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 Detection Drive Pattern | DTC Detection Condition | Trouble Area |
---|---|---|
After idling for 60 seconds, repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds | Fuel pressure sensor output voltage stays at fixed value for 90 seconds. (1 trip detection logic) |
|
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) |
Tech Tips Trouble areas are related to the electrical system only (pumps are not involved) |
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) |
Tech Tips Trouble areas are related to the electrical system only (pumps are not involved) |
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) |
Tech Tips Trouble areas are related to the electrical system only (pumps are not involved) |
DTC No. | Data List |
---|---|
P0087 |
|
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 37000 kPa (275 to 377 kgf/cm2, 3915 to 5365 psi) when idling, and it increases to approximately 50000 to 70000 kPa (510 to 714 kgf/cm2, 7250 to 10150 psi) when running the engine at 2500 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.
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.
WIRING DIAGRAM
INSPECTION PROCEDURE
Note
After replacing the ECM, the new ECM needs registration Click here and initialization Click here.
Tech Tips
If DTCs relating to different systems are stored and they share terminal E2 as their ground, 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.
PROCEDURE
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.
Result | Proceed to |
---|---|
P0190, P0192, P0193 | A |
P0087 | B |
B |
REPLACE FUEL PRESSURE SENSOR (COMMON RAIL) Click here |
A |
CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)
*a | Front view of wire harness connector (to Fuel Pressure Sensor) |
*b | Front view of wire harness connector (to 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) | |||||||||||||||||||||
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Standard Resistance (Check for Short) | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Reconnect the fuel pressure sensor connector.
Reconnect the ECM connector.
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR Click here |
OK |
CHECK ECM (FUEL PRESSURE SENSOR VOLTAGE)
*a | Front view of wire harness connector (to Fuel Pressure Sensor) |
Disconnect the fuel pressure sensor connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the fuel pressure sensor connector.
NG |
REPLACE ECM Click here |
OK |
REPLACE FUEL PRESSURE SENSOR (COMMON RAIL)
Replace the common rail Click here.
NEXT |
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system Click here.
NEXT |
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 repeat quick engine speed accelerations (to 2500 rpm) for 30 seconds.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs.
Result | Proceed to |
---|---|
P0087, P0190, P0192 or P0193 is output | A |
No DTC is output | B |
B |
END |
A |
REPLACE ECM
Replace the ECM Click here.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here |
REPAIR OR REPLACE HARNESS OR CONNECTOR
Repair or replace the harness or connector.
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Connect the intelligent tester to the DLC3.
Clear the DTCs Click here.
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.
Confirm that the DTC is not output again.
Tech Tips
Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input DTC P0087, P0190, P0192 and/or P0193.
Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase the idling time.
NEXT |
END