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Fuel System: Inspection

  1. INSPECT FUEL INJECTOR ASSY 
    1. Check the resistance.
      1. Using an ohmmeter measure the resistance between the terminals.

        Standard:

        TESTER CONNECTION AND SPECIFIED CONDITION (1ZZ-FE [2WD], 2ZZ-GE)

        Tester Connection Specified Condition
        1-2 11.6to12.4 Ω at 20°C (680°F)
        TESTER CONNECTION AND SPECIFIED CONDITION (1ZZ-FE[4WD])

        Tester Connection Specified Condition
        1-2 13.4 to 14.2 flat 20° C (68° F)

        If the result is not as specified, replace the fuel injector.

        Fig 1: Identifying Fuel Injector Connector Terminals
        G02678140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the injection volume.
      NOTE:
      • Perform the test in a well-ventilated area and watch out for flames.
      • Handle the fuel tube connector carefully.
      Fig 2: Cutting Protector Of Fuel Tube Protector
      G02678141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Prepare a new fuel tube.

        HINT:

        FUEL TUBE SPECIFICATION

        Engine Type Part No.
        12Z-FE(FF) 23901 -OD040
        1ZZ-FE(4WD) 23901-OD010
        2ZZ-GE 23271-22010
      2. Using a cutter knife, cut the protector of the fuel tube protector as illustrated. Tear 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.
      3. Install the fuel tube connector into SST, then connect the fuel tube connect to the fuel pipe (the vehicle side).

        SST 09268-41047 95336-08070

        CAUTION: Connect the fuel tube connector (quick type) in accordance with to the precautions.
        Fig 3: Installing Fuel Tube Connector Into SST
        G02678142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Install a new O-ring onto the fuel injector.
      5. Install SST and the vinyl tube onto the fuel injector.

        SST 09268-41047 (09268-41110, 09268-41300, 95336-08070)

        Fig 4: Installing SST And Vinyl Tube Onto Fuel Injector
        G02678143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Set the fuel injector in a graduated cylinder.

        HINT:

        Install a suitable vinyl tube onto the injector to prevent gasoline splashes.

      7. Actuate the fuel pump. (See ON-VEHICLE INSPECTION )
      8. Install SST onto the fuel injector.

        SST 09842-30080

      9. Connect SST to the battery, then measure the injection volume for 15 seconds. Perform the inspection 2 or 3 times, then calculate the average.

      Standard: 

      FUEL INJECTOR SPECIFICATION (1ZZ-FE)

      Injection Volume Difference between each fuel injector
      60 to 73 3 (3.6 to 4.5 cu In.) per 15 seconds 13 3 (0.8 cu in.) or less
      FUEL INJECTOR SPECIFICATION (2ZZ-GE)

      Injection Volume Difference between each fuel injector
      77 to 94 3 (4.7 to 5.7 cu in.) per 15 seconds 1 7 3 (1.0 cu in.) or less
      Fig 5: Connecting SST To Battery
      G02678144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Always do the switching at the battery side.

      If the result is not as specified, replace the fuel injector.

    3. Inspect the leakage.
      1. When inspecting the injection volume, remove SST from the battery. Inspect the fuel leakage from the fuel injector.

      Standard: 1 drop or less every 12 minutes 

      If the result is not as specified, replace the fuel injector.

      Fig 6: Inspecting Fuel Leakage From Fuel Injector (2WD)
      G02678145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 7: Inspecting Fuel Leakage From Fuel Injector (4WD)
      G02678146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FUEL PUMP 
    1. Check resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        TESTER CONNECTION AND SPECIFIED CONDITION

        Tester Connection Specified Condition
        1-2 0.2 to 3.0 Ω at 20°C (68 °C)

      t is not as specified, replace the fuel pump.

      Fig 8: Identifying Fuel Pump Connector Terminals
      G02678147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the operation
      1. Apply battery voltage to both terminals. Check that the pump operates.
      NOTE:
      • These tests must be done quickly (for less than 10 seconds) to prevent the coil burnout.
      • Keep the fuel pump as far away from the battery as possible.
      • Always do the switching at the battery side.

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

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