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

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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 so that it reaches the target pressure. The pressure sensor is a semiconductor that varies electrical resistance when pressure is applied to its silicon chip. This sensor outputs a voltage in proportion to the internal fuel pressure.

Table 1. P0087
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
After idling for 60 seconds, quickly increase engine speed to 2500 rpm repeatedly for 30 seconds	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) Ran out of fuel Fuel frozen ECM

Table 2. P0190
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 1 second	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) ECM Tip: Trouble areas are related to the electrical system only (pumps are not involved)

Table 3. P0192
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 1 second	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) ECM Tip: Trouble areas are related to the electrical system only (pumps are not involved)

Table 4. P0193
DTC Detection Drive Pattern	DTC Detection Condition	Trouble Area
Ignition switch ON for 1 second	Fuel pressure sensor output voltage is 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) ECM Tip: Trouble areas are related to the electrical system only (pumps are not involved)

Table 5. Related Data List
DTC No.	Data List
P0087	Fuel Press Target Common Rail Pressure
P0190
P0192
P0193

Tip:

Check Fuel Press and compare it 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 5000 kPa or less.
For more information on the fuel pressure sensor and common rail system, refer to 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 performed by fail-safe function
If DTC P0190, P0192 and/or P0193 is stored, the following symptom may appear:
- Lack of power due to accelerator restriction performed by fail-safe function
If DTC P0190, P0192 and/or P0193 is stored, "Fuel Press" always displays 0 kPa or 200000 kPa.

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MONITOR DESCRIPTION

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

Under normal conditions, the internal fuel pressure of the common rail usually fluctuates by 1000 to 2000 kPa (10 to 20 kgf/cm², 145 to 290 psi) even when driving conditions are constant. This DTC is stored if there is no fluctuation of the fuel pressure. The internal fuel pressure is approximately 30000 to 40000 kPa (306 to 408 kgf/cm², 4350 to 5800 psi) when idling, and it increases to approximately 45000 to 75000 kPa (459 to 765 kgf/cm², 6527 to 10878 psi) when running the engine at 3000 rpm.

If this DTC is stored, the ECM enters fail-safe mode and limits engine power. The ECM continues operating in fail-safe mode 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 ECM continues operating in fail-safe mode until the ignition switch is turned off.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

Tip:

If DTCs relating to different systems which share terminal E2 as their ground are stored, check this ground circuit first.
Read freeze frame data using the intelligent tester. 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.

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PROCEDURE

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CHECK DTC OUTPUT

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Table 6. Result
Result	Proceed to
P0190, P0192, P0193	A
P0087	B

AClick here
BClick here

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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 (Check for Open)

Tester Connection	Condition	Specified Condition
C82-5 (PR) - C90-16 (PCR1)	Always	Below 1 Ω
C82-2 (PR2) - C90-2 (PCR2)	Always	Below 1 Ω
C82-1 (VCS) - C90-13 (VCS)	Always	Below 1 Ω
C82-6 (VC) - C90-14 (VCM)	Always	Below 1 Ω
C82-4 (E2) - C90-15 (E2M)	Always	Below 1 Ω
C82-3 (E2S) - C90-8 (E2S)	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
C82-5 (PR) or C90-16 (PCR1) - Body ground	Always	10 kΩ or higher
C82-2 (PR2) or C90-2 (PCR2) - Body ground	Always	10 kΩ or higher
C82-1 (VCS) or C90-13 (VCS) - Body ground	Always	10 kΩ or higher
C82-6 (VC) or C90-14 (VCM) - Body ground	Always	10 kΩ or higher
C82-4 (E2) or C909-15 (E2M) - Body ground	Always	10 kΩ or higher
C82-3 (E2S) or C90-8 (E2S) - Body ground	Always	10 kΩ or higher

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

OKClick here
NGClick here

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CHECK ECM (FUEL PRESSURE SENSOR VOLTAGE)

Disconnect the fuel pressure sensor connector.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
C82-6 (VC) - C82-4 (E2)	Ignition switch ON	4.5 to 5.5 V
C82-1 (VCS) - C82-3 (E2S)	Ignition switch ON	4.5 to 5.5 V

Table 7. Text in Illustration
*a	Front view of wire harness connector (to fuel pressure sensor)

Reconnect the fuel pressure sensor connector.

OKClick here
NGClick here

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REPLACE FUEL PRESSURE SENSOR (COMMON RAIL)
1. Replace the common rail (Click here).
- NEXTClick here
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BLEED AIR FROM FUEL SYSTEM
1. Bleed the air from the fuel system (Click here).
- NEXTClick here

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

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Clear the DTCs (Click here).
Let the engine idle for 60 seconds, and then quickly increase the engine speed to 2500 rpm repeatedly for 30 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Table 8. Result
Result	Proceed to
P0087, P0190, P0192 or P0193 is output	A
No DTC is output	B

AClick here
BClick here

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REPLACE ECM
1. Replace the ECM (Click here).
- NEXTClick here
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REPAIR OR REPLACE HARNESS OR CONNECTOR
1. Repair or replace the harness or connector.
- NEXTClick here
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CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Connect the intelligent tester to the DLC3.
2. Clear the DTCs (Click here).
3. Turn the ignition switch off for 30 seconds or more.
4. Turn the ignition switch to ON.
5. Let the engine idle for 60 seconds, and then quickly increase the engine speed to 2500 rpm repeatedly for 30 seconds.
6. Confirm that the DTC is not output again.
  
  Tip:
  Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
  1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  2. Input DTC P0087, P0190, P0192 and/or P0193.
  3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, increase the idling time.
- NEXTClick here
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END

ECD SYSTEM (w/o DPF), Diagnostic DTC:P0087, P0190, P0192, P0193