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Fuel Injector: Inspection

  1. INSPECT FUEL INJECTOR ASSEMBLY 
    1. Check the injector resistance.
      1. Measure the resistance between the terminals.

        Standard: 13.4 to 14.2 Ω at 20°C (68°F) 

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

    2. Check the injector injection.
      CAUTION:
      • This test involves high-pressure fuel and electricity.
      • Take every precaution regarding safe handling of both the fuel and the electricity.
      • Perform this test in a safe area, and avoid any sparks or flame.
      • Do not smoke.
      1. Purchase the new fuel tube and take out the fuel tube connector from its pipe.

        Fuel tube: Parts No. 23801-20190

        Fig 1: Identifying Fuel Tube Connector
        G04383592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect SST and the fuel tube connector to the fuel pipe.
        Fig 2: Connecting SST And Fuel Tube Connector To Fuel Pipe
        G04383593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09268-41047 

        CAUTION: Always read the precautions (See PRECAUTION ) before connecting the fuel tube connector (quick type).
      3. Install the O-ring to the injector.
      4. Connect SST (union and hose) to the injector, and hold the injector and the union with SST (clamp).
        Fig 3: Connecting SST (Union And Hose) To Injector And Holding Injector And Union With SST (Clamp)
        G04383594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      5. Put the injector into a graduated cylinder.

        HINT:

        Install a suitable vinyl tube onto the injector to contain the gasoline spray.

      6. Operate the fuel pump (See ON-VEHICLE INSPECTION ).
      7. Connect SST (wire) to the injector and the battery for 15 seconds, and measure the injection volume with a graduated cylinder. Test each injector 2 or 3 times.
        Fig 4: Connecting SST (Wire) To Injector And Battery And Measuring Injection Volume With Graduated Cylinder
        G04383595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        SST 09842-30070 

        Standard 

        STANDARD INJECTION VOLUME REFERENCE

        Injection Volume Difference Between Each Injector
        60 to 73 cm 3 (3.7 to 4.5 cu in.) per 15 seconds 13 cm 3 (0.8 cu in.) or less
        NOTE: Always turn on and off the voltage on the battery side, not the fuel pump side.

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

    3. Check fuel leakage.
      1. In the condition above, disconnect the test probes of SST (wire) from the battery and check the fuel leakage from the injector.

        Fuel drop: 1 drop or less per 12 minutes 

        2. Fig 5: Checking Fuel Leakage
        G04383596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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