Fuel Injector: Inspection

INSPECT FUEL INJECTOR ASSEMBLY
1. Measure the resistance between the injector terminals.
  Standard resistance:
  
  11.6 to 12.4 Ω at 20°C (68°F)
  
  If the result is not as specified, replace the injector.
  
  Fig 1: Measuring Resistance Between Injector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the injector injection volume.
  CAUTION:
  - This test involves high-pressure fuel and electricity.
  - Take every precaution regarding safe handling of both the fuel and the electricity.
  - Perform this test in a safe area, and avoid any sparks or flame.
  - Do not smoke.
  1. Connect SST (fuel tube connector) to SST (hose), then connect them to the fuel pipe (vehicle side).
    SST 09268-31012 (09268-41500, 90467-13001, 95336-08070)
    
    Fig 2: Connecting SST To Fuel Pipe
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    CAUTION: Always read the precautions (See PRECAUTION ) before connecting the fuel tube connector (quick type).
  2. Install the O-ring to the fuel injector.
  3. Connect SST (adapter and hose) to the injector, and hold the injector and union with SST (clamp).
    SST 09268-31012 (09268-41110, 09268-41300,90467-13001)
    
    Fig 3: Connecting SST (Adapter And Hose) To Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Put the injector into the graduated cylinder.
    CAUTION: Install a suitable vinyl tube onto the injector to contain gasoline spray.
  5. Operate the fuel pump (See ON-VEHICLE INSPECTION ).
  6. Connect SST (wire) to the injector and the battery for 15 seconds, and measure the injection volume with the graduated cylinder. Test each injector 2 or 3 times.
    SST 09842-30080 Standard injection volume:
    
    76 to 92 cm ³ (4.6 to 5.6 cu in.) per 15 seconds
    
    Standard difference between each injector:
    
    16 cm ³⁶ (1.0 cu in.) or less
    
    NOTE: Always turn on and off the voltage on the battery side, not the fuel pump side.
    
    Fig 4: Connecting SST To Battery
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the fuel leakage.
  1. Disconnect the SST (wire) tester probes from the battery and check the fuel leakage from the injector.
    Standard fuel drop:
    
    1 drop or less per 12 minutes
    
    Fig 5: Identifying Fuel Leakage Of Fuel Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch off.
  3. Disconnect the cable from the negative (-) battery terminal.
  4. Remove the SST.
  5. Disconnect the intelligent tester from the DLC3.
  6. Reconnect the fuel inlet hose (rear fuel pipe) to the fuel main tube.