GSIC - Global Service Information Center

### 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

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 30 to 40 MPa
3,000 rpm (No engine load) | Approximately 50 to 70 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 30 to 40 MPa (306 to 408 kgf/cm2, 4,351 to 5,801 psi) when idling, and it increases to approximately 50 to 70 MPa 510 to 714 kgf/cm2, 7,252 to 10,153 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.

## 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 | -

## 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

## 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 30 to 40 MPa
     3,000 rpm (No engine load) | Approximately 50 to 70 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)

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 COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

## When not using intelligent tester:

1.CHECK ECM (PCR1 VOLTAGE)

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)

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)

1. Disconnect the E8 ECM connectors.

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