DTC P0087 Fuel Rail / System Pressure - Too Low
DTC P0190 Fuel Rail Pressure Sensor Circuit
DTC P0192 Fuel Rail Pressure Sensor Circuit Low Input
DTC 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.
Toyota fault code list DTC P0087 DTC P0190 DTC P0192 DTC P0193
DTC No. | DTC Detection Condition | Trouble Area |
P0087 | Fuel pressure sensor output voltage stays at fixed value (1 trip detection logic) |
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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) |
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P0192 | Fuel pressure sensor output voltage is 0.55 V or less for 0.5 seconds (1 trip detection logic) |
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P0193 | Fuel pressure sensor output voltage is 4.9 V or more for 0.5 seconds (1 trip detection logic) |
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HINT:
- For more information on the fuel pressure sensor and common rail system, refer to the system description.
- 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.
Engine Speed | Fuel Pressure |
Idling | Approximately 37 to 43 MPa |
3,000 rpm (No engine load) | Approximately 60 to 66 MPa |
MONITOR DESCRIPTION
- P0087 (Fuel pressure sensor output stays at fixed value):
Under normal conditions, 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 conditions are constant. The internal fuel pressure is approximately 35 to 45 MPa (357 to 459 kgf/cm2, 5,076 to 6,525 psi) when idling, and it increases to approximately 58 to 68 MPa (592 to 694 kgf/cm2, 8,410 to 9,860 psi) when running the engine at 3,000 rpm. This DTC is set if there is no fluctuation of the fuel pressure.
If this DTC is set, the ECM enters fail-safe mode and limits 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.
MONITOR STRATEGY
Required Sensors | Fuel pressure sensor |
Frequency of operation | Continuous |
Duration | 1 second |
MIL operation | 1 driving cycle |
Required Sensors | Fuel pressure sensor |
Frequency of operation | Continuous |
Duration | 0.5 seconds |
MIL operation | 1 driving cycle |
Required Sensors | Fuel pressure sensor |
Frequency of operation | Continuous |
Duration | 0.5 seconds |
MIL operation | 1 driving cycle |
Required Sensors | Fuel pressure sensor |
Frequency of operation | Continuous |
Duration | 0.5 seconds |
MIL operation | 1 driving cycle |
TYPICAL ENABLING CONDITIONS
Item | Specification | Specification |
Minimum | Maximum | |
Engine speed | 500 rpm | - |
Battery voltage | 8 V | - |
Fuel volume | 5 mm3 | - |
The monitor will not run if the fuel pressure sensor circuit (P0190, P0192 and P0193) is malfunctioning. |
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria | Threshold |
Changing value of fuel pressure | Virtually no fluctuation |
Detection Criteria | Threshold |
Fuel pressure sensor output voltage | Less than 0.55 V or more than 4.9 V |
Detection Criteria | Threshold |
Fuel pressure sensor output voltage | Less than 0.55 V |
Detection Criteria | Threshold |
Fuel pressure sensor output voltage | More than 4.9 V |
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
After replacing the ECM, the new ECM needs registration and initialization.
HINT:
- 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.
1.READ VALUE OF FUEL PRESSURE SENSOR |
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Connect the intelligent tester to the DLC3.
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Start the engine and turn the tester ON.
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Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press.
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Read the values.
OK:
The internal fuel pressure of the common rail is within the specification below.Engine Speed Fuel Pressure Idling Approximately 35 to 45 MPa 3,000 rpm (No engine load) Approximately 58 to 68 MPa
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OK | |
2.CHECK IF DTC OUTPUT RECURS |
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Connect the intelligent tester to the DLC3.
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Turn the ignition switch on (IG) and turn the tester ON.
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Enter the following menus: Powertrain / Engine and ECT / DTC / Clear.
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Clear the DTCs.
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Let the engine idle for 60 seconds, and then repeat quick engine RPM accelerations (to 2,500 rpm) for 30 seconds.
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Enter the following menus: Powertrain / Engine and ECT / DTC.
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Read the DTCs.
Result:
Display (DTC Output) Proceed to P0087, P0190, P0192 or P0193 A No output B
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A | |
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3.CHECK WIRE HARNESS (FUEL PRESSURE SENSOR - ECM) |
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Disconnect the B60 fuel pressure sensor connector.
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Disconnect the B32 ECM connector.
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Measure the resistance of the wire harness side connectors.
Standard resistance:
Tester Connection Specified Condition B60-5 (PR) - B32-67 (PCR1) Below 1 ? B60-2 (PR2) - B32-114 (PCR2) Below 1 ? B60-1 (VCS) - B32-68 (VCS) Below 1 ? B60-6 (VC) - B32-69 (VCM) Below 1 ? B60-4 (E2) - B32-91 (E2M) Below 1 ? B60-3 (E2S) - B32-66 (E2S) Below 1 ? B60-5 (PR) or B32-67 (PCR1) - Body ground 10 k? or higher B60-2 (PR2) or B32-114 (PCR2) - Body ground 10 k? or higher B60-1 (VCS) or B32-68 (VCS) - Body ground 10 k? or higher B60-6 (VC) or B32-69 (VCM) - Body ground 10 k? or higher B60-4 (E2) or B32-91 (E2M) - Body ground 10 k? or higher B60-3 (E2S) or B32-66 (E2S) - Body ground 10 k? or higher
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Reconnect the fuel pressure sensor connector.
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Reconnect the ECM connector.
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OK | |
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