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Fuel Injectors

  1. Ensure ignition is off.
  2. Disconnect electrical connector at fuel injector. Using ohmmeter, measure resistance between electric terminals on fuel injector. Replace fuel injector if resistance is not 13.8 ohms at 68°F (20°C).
  3. To check fuel injector volume, remove fuel injector. See FUEL RAILS & FUEL INJECTORS under FUEL SYSTEM in REMOVE/INSTALL/OVERHAUL - 3.4L article.
    NOTE: Fuel injector is connected between fuel pressure regulator on the delivery pipe and fuel inlet pipe.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 3) to step 5). No test procedures have been omitted.
  4. Disconnect fuel line from fuel inlet pipe and use Delivery Hose (09268-41046) to install fuel injector between fuel pressure regulator on delivery pipe and fuel inlet pipe. See Fig 1.
  5. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
  6. Use scan tool to operate the fuel pump to pressurize the fuel system. See FUEL PRESSURE under FUEL SYSTEM in BASIC TESTING - 3.4L article.
    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.
  7. Connect Fuel Injector Tester (09842-30070) to fuel injector for 15 seconds. See Fig 2. 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.
  8. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector is one drop or less per one minute. Replace fuel injector if leakage exceeds specification. Remove test equipment.
FUEL INJECTOR VOLUME SPECIFICATIONS

Application (1) Cu. In. (cc)
3.4L 3.3-4.3 (55-70)
(1) Maximum difference between each fuel injector is .4 cu. in. (6 cc).
Fig 1: Connections For Testing Fuel Injector
G97F06486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Connecting Fuel Injector Tester
G95J33687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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