Fuel Injector: Inspection

INSPECT FUEL INJECTOR ASSEMBLY
1. Check the resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Resistance: 11.6 to 12.4 Ω at 20°C (68°F)
    
    If the result is not as specified, replace the fuel injector.
2. Check the injection volume.
  
  Fig 1: Measuring Resistance Between Fuel Injector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  CAUTION: This test involves high-pressure fuel and electricity, therefore, safety precautions should be taken. Perform this test in a safe area and avoid any sparks and flames. Do not smoke.
  1. Discharge the fuel system pressure (see PRECAUTION ).
  2. Remove the fuel hose from the fuel pressure pulsation damper (see REMOVAL ).
  3. Remove the fuel hose from the fuel pipe (see FUEL SYSTEM ).
  4. Separate the pressure regulator (see FUEL PRESSURE REGULATOR ).
    NOTE: Do not separate the fuel hose No.2.
  5. Assemble SST as shown in Fig 2.
    SST 09268-41048 (09268-41091, 09268-41110, 09268-41120, 09268-41500, 95336-08070, 90467-13001)
    
    Fig 2: Identifying SST
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Connect SST to the fuel pipe.
    SST 09268-41048 (09268-41500, 90467-13001)
    
    Fig 3: Connecting SST To Fuel Pipe
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Install the pressure regulator onto SST (union) with the 2 bolts.
    Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf)
    
    SST 09268-41048 (09268-41091)
    
    NOTE: Make sure that the O-ring is installed onto the pressure regulator.
    
    Fig 4: Installing Pressure Regulator Onto SST (Union) With Bolts
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Install the O-ring onto the injector.
  9. Assemble SST as shown in Fig 5.
    SST 09268-41048 (09268-41110, 09268-41310)
  10. Put the injector into a graduated cylinder.
    CAUTION: Install a suitable vinyl tube onto the injector to contain any gasoline spray.
    
    Fig 5: Identifying SST
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. Make sure that SST is installed as shown in Fig 6.
  12. Operate the fuel pump (see ON-VEHICLE INSPECTION ).
    
    Fig 6: Installing SST
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. Connect SST (wire) to the injector and the battery for 15 seconds, and measure the injection volume with a graduated cylinder. Test each injector 2 or 3 times.
    SST 09842-30080
    
    Volume: 71 to 86 cm ³ (4.3 to 5.2 cu in.) per 15 seconds
    
    Difference between each
    
    injector: 15 cm ³ (0.9 cu in.) or less
    
    If the injection volume is not as specified, replace the injector.
    
    Fig 7: Connecting SST (Wire) To Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the leakage.
  1. In the condition above, disconnect the tester probes of SST (wire) from the battery and check the fuel leakage from the injector.
    Fuel drop: 1 drop or less in 12 minutes
    
    Fig 8: Checking Leakage
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002