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Fuel Injectors (Sienna)

  1. Remove "V" bank cover on top of engine for access to fuel injectors. See Figure-4. Ensure ignition is off.
  2. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electric terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. To check fuel injector volume, remove fuel injector. See appropriate REMOVE/INSTALL/OVERHAUL article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  4. Ensure area around fuel hose and outlet on top of fuel filter is clean. Remove union bolts with gaskets, and disconnect fuel hose from outlet at top of fuel filter. Install Union (SST 90405-09015) and delivery hose from Fuel Injector Measuring Kit (SST 09268-41047), gaskets and union bolt on top of fuel filter. See Figure-64. Tighten union bolt to 22 ft. lbs. (30 N.m).
  5. Check that grommet and "O" ring are installed on top of fuel injector. Using Clamp (SST 09268-41100), and adapter from fuel injector measuring kit, connect fuel injector to the delivery hose. See Figure-64.
  6. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  7. Connect scan tool to data link connector No. 3. See Figure-71. Turn ignition on. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate fuel pump.
    NOTE: Fuel pump may also be operated to pressurize fuel system by applying battery voltage to electrical terminals on fuel pump. For operating of fuel pump, see FUEL PUMP RESISTANCE & OPERATION under FUEL DELIVERY  under FUEL SYSTEM.
  8. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. See Figure. Measure fuel injector volume. Test each fuel injector 2-3 times. Replace fuel injector if fuel injector volume is not within specification. See FUEL INJECTOR VOLUME SPECIFICATIONS  table.
    NOTE: Ensure difference between fuel injector volume on all fuel injectors is within specification. See FUEL INJECTOR VOLUME  SPECIFICATIONS table.
  9. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector does not exceed one drop within 12 minutes. Replace fuel injector if leakage exceeds specification. Disconnect negative battery cable. Remove test equipment.
  10. Using NEW gaskets, install fuel hose on top of fuel filter. Tighten union bolt to 22 ft. lbs. (30 N.m). Install negative battery cable. Check for fuel leaks by using scan tool to energize fuel pump.
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