P0087/49, P0190/49, P0192/49, P0193/49

DTC Code	DTC Name
P0087/49	Fuel Rail / System Pressure - Too Low
P0190/49	Fuel Rail Pressure Sensor Circuit
P0192/49	Fuel Rail Pressure Sensor Circuit Low Input
P0193/49	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 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)	Open or short in fuel pressure sensor circuit Fuel pressure sensor 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)	Open or short in fuel pressure sensor circuit Fuel pressure sensor ECM
P0192/49	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
P0193/49	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.
If P0087/49, P0190/49, P0192/49 and/or P0193/49 is present, refer to the "Diagnostics Trouble Codes (DTCs) Table for Common Rail System" Click here.
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) :

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) :

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 second
MIL operation	1 driving cycle

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

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

TYPICAL ENABLING CONDITIONS

P0087/49:
Item	Specification (Minimum)
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

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 P0087/49, P0190/49, P0192/49 and/or P0193/49 is not set again.
If 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. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

When using intelligent tester:

PROCEDURE

READ VALUE USING FUEL PRESSURE SENSOR

Connect the intelligent tester to the DLC3.
Start the engine and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

Read the values.

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

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

NG

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

OK

CHECK IF DTC OUTPUT RECURS

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the intelligent tester ON.
Enter the following menus: Powertrain / Engine / DTC / Clear.
Clear the DTC(s).
Let the engine idle for 60 seconds, and repeat quick engine RPM accelerations (to 2,500 rpm) for 30 seconds.
Enter the following menus: Powertrain / Engine / DTC.

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

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the D1 ECM connector.
Disconnect the D45 sensor connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

Tester Connection	Specified Condition
D1-26 (PCR1) - D45-2 (PR)	Below 1 Ω
D1-18 (VC) - D45-3 (VC)	Below 1 Ω
D1-28 (E2) - D45-1 (E2)	Below 1 Ω
D1-26 (PCR1) or D45-2 (PR) - Body ground	10 kΩ or higher
D1-18 (VC) or D45-3 (VC) - Body ground	10 kΩ or higher
D1-28 (E2) or D45-1 (E2) - Body ground	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE COMMON RAIL ASSEMBLY

When not using intelligent tester:

PROCEDURE

CHECK ECM TERMINAL VOLTAGE (PCR1 AND E2 TERMINALS)

Start the engine.

Measure the voltage of the ECM connector.

Standard voltage

Tester Connection	Condition	Specified Condition
D1-26 (PCR1) - D1-28 (E2)	Idling	1.3 to 1.8 V

NG

CHECK COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR) Click here

OK

REPLACE ECM

CHECK COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

Disconnect the D45 sensor connector.

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

OK

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

Disconnect the D1 ECM connector.
Disconnect the D45 sensor connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

Tester Connection	Specified Condition
D1-26 (PCR1) - D45-2 (PR)	Below 1 Ω
D1-18 (VC) - D45-3 (VC)	Below 1 Ω
D1-28 (E2) - D45-1 (E2)	Below 1 Ω
D1-26 (PCR1) or D45-2 (PR) - Body ground	10 kΩ or higher
D1-18 (VC) or D45-3 (VC) - Body ground	10 kΩ or higher
D1-28 (E2) or D45-1 (E2) - Body ground	10 kΩ or higher

Note

After replacing the ECM, the new ECM needs initialization Click here

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

REPLACE ECM

ECD SYSTEM, Diagnostic DTC:P0087/49, P0190/49, P0192/49, P0193/49