Dtc P0087 Fuel Rail / System Pressure - Too Low

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Engine Control System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF FUEL PRESSURE SENSOR

CHECK IF DTC OUTPUT RECURS

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

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.

Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0087 Fuel Rail / System Pressure - Too Low


DTC No.
DTC Detection Condition
Trouble Area
P0087
Fuel pressure sensor output voltage stays at fixed value
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. 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)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM
P0192
Fuel pressure sensor output voltage is 0.55 V or less for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM
P0193
Fuel pressure sensor output voltage is 4.9 V or more for 0.5 seconds
(1 trip detection logic)
  1. Open or short in fuel pressure sensor circuit
  2. Fuel pressure sensor
  3. ECM

HINT:
  1. For more information on the fuel pressure sensor and common rail system, refer to the system description (Click here).
  2. 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 / Data List / Fuel Press.

Reference:
Engine Speed
Fuel Pressure
Idling
Approximately 37 to 43 MPa
3,000 rpm (No engine load)
Approximately 60 to 66 MPa

MONITOR DESCRIPTION

  1. 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 37 to 43 MPa (377 to 439 kgf/cm2, 5,365 to 6,235 psi) when idling, and it increases to approximately 60 to 66 MPa (612 to 673 kgf/cm2, 8,700 to 9,570 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 engine switch is turned off.

    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0087 Fuel Rail / System Pressure - Too Low

  1. 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 engine switch is turned off.

MONITOR STRATEGY


P0087:
Required Sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
1 second
MIL operation
1 driving cycle

P0190:
Required Sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

P0192:
Required Sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

P0193:
Required Sensors
Fuel pressure sensor
Frequency of operation
Continuous
Duration
0.5 seconds
MIL operation
1 driving cycle

TYPICAL ENABLING CONDITIONS


P0087:
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


P0087:
Detection Criteria
Threshold
Changing value of fuel pressure
Virtually no fluctuation

P0190:
Detection Criteria
Threshold
Fuel pressure sensor output voltage
Less than 0.55 V or more than 4.9 V

P0192:
Detection Criteria
Threshold
Fuel pressure sensor output voltage
Less than 0.55 V

P0193:
Detection Criteria
Threshold
Fuel pressure sensor output voltage
More than 4.9 V

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0087 Fuel Rail / System Pressure - Too Low


INSPECTION PROCEDURE

NOTICE:
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
HINT:
  1. After completing repairs, check that P0087, P0190, P0192 and/or P0193 is not set again.
  2. 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

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

  1. Read the values.

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

    Engine Speed
    		Fuel Pressure
    Idling
    		Approximately 37 to 43 MPa
    3,000 rpm (No engine load)
    		Approximately 60 to 66 MPa


NG
Go to step 3
OK


2.CHECK IF DTC OUTPUT RECURS

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch ON (IG) and turn the intelligent tester ON.

  1. Enter the following menus: Powertrain / Engine / DTC / Clear.

  1. Clear the DTC(s).

  1. Let the engine idle for 60 seconds, and then repeat quick engine RPM accelerations (to 2,500 rpm) for 30 seconds.

  1. Enter the following menus: Powertrain / Engine / DTC.

  1. Read the DTC(s).

    Result:

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


B
CHECK FOR INTERMITTENT PROBLEMS
A

REPLACE ECM

3.CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Engine Control System.Ecd System. Dtc P0087 Fuel Rail / System Pressure - Too Low

  1. Disconnect the E59 ECM connector.

  1. Disconnect the E65 fuel pressure sensor connector.

  1. Check the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    PCR1 (E59-67) - PR (E65-5)
    		Below 1 Ω
    PCR2 (E59-114) - PR2 (E65-2)
    		Below 1 Ω
    VCS (E59-68) - VCS (E65-1)
    		Below 1 Ω
    VCM (E59-69) - VC (E65-6)
    		Below 1 Ω
    E2M (E59-91) - E2 (E65-4)
    		Below 1 Ω
    E2S (E59-66) - E2S (E65-3)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    PCR1 (E59-67) or PR (E65-5) - Body ground
    		10 kΩ or higher
    PCR2 (E59-114) or PR2 (E65-2) - Body ground
    		10 kΩ or higher
    VCS (E59-68) or VCS (E65-1) - Body ground
    		10 kΩ or higher
    VCM (E59-69) or VC (E65-6) - Body ground
    		10 kΩ or higher
    E2M (E59-91) or E2 (E65-4) - Body ground
    		10 kΩ or higher
    E2S (E59-66) or E2S (E65-3) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the fuel pressure sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMMON RAIL ASSEMBLY