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Fuel System (3MZ-FE): Inspection

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

      Standard: 13.4 to 14.2 c 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 a new fuel tube and disconnect fuel tube connector from its pipe.

        Fuel tube: Parts No. 23801-20180

        Fig 1: Identifying Fuel Tube Connector
        G02596881Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect SST and the fuel tube connector to the fuel pipe.

        SST 09268-41047

        Fig 2: Connecting SST And Fuel Tube Connector To Fuel Pipe
        G02596882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        CAUTION: Always read the precautions (see FUEL SYSTEM (3MZ-FE) ) 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 union with SST (clamp).

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

      5. Put the injector into a graduated cylinder.
        Fig 3: Connecting SST (Union And Hose) To Injector And Hold Injector And Union With SST (Clamp)
        G02596883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        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 to the connector of injector
      8. Connect SST (wire) to the battery for 15 seconds, and measure the injector volume with a graduated cylinder. Test each injector 2or 3 time.

      SST 09842-30070

      Standard: 

      Fig 4: Connecting SST To Connector Of Injector
      G02596884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ITEM SPECIFIED CONDITION

      Item Specified Condition
      Injection Volume 60 to 73 cm3 (3.7 to 4.5 cu in.) per 15 seconds
      Difference Between Each Injector 13 cm3 (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 injection volume 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 

      Fig 5: Checking Fuel Leakage
      G02596885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FUEL PUMP 
    1. Check the fuel pump resistance.
      1. Measure the resistance between the terminals.

      Standard: 0.2 to 3.0 Ω at 20°C (68°F) 

    2. Check fuel pump operation.
      1. Apply battery voltage to both terminals. Check that the pump operates.
      NOTE:
      • These tests must be done within 10 seconds to prevent the coil from burning out.
      • Keep the fuel pump as far away from the battery as possible.
      • Always turn on and off the voltage on the battery side, not the fuel pump side.
      Fig 6: Identifying Fuel Pump Electrical Connector
      G02596886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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