DTC    P0087/49    Fuel Rail / System Pressure - Too Low

DTC    P0190/49    Fuel Rail Pressure Sensor Circuit

DTC    P0192/49    Fuel Rail Pressure Sensor Circuit Low Input

DTC    P0193/49    Fuel Rail Pressure Sensor Circuit High Input

for Preparation Click here


DESCRIPTION

A084827E04

HINT:
  1. For more information on the fuel pressure sensor and common rail system, refer to the system description (Click here).
  2. If P0087/49, P0190/49, P0192/49 and/or P0193/49 is present, refer to the "Diagnostic Trouble Code (DTC) Table for Common Rail System" (Click here).

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 applying pressure to its silicon chip. This sensor outputs the voltage in proportion to the internal fuel pressure.

DTC No.
DTC Detection Condition
Trouble Area
P0087/49
Fuel pressure sensor output voltage stays at fixed value
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM
P0190/49
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)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM
P0192/49
Fuel pressure sensor output voltage is 0.55 V or less for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM
P0193/49
Fuel pressure sensor output voltage is 4.9 V or more for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM

HINT:
When DTC P0087/49, P0190/49, P0192/49 and/or P0193/49 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.

Engine Speed
Fuel Pressure
Idling
Approximately 25 to 35 MPa
3,000 rpm (No engine load)
Approximately 35 to 55 MPa


MONITOR DESCRIPTION

P0087/49 (Fuel pressure sensor output stays at fixed value):
  1. Under normal condition, 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 condition is constant. The internal fuel pressure is approximately 25 to 35 MPa (255 to 357 kgf/cm2, 3,626 to 5,076 psi) when idling, and it increases to approximately 35 to 55 MPa (357 to 562 kgf/cm2, 5,076 to 7,991 psi) when running the engine at 3,000 rpm. This DTC is set if there is no fluctuation in the internal 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.
P0190/49, P0192/49 and P0193/49 (Open or short in fuel pressure sensor circuit):

  1. 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.


    G037165E02


MONITOR STRATEGY


P0087/49: 
Required sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
1 second
MIL operation
1 driving cycle

P0190/49: 
Required sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

P0192/49: 
Required sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

P0193/49: 
Required sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

TYPICAL ENABLING CONDITIONS


P0087/49: 
Item
Specification
Minimum
Specification
Maximum
Engine speed
500 rpm
-
Battery voltage
8 V
-
Fuel volume
5 mm3
-
The monitor will not run if the fuel pressure sensor circuit (P0190/49, P0192/49 and P0193/49) is malfunctioning

TYPICAL MALFUNCTION THRESHOLDS


P0087/49: 
Detection Criteria
Threshold
Changing value of fuel pressure
Virtually no fluctuation

P0190/49: 
Detection Criteria
Threshold
Fuel pressure sensor output voltage
Less than 0.55 V or more than 4.9 V

P0192/49: 
Detection Criteria
Threshold
Fuel pressure sensor output voltage
Less than 0.55 V

P0193/49: 
Detection Criteria
Threshold
Fuel pressure sensor output voltage
More than 4.9 V

WIRING DIAGRAM


A099769E02


INSPECTION PROCEDURE

HINT:
  1. After completing repairs, check that P0087/49, P0190/49, P0192/49 and/or P0193/49 is not set again.
  2. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  3. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

NOTICE:
If the ECM is replaced, the new ECM needs initialization (Click here).


When using intelligent tester:

1.READ DATA LIST (FUEL PRESS)

  1. Connect the intelligent tester to the DLC3.

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

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

  1. Read the values.

    OK:
    The internal fuel pressure of the common rail is within the specification below.

    Standard:
    Engine Speed
    		Fuel Pressure
    Idling
    		Approximately 25 to 35 MPa
    3,000 rpm (No engine load)
    		Approximately 35 to 55 MPa



NG
Go to step 3
OK


2.CHECK IF DTC OUTPUT RECURS (FUEL PRESSURE SENSOR DTCS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine / DTC / Clear.

  1. Clear the DTC(s).

  1. Idle the engine for 60 seconds, and repeat quick engine RPM accelerations (to 2,500 rpm) for 30 seconds.

  1. Enter the following menus: Powertrain / Engine / DTC.

  1. Read the DTC(s).

    Result:
    Display (DTC Output)
    		Proceed to
    P0087/49, P0190/49, P0192/49 or P0193/49
    		A
    No output
    		B



B
CHECK FOR INTERMITTENT PROBLEMS
A

REPLACE ECM 

3.CHECK WIRE HARNESS (FUEL PRESSURE SENSOR - ECM)
A099798E05

  1. Disconnect the E8 ECM connector.

  1. Disconnect the F9 sensor connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-26 (PCR1) - F9-2 (PR)
    		Below 1 Ω
    E8-18 (VC) - F9-3 (VCC)
    		Below 1 Ω
    E8-28 (E2) - F9-1 (E2)
    		Below 1 Ω
    E8-26 (PCR1) or F9-2 (PR) - Body ground
    		10 kΩ or higher
    E8-18 (VC) or F9-3 (VC) - Body ground
    		10 kΩ or higher
    E8-28 (E2) or F9-1 (E2) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR) 


When not using intelligent tester:

1.CHECK ECM (PCR1 VOLTAGE)
A066060E30

  1. Start the engine.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E8-26 (PCR1) - E8-28 (E2)
    		Idling
    		1.3 to 1.8 V



NG
Go to step 2
OK

REPLACE ECM 

2.INSPECT COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)
A062213E05

  1. Disconnect the F9 sensor connector.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Specified Condition
    1 (E2) - 2 (PR)
    		16.4 kΩ or less
    2 (PR) - 3 (VC)
    		3 kΩ or less



NG
REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)
OK

CHECK WIRE HARNESS (FUEL PRESSURE SENSOR - ECM) 

3.CHECK WIRE HARNESS (FUEL PRESSURE SENSOR - ECM)
A099798E05

  1. Disconnect the E8 ECM connector.

  1. Disconnect the F9 sensor connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-26 (PCR1) - F9-2 (PR)
    		Below 1 Ω
    E8-18 (VC) - F9-3 (VC)
    		Below 1 Ω
    E8-28 (E2) - F9-1 (E2)
    		Below 1 Ω
    E8-26 (PCR1) or F9-2 (PR) - Body ground
    		10 kΩ or higher
    E8-18 (VC) or F9-3 (VC) - Body ground
    		10 kΩ or higher
    E8-28 (E2) or F9-1 (E2) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM