Dtc P0190 Fuel Rail Pressure Sensor Circuit

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Engine Control System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)

INSPECT ECM (PR VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)

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 fuel pressure sensor is installed on the delivery pipe. The sensor changes fuel pressure to an electrical signal and sends the signal to the ECM. Then the ECM controls the feedback of the pump discharge to maintain the fuel's target pressure at 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi). If the sensor output stops, the ECM will stop the high pressure side fuel pump and supply fuel using the low pressure side fuel pump.
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit
The fuel pressure sensor is installed on a fuel delivery pipe and detects the fuel pressure. It controls of feedback the pump discharge in order to keep the fuel at target pressure 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi) by the ECM.

DTC No.
DTC Detection Condition
Trouble Area
P0190
Open or short in fuel pressure sensor circuit for 5 seconds or more
(1 trip detection logic)
  1. Open or short in fuel pressure sensor
  2. Fuel pressure sensor
  3. ECM
P0192
Short in fuel pressure sensor circuit for 5 seconds or more
(1 trip detection logic)
  1. Short in fuel pressure sensor
  2. Fuel pressure sensor
  3. ECM
P0193
Open in fuel pressure sensor circuit for 5 seconds or more
(1 trip detection logic)
  1. Open in fuel pressure sensor
  2. Fuel pressure sensor
  3. ECM
HINT:
After confirming DTC P0190, use intelligent tester to confirm the fuel pressure in the delivery pipe in Power train / Engine / Data List / Fuel Press.

Fuel Pressure (MPa)
Malfunction
Approximately 0
  1. PR circuit short
19.6 or more
  1. VC circuit open or short
  2. PR circuit open
  3. E2 circuit open

MONITOR DESCRIPTION

These DTCs are set if the fuel pressure sensor output voltage is out of the standard range. The DTCs stand for an open or short malfunction of the sensor circuit.
If these DTCs are set, the ECM enters fail-safe mode and limits the engine power. Fail-safe mode continues until the engine switch is turned to off.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit


INSPECTION PROCEDURE

HINT:
  1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ VALUE OF INTELLIGENT TESTER (FUEL PRESSURE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the intelligent tester ON.

  1. On the intelligent tester, enter the following menus: Power train / Engine / Data List / Fuel Press.

  1. Read the values.

    Pressure:
    4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi)

    Result:
    Fuel Pressure (MPa)
    		Proceed to
    19.6 or more
    		A
    0.0
    		B
    OK (4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi)) *
    		C
    HINT:
    *: The value must be changed when the engine is run or stopped.


B
Go to step 3

C
CHECK FOR INTERMITTENT PROBLEMS
A


2.INSPECT FUEL PRESSURE SENSOR (VC VOLTAGE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit

  1. Disconnect the E66 fuel pressure sensor connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage between the specified terminals of the E66 fuel pressure sensor connector.

    Standard Voltage:
    Tester Connection
    		Specified Condition
    VC (E66-3) - E2 (E66-1)
    		4.5 to 5.5 V


NG
Go to step 4
OK


3.INSPECT ECM (PR VOLTAGE)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit

  1. Start the engine.

  1. Measure the voltage between the specified terminals of the E45 and E8 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    PR (E45-25) - E2 (E8-28)
    		1.8 to 2.3 V at 25 °C (77°F)
HINT:
The fuel pressure in the delivery pipe is 4 to 13 MPa (40.8 to 132.6 kgf/cm2, 580 to 1,885 psi)


NG
Go to step 5
OK

REPLACE ECM

4.CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit

  1. Disconnect the E8 and E45 ECM connectors.

  1. Disconnect the E66 fuel pressure sensor connector.

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

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    VC (E8-29) - VC (E66-3)
    		Below 1 Ω
    PR (E45-25) - PR (E66-2)
    		Below 1 Ω
    E2 (E8-28) - E2 (E66-1)
    		Below 1 Ω
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    VC (E8-29) or VC (E66-3) - Body ground
    		10 kΩ or higher
    PR (E45-25) or PR (E66-2) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the fuel pressure sensor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM

5.CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)
Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Control System.Sfi System. Dtc P0190 Fuel Rail Pressure Sensor Circuit

  1. Disconnect the E66 fuel pressure sensor connector.

  1. Disconnect the E45 ECM connector.

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

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    PR (E45-25) or PR (E66-2) - Body ground
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the fuel pressure sensor connector.



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE FUEL PRESSURE SENSOR