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Section 148 (Engine Fuel System): Inspection

WARNING: This page is about a different car, the 2004 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUEL INJECTOR ASSEMBLY 
    1. Inspect injector resistance
      1. Using an ohmmeter, measure the resistance between the terminals.

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

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

    2. Inspect injector operation.
      CAUTION: This test involves high-pressure fuel and electricity. Take every precaution regarding safe handling of both the fuel and the electricity. Preform this test in a safe area, and avoid any sparks or flame. Do not smoke.
      1. Obtain new No. 1 fuel pipe (part No. 23801 -20171) and remove the fuel tube connector from the pipe.
        Fig 1: Identifying Fuel Tube Connector
        G03061976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Install the fuel tube connector to SST (hose), then connect the tube connector and the fuel pipe.

        SST 09268-41047 (95336-08070)

        Fig 2: Installing Fuel Tube Connector To SST (Hose)
        G03061977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        CAUTION: Connect the fuel tube connector (quick type) after observing the precautions.
      3. Install the grommet and O-ring to the injector.
        4. Fig 3: Installing Grommet And O-Ring To Injector
        G03061978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Connect SST (union and hose) to the injector, and hold the injector and the union with SST (clamp)

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

      5. Put the injector into a graduated cylinder.
        CAUTION: Install a suitable vinyl tube onto the injector to contain 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. Perform this test on each injector 2 or 3 times.

      SST 09842-30070

      Injection volume: 

      INJECTOR VOLUME SPECIFICATION

      Injection volume Difference between each injector
      60 to 73 cm3 (3.7 to 4.5 cu in.) in 15 seconds 13 cm3 (0.8 cu in.) or less
      Fig 4: Measuring Injection Volume With A Graduated Cylinder
      G03061979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: Always do the switching at the battery side.

      If the injection volume is not as specified, replace the injector.

    3. Inspect 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 in 12 minutes 

  2. INSPECT FUEL PUMP 
    1. Inspect fuel pump resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.
      Fig 5: Identifying Terminals
      G03061981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    2. Inspect fuel pump operation
      1. Apply battery voltage to both the terminals. Check that the pump operates.
    NOTE:
    • These tests must be done quickly (within 10 seconds) to prevent damage to the pump.
    • Keep fuel pump as far away from the battery as possible.
    • Always do the switching at the battery side.
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