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 assembly 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 assembly by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.

Standard
Engine Speed	Fuel Pressure
Idling	Approximately 30,000 to 40,000 kPa
3,000 rpm (No engine load)	Approximately 45,000 to 90,000 kPa

MONITOR DESCRIPTION

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

Under normal condition, the internal fuel pressure of the common rail assembly 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 30,000 to 40,000 kPa (306 to 408 kgf/cm², 4,351 to 5,801 psi) when idling, and it increases to approximately 45,000 to 90,000 kPa (459 to 918 kgf/cm², 6,526 to 13,053 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 menus: Powertrain / Engine and ECT / Data List / Fuel Press.

Read values.

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

Standard
Engine Speed	Fuel Pressure
Idling	Approximately 30,000 to 40,000 kPa
3,000 rpm (No engine load)	Approximately 45,000 to 90,000 kPa

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 ignition switch to ON and turn the tester on.
Select the following menus: Powertrain / Engine and ECT / DTC / Clear.
Clear DTCs. 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 menus: Powertrain / Engine and ECT / DTC.

Read DTCs.

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

B

CHECK FOR INTERMITTENT PROBLEMS Click here

A

REPLACE ECM Click here

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Disconnect the E12 and E13 ECM connectors.
Disconnect the F16 fuel pressure sensor connector.

Check the resistance.

Standard resistance (Check for open)

Tester Connection	Specified Condition
E13-16 (PCR1) - F16-5 (PR)	Below 1 Ω
E13-2 (PCR2) - F16-2 (PR2)	Below 1 Ω
E12-13 (VC) - F16-6 (VC)	Below 1 Ω
E13-13 (VCS) - F16-1 (VCS)	Below 1 Ω
E12-14 (E2) - F16-4 (E2)	Below 1 Ω
E13-8 (E2S) - F16-3 (E2S)	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Specified Condition
E13-16 (PCR1) or F16-5 (PR) - Body ground	10 kΩ or higher
E13-2 (PCR2) or F16-2 (PR2) - Body ground	10 kΩ or higher
E12-13 (VC) or F16-6 (VC) - Body ground	10 kΩ or higher
E13-13 (VCS) or F16-1 (VCS) - Body ground	10 kΩ or higher
E12-14 (E2) - F16-4 (E2) - Body ground	10 kΩ or higher
E13-8 (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 Click here

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