ECD SYSTEM(for DPF), Diagnostic DTC: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.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0087	Fuel Rail / System Pressure - Too Low	Fuel pressure sensor output voltage stays at fixed value for 90 seconds. (1 trip detection logic)	Open or short in fuel pressure sensor circuit Fuel pressure sensor (common rail assembly) Ran out of fuel Fuel frozen ECM	Comes on	DTC stored
P0190	Fuel Rail Pressure Sensor Circuit	Fuel pressure sensor output voltage is 0.55 V or less, or 4.9 V or higher for 0.5 seconds. (1 trip detection logic)	Open or short in fuel pressure sensor circuit Fuel pressure sensor (common rail assembly) ECM HINT: Trouble areas are related to the electrical system only (pumps are not involved)	Comes on	DTC stored
P0192	Fuel Rail Pressure Sensor Circuit Low Input	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 (common rail assembly) ECM HINT: Trouble areas are related to the electrical system only (pumps are not involved)	Comes on	DTC stored
P0193	Fuel Rail Pressure Sensor Circuit High Input	Fuel pressure sensor output voltage is 4.9 Vor higher for 0.5 seconds. (1 trip detection logic)	Open or short in fuel pressure sensor circuit Fuel pressure sensor (common rail assembly) ECM HINT: Trouble areas are related to the electrical system only (pumps are not involved)	Comes on	DTC stored

Related Data List
DTC No.	Data List
P0087	Fuel Press Target Common Rail Pressure
P0190
P0192
P0193

Tech Tips

Check Fuel Press compared to Target Common Rail Pressure in the Data List by entering the following menus: Powertrain / Engine and ECT / Data List / Fuel Press, Target Common Rail Pressure. Under stable conditions, the difference between Fuel Press and Target Common Rail Pressure is within +/-5000 kPa.
For more information on the fuel pressure sensor and common rail system, refer to the System Description Click here.
If DTC P0087 is stored, the following symptoms may appear:

Black smoke
Poor drivability
Lack of power
Lack of power due to accelerator restriction of fail-safe function

If DTC P0190, P0192 and/or P0193 is stored, the following symptoms may appear.

Lack of power due to accelerator restriction of fail-safe function

If DTC P0190, P0192 and/or P0193 is stored, "Fuel Press" always displays 0 kPa or 200000 kPa.

MONITOR DESCRIPTION

P0087 (Fuel pressure sensor output stays at fixed value):
- Under normal conditions, the internal fuel pressure of the common rail usually fluctuates 1000 to 2000 kPa (10 to 20 kgf/cm², 145 to 290 psi) even when the driving conditions are constant. This DTC is stored if there is no fluctuation of the fuel pressure. The internal fuel pressure is approximately 27000 to 45000 kPa (275 to 459 kgf/cm², 3915 to 6525 psi) when idling, and it increases to approximately 45000 to 78000 kPa (459 to 795 kgf/cm², 6525 to 11310 psi) when running the engine at 3000 rpm.
  
  If this DTC is stored, the ECM enters fail-safe mode and limits engine power. The fail-safe mode continues until the ignition switch is turned off.
- The diagram below indicates that fuel pressure rises as engine speed increases, but for the malfunction indicated by this DTC, that does not happen.

P0190, P0192 and P0193 (Open or short in fuel pressure sensor circuit):
These DTCs are stored if the fuel pressure sensor output voltage is out of the standard range due to an open or short malfunction of the sensor circuit.

If these DTCs are stored, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned off.

CONFIRMATION DRIVING PATTERN

DTC No.	DTC Detection Drive Pattern
P0087	After idling for 60 seconds, repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds
P0190	Ignition switch ON for 1 second
P0192
P0193

WIRING DIAGRAM


*a	Fuel Pressure Sensor

CAUTION / NOTICE / HINT

Note

After replacing the ECM, the new ECM needs registration (Click here ) and initialization Click here.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

CHECK DTC OUTPUT

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine > Trouble Codes

Read the DTCs.

Result

Proceed to
DTC P0190, P0192 or P0193 is output
DTC P0087 is output

DTC P0087 is output

GO TO STEP 4 Click here

DTC P0190, P0192 or P0193 is output

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Disconnect the fuel pressure sensor connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
B70-5 (PR) - B76-66 (PCR1)	Always	Below 1 Ω
B70-2 (PR2) - B76-114 (PCR2)	Always	Below 1 Ω
B70-1 (VCS) - B76-69 (VCS)	Always	Below 1 Ω
B70-6 (VC) - B76-68 (VCM)	Always	Below 1 Ω
B70-4 (E2) - B76-67 (E2M)	Always	Below 1 Ω
B70-3 (E2S) - B76-91 (E2S)	Always	Below 1 Ω
B70-5 (PR) or B76-66 (PCR1) - Body ground	Always	10 kΩ or higher
B70-2 (PR2) or B76-114 (PCR2) - Body ground	Always	10 kΩ or higher
B70-1 (VCS) or B76-69 (VCS) - Body ground	Always	10 kΩ or higher
B70-6 (VC) or B76-68 (VCM) - Body ground	Always	10 kΩ or higher
B70-4 (E2) or B76-67 (E2M) - Body ground	Always	10 kΩ or higher
B70-3 (E2S) or B76-91 (E2S) - Body ground	Always	10 kΩ or higher

Result

Proceed to
OK
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL PRESSURE SENSOR)

*a
Front view of wire harness connector

(to Fuel Pressure Sensor)

Disconnect the fuel pressure sensor connector.
Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
B70-6 (VC) - B70-4 (E2)	Ignition switch ON	4.5 to 5.5 V
B70-1 (VCS) - B70-3 (E2S)	Ignition switch ON	4.5 to 5.5 V

Reconnect the fuel pressure sensor connector.

Result

Proceed to
OK
NG

GO TO STEP 7 Click here

REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

Replace the common rail assembly.

Click here

Result

Proceed to
NEXT

BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system.

Click here

Result

Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0087, P0190, P0192, P0193)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Let the engine idle for 60 seconds, and then repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine > Trouble Codes

Read the DTCs.

Result

Proceed to
DTC P0087, P0190, P0192 or P0193 is output
DTC is not output

DTC is not output

END

DTC P0087, P0190, P0192 or P0193 is output

REPLACE ECM

Replace the ECM.

Click here

Result

Proceed to
NEXT

GO TO STEP 9 Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

Result

Proceed to
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Turn the ignition switch off for 30 seconds or more.
Turn the ignition switch to ON.
Let the engine idle for 60 seconds, and then repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds.
Turn the GTS on.

Confirm that the DTC is not output again.

Tech Tips

Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

Powertrain > Engine > Utility

Tester Display

All Readiness
Input DTC P0087, P0190, P0192 and/or P0193.
Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, increase the idling time.

Tester Display
All Readiness

Result

Proceed to
NEXT

END