Fuel Injector: Inspection

INSPECT FUEL INJECTOR ASSEMBLY
1. Inspect the injector resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Standard resistance:
    
    13.4 to 14.2 Ω at 20°C (68°F)
    
    If the resistance is not as specified, replace the injector.
2. Inspect the injector.
  CAUTION: Avoid any sparks or flame during the test.
  
  Fig 1: Identifying Fuel Injector Assembly Parts
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Obtain a new fuel main hose (part No. 23271-50190) and take the fuel tube connector out of the hose.
    
    Fig 2: Identifying Fuel Tube Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Install the fuel tube connector to SST (hose), then connect the tube connector and fuel pipe.
    SST 09268-31011 (95336-08070)
    
    CAUTION: Observe the precautions when connecting the fuel tube connector (quick type).
  3. Remove the pressure regulator from the delivery pipe.
  4. Install the O-ring to the fuel inlet of the pressure regulator.
    
    Fig 3: Identifying Fuel Tube Connector, SST (Hose) And Fuel Pipe
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Connect the SST (hose) to the fuel inlet of the pressure regulator with another SST (union) and the 2 bolts.
    SST 09268-31011 (95336-08070, 09268-41091)
    
    Torque: 7.5 N*m (80 kgf*cm, 66 in.*lbf)
  6. Connect the fuel return hose to the fuel outlet of the pressure regulator.
    
    Fig 4: Identifying Pressure Regulator
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Install the O-ring to the injector.
  8. Connect SSTs (union and hose) to the injector, and hold the injector and union with another SST (clamp).
    SST 09268-31011 (09268-41110, 09268-41300, 95336-08070)
  9. Put the injector into a graduated cylinder.
    CAUTION: Install a suitable vinyl tube onto the injector to prevent gasoline from splashing out.
    
    Fig 5: Identifying Injector And Union
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. Operate the fuel pump (See ON-VEHICLE INSPECTION ).
  11. Connect SST (wire) to the injector and battery for 15 seconds, and measure the injection volume with the graduated cylinder. Test each injector 2 or 3 times.
    SST 09842-30070
    
    Volume:
    
    56 to 69 cm ³ (3.4 to 4.2 cu in.) per 15 seconds
    
    Difference between each injector:
    
    13 cm ³ (0.8 cu in.) or less
    
    Fig 6: Connecting SST (Wire) To Injector And Battery
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If the injection volume is not as specified, replace the injector.
3. Check for leakage.
  1. In the condition above, disconnect the tester probes of the SST (wire) from the battery and check for fuel leakage from the injector.
    SST 09842-30070
    
    Fuel drop:
    
    1 drop or less per 12 minutes
    
    Fig 7: Checking For Fuel Leakage From Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002