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.

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.

Standard

Engine Speed	Fuel Pressure
Idling	Approximately 30 to 40 MPa
3,000 rpm (No engine load)	Approximately 85 to 105 MPa

MONITOR DESCRIPTION

P0087 (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 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 the engine power. The fail-safe mode continues until the ignition switch is turned OFF.

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.

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, P0190, P0192 and/or P0193 is not set again.
If DTCs relating to different systems are output, and they share terminal E2 as their ground, check this ground circuit first.

PROCEDURE

READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE SENSOR)

Connect the intelligent tester to the DLC3.
Start the engine and turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / Data List / Fuel Press.

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 85 to 105 MPa

NG

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

OK

CHECK WHETHER DTC OUTPUT RECURS

Connect the intelligent tester to the DLC3.
Turn the engine switch ON and turn the tester ON.
Select the following menu items: Powertrain / Engine and ECT / DTC / Clear.
Clear the DTC Click here.
Let the engine idle for 60 seconds, and then repeat quick engine RPM accelerations (to 2,500 rpm) for 30 seconds.
Select the following menu items: Powertrain / Engine and ECT / DTC.

Read the DTC(s).

Result

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

B

CHECK FOR INTERMITTENT PROBLEMS

A

REPLACE ECM

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Text in Illustration
*a	Wire Harness Side
*b	ECM Connector (Front View)
*c	Fuel Pressure Sensor Connector (Front View)

Disconnect the E5 and E6 ECM connectors.

Disconnect the F16 fuel pressure sensor connector.

Check the resistance.

Standard resistance (Check for open)

Tester Connection	Specified Condition
E6-26 (PCR1) - F16-5 (PR)	Below 1 Ω
E6-33 (PCR2) - F16-2 (PR2)	Below 1 Ω
E6-18 (VC) - F16-6 (VC)	Below 1 Ω
E5-2 (VCS) - F16-1 (VCS)	Below 1 Ω
E6-28 (E2) - F16-4 (E2)	Below 1 Ω
E5-1 (E2S) - F16-3 (E2S)	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Specified Condition
E6-26 (PCR1) or F16-5 (PR) - Body ground	10 kΩ or higher
E6-33 (PCR2) or F16-2 (PR2)- Body ground	10 kΩ or higher
E6-18 (VC) or F16-6 (VC) - Body ground	10 kΩ or higher
E5-2 (VCS) or F16-1 (VCS) - Body ground	10 kΩ or higher
E6-28 (E2) - F16-4 (E2) - Body ground	10 kΩ or higher
E5-1 (E2S) - F16-3 (E2S) - Body ground	10 kΩ or higher

Reconnect the ECM connectors.
Reconnect the fuel pressure sensor connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE COMMON RAIL ASSEMBLY

ECD SYSTEM (w/o EGR Cooler Bypass Valve), Diagnostic DTC:P0087, P0190, P0192, P0193