Fuel Injector: Inspection

INSPECT FUEL INJECTOR ASSEMBLY
1. Inspect injector resistance.
  1. Measure the resistance between the 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: Removing O-Ring From Each Fuel Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the injection volume.
  NOTE:
  - 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 flames. Do not smoke.
  1. Connect SST (fuel tube connector) to SST (hose), then connect them to the fuel tube (vehicle side).
    SST 09268-31012 (09268-41500, 90467-13001, 95336-08070)
    
    Fig 2: Connecting Fuel Tube Connector To SST Hose
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Install the O-ring to the fuel injector.
  3. Connect SST (adaptor and hose) to the injector, and hold the injector and union with SST (clamp).
    SST 09268-31012 (09268-41130, 09268-41400, 90467-13001, 95336-08070)
  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.
    
    Fig 3: Connecting SST Adaptor And Hose To Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 volume:
    
    84 to 100 cc (5.1 to 6.1 cu in.) in 15 seconds
    
    Difference between each injector:
    
    16 cc (1.0 cu in.) or less
    
    Fig 4: 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. Inspect the fuel leakage.
  1. In the condition above, disconnect the tester probes of SST (wire) from the battery and check for the fuel leakage from the injector.
    Fuel drop:
    
    1 drop or less per 16 minutes
    
    Fig 5: Checking Fuel Leakage From Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002