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Home >> Lexus >> 2009 >> GS 460 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010 & P0441) & Circuit Tests) >> SFI System >> 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 >> Procedure
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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: Procedure

  1. READ VALUE USING TECHSTREAM (FUEL PRESSURE) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream ON.
    4. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
    5. Read the values.

      Pressure

      4 to 13 MPa (40.8 to 132.6 kgf/cm2 , 580 to 1885 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 1885 psi)] * C

      HINT: 

      *: The value must change when the engine is run or stopped.

    C → See step   5 

    B → See step   3 

    A: Go to next step 

  2. INSPECT ECM (VC VOLTAGE) 
    1. Disconnect the fuel pressure sensor connector.
      Fig 1: Inspecting ECM (VC Voltage)
      GTY105399Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the engine switch on (IG).
    3. Measure the voltage between the terminals of the fuel pressure sensor connector.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      H16-1 (VC) - H16-3 (E2) Engine switch on (IG) 4.5 to 5.5 V
    4. Reconnect the fuel pressure sensor connector.

    NG → See step   4 

    OK: Go to next step 

  3. INSPECT FUEL PRESSURE SENSOR 
    1. Inspect the fuel pressure sensor. Refer to INSPECTION .

    NG → See step   6 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM) 
    1. Disconnect the fuel pressure sensor connector.
      Fig 2: Checking Harness And Connector (Fuel Pressure Sensor - ECM)
      GTY105398Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the ECM connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Condition Specified Condition
      H16-1 (VC) - E84-18 (VC) Always Below 1 Ω
      H16-2 (PR) - E86-27 (PR) Always Below 1 Ω
      H16-3 (E2) - E84-28 (E2) Always Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Condition Specified Condition
      H16-1 (VC) or E84-18 (VC) - Body ground Always 10 kΩ or higher
      H16-2 (PR) or E86-27 (PR) - Body ground Always 10 kΩ or higher
    4. Reconnect the fuel pressure sensor connector.
    5. Reconnect the ECM connectors.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   7 

  5. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS 
  6. REPLACE FUEL PRESSURE SENSOR. Refer to  COMPONENTS 
  7. REPLACE ECM. Refer to  COMPONENTS 
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