition switch is turned to OFF.

A01BHVRE01
P0190, P0192 and P0193 (Open or short in fuel pressure sensor circuit):

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range and an open or short malfunction of the sensor circuit has occurred.

If these DTCs are set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned to OFF.

WIRING DIAGRAM

A01BGG1E02

INSPECTION PROCEDURE

Note

After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

Tech Tips


  • After completing repairs, check that P0087, P0190, P0192 and/or P0193 is not set again.

  • If different DTCs related 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 an intelligent tester. Freeze frame data record 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 PRESS)


    1. Connect an intelligent tester to the DLC3.

    2. Start the engine and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / Data List / Fuel Press.

    4. Read the values.

      OK
      The internal fuel pressure of the common rail is within the specification below.
      Result
      Engine Speed Fuel Pressure
      Idling Approximately 30 to 40 MPa
      3,000 rpm (No engine load) Approximately 85 to 105 MPa

    NG

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

    OK

  2. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / DTC / Clear.

    4. Clear DTCs.

    5. Start the engine.

    6. Allow the engine to idle for 60 seconds.

    7. Accelerate the engine quickly from idling to 3,000 rpm or more at least 3 times.

    8. Select the following menu items: Powertrain / Engine / DTC.

    9. Read the DTC(s).

      Result
      Display (DTC Output) Proceed To
      P0087, P0190, P0192 and/or P0193 A
      No output B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

    REPLACE ECM

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


    1. A01BADSE03

      Disconnect the D1 and D3 ECM connector.

    2. Disconnect the D69 fuel pressure sensor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      PCR1 (D1-26) - PR (D69-5) Below 1 Ω
      PCR2 (D1-33) - PR2 (D69-2) Below 1 Ω
      VCS (D3-2) - VCS (D69-1) Below 1 Ω
      VC (D1-18) - VC (D69-6) Below 1 Ω
      E2 (D1-28) - E2 (D69-4) Below 1 Ω
      E2S (D3-1) - E2S (D69-3) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      PCR1 (D1-26) or PR (D69-5) - Body ground 10 kΩ or higher
      PCR2 (D1-33) or PR2 (D69-2) - Body ground 10 kΩ or higher
      VCS (D3-2) or VCS (D69-1) - Body ground 10 kΩ or higher
      VC (D1-18) or VC (D69-6) - Body ground 10 kΩ or higher
      E2 (D1-28) or E2 (D69-4) - Body ground 10 kΩ or higher
      E2S (D3-1) or E2S (D69-3) - Body ground 10 kΩ or higher

    4. Reconnect the fuel pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)