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Home >> Toyota >> 1995 >> T100 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 3.4L >> Fuel System >> Fuel Control >> Fuel Injectors
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Fuel Injectors

  1. Ensure ignition is off. Disconnect electrical connector at fuel injector. Using ohmmeter, measure resistance between fuel injector electrical terminals. Replace fuel injector if resistance is not within specification. See FUEL INJECTOR RESISTANCE SPECIFICATIONS  table.
  2. To check fuel injector spray pattern and volume, remove fuel injector. See the REMOVE/INSTALL/OVERHAUL article. Disconnect fuel hose from fuel filter outlet. Use Delivery Hose (09268-41045) to install fuel injector between fuel filter and fuel pressure regulator. See Fig 1 and Fig 2.
  3. Place fuel injector into a clean graduated container. Place vinyl tube on end of fuel injector to prevent fuel spillage.
    NOTE: Scan tester is used to operate the fuel pump or by applying battery voltage to electric fuel pump.
  4. Use scan tester to operate the fuel pump or apply battery voltage to electric fuel pump to pressurize the fuel system. See FUEL PRESSURE in the BASIC TESTING - 3.4L article.
  5. Connect fuel injector tester to fuel injector for 15 seconds. Use Fuel Injector Tester (09842-30070).
  6. Measure fuel injector volume and check spray pattern. Test each fuel injector 2-3 times. Replace fuel injector if volume is not as specified. See the 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.
  7. Disconnect fuel injector tester. Ensure fuel leakage from end of fuel injector is one drop or less in specified time. See the FUEL INJECTOR LEAKAGE SPECIFICATIONS  table. Replace fuel injector if leakage exceeds specified amount.
FUEL INJECTOR RESISTANCE SPECIFICATIONS

Application Ohms @ 68°F (20°C)
3.4L 13.8
FUEL INJECTOR VOLUME SPECIFICATIONS

Application Cu. In. (cc)
3.4L 3.4-4.2 (56-69)
Maximum Difference Between Each Fuel Injector .4 (6)
FUEL INJECTOR LEAKAGE SPECIFICATIONS

Application Leakage Time
T100 1 Minute
Fig 1: Connections For Testing Fuel Injector
G95I33686Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Connecting Fuel Injector Tester
G95J33687Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: Fuel pressure control system may also be referred to as fuel pressure-up system.
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