Dtc P0087 Fuel Rail / System Pressure - Too Low

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

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.


Dtc P0087 Fuel Rail / System Pressure - Too Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

DTC No.DTC Detection ConditionTrouble Area
P0087 Fuel pressure sensor output voltage stays at fixed value
(1 trip detection logic)
Open or short in fuel pressure sensor circuit
Fuel pressure sensor
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)
Open or short in fuel pressure sensor circuit
Fuel pressure sensor
ECM
P0192 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
ECM
P0193 Fuel pressure sensor output voltage is 4.9 V or more for 0.5 seconds
(1 trip detection logic)
Open or short in fuel pressure sensor circuit
Fuel pressure sensor
ECM
  • 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 / Data List / Fuel Press.
Reference:
Engine SpeedFuel Pressure
IdlingApproximately 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 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.


Dtc P0087 Fuel Rail / System Pressure - Too Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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 SensorsFuel pressure sensor
Frequency of operationContinuous
Duration1 second
MIL operation1 driving cycle
P0190:
Required SensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 seconds
MIL operation1 driving cycle
P0192:
Required SensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 seconds
MIL operation1 driving cycle
P0193:
Required SensorsFuel pressure sensor
Frequency of operationContinuous
Duration0.5 seconds
MIL operation1 driving cycle

TYPICAL ENABLING CONDITIONS

P0087:
ItemSpecificationSpecification
MinimumMaximum
Engine speed500 rpm-
Battery voltage8 V-
Fuel volume5 mm3 -
The monitor will not run if the fuel pressure sensor circuit (P0190, P0192 and P0193) is malfunctioning.

TYPICAL MALFUNCTION THRESHOLDS

P0087:
Detection CriteriaThreshold
Changing value of fuel pressureVirtually no fluctuation
P0190:
Detection CriteriaThreshold
Fuel pressure sensor output voltageLess than 0.55 V or more than 4.9 V
P0192:
Detection CriteriaThreshold
Fuel pressure sensor output voltageLess than 0.55 V
P0193:
Detection CriteriaThreshold
Fuel pressure sensor output voltageMore than 4.9 V

WIRING DIAGRAM

Dtc P0087 Fuel Rail / System Pressure - Too Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

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

Connect the intelligent tester to the DLC3.

Start the engine and turn the intelligent tester ON.

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

Read the values.

  • OK:
  • The internal fuel pressure of the common rail is within the specification below.
Engine SpeedFuel Pressure
IdlingApproximately 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

Connect the intelligent tester to the DLC3.

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

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

Clear the DTC(s).

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

Enter the following menus: Powertrain / Engine / DTC.

Read the DTC(s).

  • Result:
  • Display (DTC Output)Proceed to
    P0087, P0190, P0192 or P0193A
    No outputB
B
CHECK FOR INTERMITTENT PROBLEMS
A
REPLACE ECM
3.CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)
Dtc P0087 Fuel Rail / System Pressure - Too Low. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E59 ECM connector.

Disconnect the E65 fuel pressure sensor connector.

Check the resistance between the wire harness side connectors.

  • Standard resistance (Check for open):
  • Tester ConnectionSpecified 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 ConnectionSpecified Condition
    PCR1 (E59-67) or PR (E65-5) - Body ground10 kΩ or higher
    PCR2 (E59-114) or PR2 (E65-2) - Body ground10 kΩ or higher
    VCS (E59-68) or VCS (E65-1) - Body ground10 kΩ or higher
    VCM (E59-69) or VC (E65-6) - Body ground10 kΩ or higher
    E2M (E59-91) or E2 (E65-4) - Body ground10 kΩ or higher
    E2S (E59-66) or E2S (E65-3) - Body ground10 kΩ or higher

Reconnect the ECM connector.

Reconnect the fuel pressure sensor connector.

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE COMMON RAIL ASSEMBLY