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Home >> Toyota >> 2018 >> Highlander LE Plus, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 110 (SFI System (2GR-FXS) - Diagnostic Codes - (Hybrid) (4 Of 4)) >> SFI System >> DTC P0191: Fuel Rail Pressure Sensor Circuit Range / Performance [11/2016 - 10/2017] >> Procedure

DTC P0191: Fuel Rail Pressure Sensor Circuit Range / Performance [11/2016 - 10/2017]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0191) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine and ECT > Trouble Codes 

      Result

      Result Proceed to
      DTC P0191 is output A
      DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output
      DTC P0191 and other DTCs are output B

      HINT: 

      • If DTC P0191 and P0087, P0088, P0171, P0172, P0174 and/or P0175 are output simultaneously, troubleshoot for DTC P0191 first.
      • If any DTCs other than P0191 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017] 

    Result: 

    A 

    See step  2

  2. CHECK FUEL LEAK 
    1. Check around and beneath the vehicle for fuel leaks, fumes, etc.

      OK

      No fuel leaks present.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE TARGET FUEL PRESSURE) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in inspection mode (maintenance mode).

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    5. Start the engine and warm it up.
    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Target Fuel Pressure / Data List / High Fuel Pressure Sensor.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Control the Target Fuel Pressure
      Data List Display
      High Fuel Pressure Sensor
    7. Check the value of the Data List item "High Fuel Pressure Sensor" when the target fuel pressure is increased and decreased using the Active Test.

      Result

      Result Proceed to
      "High Fuel Pressure Sensor" value follows the change in target fuel pressure A
      "High Fuel Pressure Sensor" value does not follow the change in target fuel pressure B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) - ECM) 
    1. Disconnect the fuel pressure sensor (for high pressure side) connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C71-3 (PR) - C1-86 (PR) Always Below 1 Ω
      C71-2 (E2) - C1-85 (EPR) Always Below 1 Ω
      C71-3 (PR) or C1-86 (PR) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  5

  5. REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)) 
    1. Replace the fuel delivery pipe with sensor assembly LH (fuel pressure sensor (for high pressure side)).

      Refer to REMOVAL [11/2016 - ]

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

      Refer to INITIALIZATION [11/2016 - ]

    NEXT 

    See step  6

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the power switch off and wait for at least 30 seconds.
    6. Turn the power switch on (IG).
    7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    9. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes 

      Result

      Result Proceed to
      DTC P0191 is output A
      DTCs are not output B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  7

  7. REPLACE ECM 
    1. Replace the ECM.

      Refer to REMOVAL [11/2016 - ]

    NEXT 

    See step  11

  8. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace the wire harness or connector.

    NEXT 

    See step  11

  9. REPLACE FUEL DELIVERY PIPE WITH SENSOR ASSEMBLY LH (FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)) 
    1. Replace the fuel delivery pipe with sensor assembly LH (fuel pressure sensor (for high pressure side)).

      Refer to REMOVAL [11/2016 - ]

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

      Refer to INITIALIZATION [11/2016 - ]

    NEXT 

    See step  11

  10. REPAIR OR REPLACE FUEL LEAK POINT 
    1. Repair or replace the fuel leak point.

    NEXT 

    See step  11

  11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0191) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Powertrain > Engine and ECT > Clear DTCs 

    5. Turn the power switch off and wait for at least 30 seconds.
    6. Turn the power switch on (IG).
    7. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
    8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    9. Read the pending DTCs.

      Powertrain > Engine and ECT > Trouble Codes 

      OK

      DTCs are not output

    END 

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