ECD SYSTEM, Diagnostic DTC:P0087, P0190, P0191, P0192, P0193

DTC Code DTC Name
P0087 Fuel Rail / System Pressure - Too Low
P0190 Fuel Rail Pressure Sensor Circuit
P0191 Fuel Rail Pressure Sensor Circuit Range / Performance
P0192 Fuel Rail Pressure Sensor Circuit Low Input
P0193 Fuel Rail Pressure Sensor Circuit High Input

DESCRIPTION

The fuel pressure sensor, mounted on the common rail, converts the fuel pressure into an electric signal and outputs the signal to the ECM. Based on the signal from the fuel pressure sensor, the ECM controls the injection (supply) pump (suction control valve) and keeps the internal fuel pressure of the common rail at the target fuel pressure.

DTC No. DTC Detection Condition Trouble Area
P0087

Conditions (a), (b) and (c) are met 10 times with engine speed 600 rpm or more:

(a) Battery voltage: 16 V or more

(b) Fuel quantify: 5 mm/st or more

(c) Amount of change in fuel pressure applied to common rail: 0.1 Mpa or less

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0190

Conditions (a) and (b) continue for 1 second or more:

(a) Ignition switch in the ON position

(b) Open or short in fuel pressure sensor circuit

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0191

Conditions (a) and (b) continue for 1 second or more:

(a) Ignition switch in the ON position

(b) Fuel pressure sensor out of range

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0192

Condition (a) continues for 1 second:

(a) Fuel pressure sensor output voltage is 0.55 V or less

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P0193

Condition (a) continues for 1 second:

(a) Fuel pressure sensor output voltage is 4.9 V or more

  • Open or short in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM

Tech Tips


  • If the vehicle runs out of fuel, the ECM determines the fuel pressure has decreased, and DTC P0192 may be output.

  • 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 and ECT / Data List / Fuel Press.

Engine Speed Fuel Pressure

Approx. 0 Mpa (0 kg/cm2, 0 psi) or more

  • Short in PCR and E2 terminal

  • Open in VC circuit

Approx. 190 Mpa (1,937 kg/cm2, 27,556 psi) or more

  • Short in PCR and VC circuit

  • Open in PCR circuit

  • Open in E2 circuit

WIRING DIAGRAM

A01CJG5E01

INSPECTION PROCEDURE

Note

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

Tech Tips


  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  • If different DTCs that are related to a different system are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.

PROCEDURE


  1. INSPECT ECM (OUTPUT VOLTAGE)


    1. A01CGXCE08

      Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E22-18 (VC) - E22-28 (E2) Ignition switch to the ON position 4.5 to 5.5 V

    NG

    CHECK ECM POWER SOURCE CIRCUIT

    OK

  2. INSPECT ECM (PCR VOLTAGE)


    1. A01CGXCE09

      Start the engine.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) - E22-28 (E2) Idling 1.7 to 2.2 V
      E22-33 (PCR2) - E22-28 (E2) Idling 1.2 to 1.6 V

    NG

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

    OK

    REPLACE ECM

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


    1. A01CGR7E01

      Disconnect the ECM connector.

    2. Disconnect the fuel pressure sensor connector.

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

      Standard resistance
      Check for open
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) - F8-5 (PFUEL) Always Below 1 Ω
      E22-33 (PCR2) - F8-2 (PFUEL) Always Below 1 Ω
      E22-18 (VC) - F8-6 (A-VCC) Always Below 1 Ω
      E22-18 (VC) - F8-1 (A-VCC) Always Below 1 Ω
      E22-28 (E2) - F8-4 (A-GND) Always Below 1 Ω
      E22-28 (E2) - F8-3 (A-GND) Always Below 1 Ω
      Check for short
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) or F8-5 (PFUEL) - Body ground Always 10 kΩ or higher
      E22-33 (PCR2) or F8-2 (PFUEL) - Body ground Always 10 kΩ or higher
      E22-18 (VC) or F8-6 (A-VCC) - Body ground Always 10 kΩ or higher
      E22-18 (VC) or F8-1 (A-VCC) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL PRESSURE SENSOR)

    OK

    REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)