ECD SYSTEM (w/o EGR Cooler), 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 conditions. Even if either of the sensor circuits fail, the other normal circuit will be used to monitor the internal fuel pressure.

A01DZE7E07
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 and ECT / Data List / Fuel Press.

    Reference
    Engine Speed Fuel Pressure
    Idling Approximately 25000 to 35000 kPa
    3000 rpm (No engine load) Approximately 28000 to 48000 kPa

MONITOR DESCRIPTION

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

Under normal conditions, the internal fuel pressure of the common rail usually fluctuates 1000 to 2000 kPa (10 to 20 kgf/cm2, 145 to 290 psi) even when the driving conditions are constant. The internal fuel pressure is approximately 25000 to 35000 kPa (255 to 357 kgf/cm2, 3626 to 5076 psi) when idling, and it increases to approximately 28000 to 48000 kPa (286 to 489 kgf/cm2, 4060 to 6960 psi) when running the engine at 3000 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 OFF.

A01DWMNE01
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 OFF.

MONITOR STRATEGY

P0087:
Required Sensors Fuel pressure sensor
Frequency of operation Continuous
Duration 1 second
MIL operation 1 driving cycle
P0190:
Required Sensors Fuel pressure sensor
Frequency of operation Continuous
Duration 0.5 seconds
MIL operation 1 driving cycle
P0192:
Required Sensors Fuel pressure sensor
Frequency of operation Continuous
Duration 0.5 seconds
MIL operation 1 driving cycle
P0193:
Required Sensors Fuel pressure sensor
Frequency of operation Continuous
Duration 0.5 seconds
MIL operation 1 driving cycle

TYPICAL ENABLING CONDITIONS

P0087:
Item Specification Specification
Minimum Maximum
Engine speed 500 rpm -
Battery voltage 8 V -
Fuel volume

5 mm3

-
The monitor will not run if the fuel pressure sensor circuit (P0190, P0192 and P0193) is malfunctioning.

TYPICAL MALFUNCTION THRESHOLDS

P0087:
Detection Criteria Threshold
Changing value of fuel pressure Virtually no fluctuation
P0190:
Detection Criteria Threshold
Fuel pressure sensor output voltage Less than 0.55 V or more than 4.9 V
P0192:
Detection Criteria Threshold
Fuel pressure sensor output voltage Less than 0.55 V
P0193:
Detection Criteria Threshold
Fuel pressure sensor output voltage More than 4.9 V

WIRING DIAGRAM

A01E2S0E15

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 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, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (FUEL PRESS)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the intelligent tester ON.

    3. Enter the following menus: Powertrain / Engine and ECT / 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 25000 to 35000 kPa
      3000 rpm (No engine load) Approximately 28000 to 48000 kPa

    NG

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

    OK

  2. CHECK IF DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

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

    3. Enter the following menus: Powertrain / Engine and ECT / DTC.

    4. Clear the DTC(s).

    5. Let the engine idle for 60 seconds, and then repeat quick engine RPM accelerations (to 2500 rpm) for 30 seconds.

    6. Enter the following menus: Powertrain / Engine and ECT / DTC.

    7. 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 Click here

    A

    REPLACE ECM Click here

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


    1. A01DW38E17

      Disconnect the E7 and E8 ECM connectors.

    2. Disconnect the F9 fuel pressure sensor connector.

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

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      PCR1 (E8-26) - PR (F9-5) Below 1 Ω
      PCR2 (E8-33) - PR2 (F9-2) Below 1 Ω
      VCS (E7-2) - VCS (F9-1) Below 1 Ω
      VC (E8-18) - VC (F9-6) Below 1 Ω
      E2 (E8-28) - E2 (F9-4) Below 1 Ω
      E2S (E7-1) - E2S (F9-3) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      PCR1 (E8-26) or PR (F9-5) - Body ground 10 kΩ or higher
      PCR2 (E8-33) or PR2 (F9-2) - Body ground 10 kΩ or higher
      VCS (E7-2) or VCS (F9-1) - Body ground 10 kΩ or higher
      VC (E8-18) or VC (F9-6) - Body ground 10 kΩ or higher
      E2 (E8-28) or E2 (F9-4) - Body ground 10 kΩ or higher
      E2S (E7-1) or E2S (F9-3) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR) Click here