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Home >> Toyota >> 2006 >> Prius >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Engine Fuel System (1NZ-FXE) >> Fuel System >> On-Vehicle Inspection

On-Vehicle Inspection

  1. CHECK FUEL PRESSURE 
    1. Prepare for the inspection.
      1. Prepare a new fuel tube.

        HINT:

        Part No. 23901-21081

      2. Using a cutter knife, cut off the protector of the fuel tube as illustrated. Tear off the protector by hand, then remove the fuel tube connector.
        NOTE: If the protector is cut too deeply using the cutter, the O-ring of the fuel tube connector will be damaged.
      Fig 1: Cutting Off Protector Of Fuel Tube Using Cutter Knife
      G04472827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Discharge fuel system pressure (see REMOVAL ).
    3. Using a voltmeter, measure the battery voltage.

      Standard voltage: 9.0 to 14 V 

    4. Disconnect the cable from the negative (-) battery terminal.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
    5. Disconnect the fuel tube (see REMOVAL ).
    6. Install SST and the fuel tube connector to the vehicle.

      SST 09268-41047 (95336-08070), 09268-45014 (09268-41200, 09268-41220, 09268-41250) 

    7. Wipe off any spilled gasoline.
    8. Connect the cable to the negative battery terminal.
      Fig 2: Installing SST And Fuel Tube Connector To Vehicle
      G04472828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Connect the intelligent tester (with CAN VIM) to the DLC3.
      Fig 3: Connecting Intelligent Tester (With CAN VIM) To DLC3
      G04472829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Measure the fuel pressure.

      Standard: 304 to 343 kPa (3.1 to 3.5 kgf/cm 2  , 44 to 50 psi) 

      • If the fuel pressure is greater than the standard value, replace the fuel tank.
      • If the fuel pressure is less than the standard value, check the connection of the fuel hose and fuel tank.
    11. Disconnect the intelligent tester from the DLC3.
    12. Set the vehicle to inspection mode.
    13. Start the engine.
    14. Measure the fuel pressure at idle.

      Standard: 304 to 343 kPa (3.1 to 3.5 kgf/cm 2  , 44 to 50 psi) 

    15. Stop the engine.
    16. After stopping the engine, check that the fuel pressure does not change for 5 minutes.

      Standard: 147 kPa (1.5 kgf/cm 2  , 21 psi) or more 

      If the fuel pressure is not as specified, check the fuel tank or fuel injectors (see INSPECTION ).

    17. After measuring the fuel pressure, disconnect the cable from the negative battery terminal. Remove SST and the fuel tube connector while taking care to prevent spilling gasoline.
    18. Connect the fuel tube (see INSTALLATION ).
  2. CHECK FUEL PUMP 
    1. Connect the intelligent tester (with CAN VIM) to the DLC3.
    2. Turn the power switch ON (IG).
      NOTE: Do not start the engine.
    3. Turn the intelligent tester ON.
    4. Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
    5. Check the fuel pump operation while operating it with the intelligent tester.
      Fig 4: Connecting Intelligent Tester (With CAN VIM) To DLC3
      G04472830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the fuel pump does not operate, replace the fuel tank.

  3. CHECK FOR FUEL LEAKS 
    1. Check that there are no leaks in the fuel system while fuel pressure is applied.