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Fuel System (1MZ-FE/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 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
        G04391411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect SST and the fuel tube connector to the fuel pipe.
        CAUTION: Always read the precautions (see PRECAUTION ) before connecting the fuel tube connector (quick type).
        Fig 2: Connecting SST And Fuel Tube Connector To Fuel Pipe
        G04391412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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)
      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 ).
        Fig 3: Connecting Union And Hose To Injector
        G04391413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.
        8. Fig 4: Connecting SST To Injector And Battery
        G04391414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      SST 09842-30070

      Standard: 

      INJECTION VOLUME - REFERENCE TABLE

      Injection Volume Difference Between Each Injector
      60 to 73 cm3 (3.7 to 4.5 cu in.) per 15 seconds 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
      G04391415Courtesy 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 the terminals. Check that the pump operates.
    NOTE:
    • These tests must be done within 10 seconds to prevent the coil from burning out.
    • Keep 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 Connector Terminals
    G04391416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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