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Fuel Injectors (Sienna)

  1. To check for injector operation, remove "V" bank cover on top of engine for access to fuel injectors. See Figure. Using stethoscope, listen for clicking sound at each fuel injector or use your finger to feel for fuel injector operation at fuel injector with engine cranking or with engine running. If fuel injector operation does not exist, check for loose connection at fuel injector electrical connector. If fuel injector electrical connector is okay, go to next step.
  2. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, check resistance between electrical terminals on fuel injector. Replace fuel injector if resistance is not 13.4-14.2 ohms at 68°F (20°C).
  3. If fuel injector operates and fuel injector resistance is within specification, go to next step. If fuel injector resistance is within specification but fuel injector does not operate, check wiring circuit to fuel injector. See appropriate wiring diagram in WIRING DIAGRAMS article. If problem exists in fuel injector or wiring circuit and misfire exists, a Diagnostic Trouble Code (DTC) may be stored in Engine Control Module (ECM). See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
  4. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Fuel injector is connected to fuel filter for checking fuel injector volume.
  5. Ensure area around fuel hose and outlet on top of fuel filter is clean. Remove union bolt 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 Fig 1. Tighten union bolt to 22 ft. lbs. (30 N.m).
    Fig 1: Connecting Fuel Injector Test Equipment (Sienna)
    G98J11477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. 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 delivery hose. See Fig 1.
  7. Place vinyl tube on end of fuel injector to prevent fuel spillage. Place fuel injector into a clean graduated container.
  8. Connect scan tool to data link connector No. 3. See Figure. 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 (AVALON, CAMRY, CAMRY SOLARA, LAND CRUISER, SIENNA, TACOMA & 4RUNNER)  under FUEL DELIVERY under FUEL SYSTEMS.
  9. 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. Ensure difference between fuel injector volume on all fuel injectors is within specification. See FUEL INJECTOR VOLUME SPECIFICATIONS  table.
  10. 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.
  11. 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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