Engine Fuel System: Inspection

INSPECT FUEL INJECTOR ASSY
1. Inspect injector 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 resistance is not as specified, replace the injector.
2. Inspect the 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 flames. Do not smoke.
  1. Install the fuel tube connector to SST (hose), then connect the tube connector to the fuel pipe (vehicle side).
    SST 09268-41048 (95336-08070, 09268-41500)
    
    Fig 1: Installing Fuel Tube Connector To SST (Hose), Then Connect Tube Connector To Fuel Pipe (Vehicle Side)
    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 09268-41048 (09268-41130, 90467-13001), 09268-41400
  4. Put the injector into the graduated cylinder.
    CAUTION: Install a suitable vinyl tube onto the injector to contain gasoline spray.
    
    Fig 2: Installing O-Ring To Fuel Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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
    
    Volume: 84 to 100 cm ³ (5.1 to 6.0 cu in.) in 15 seconds Difference between each injector:
    
    16 cm ³ (0.96 cu in.) or less
    
    If the injection volume is not as specified, replace the injector.
    
    Fig 3: Connecting SST (Wire) To Injector & Battery For 15 Seconds, & Measure Injection Volume With Graduated Cylinder
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check for leakage.
  1. In the condition above, disconnect the tester probes of SST (wire) from the battery and check for fuel leakage from the injector.
    Fuel drop: 1 drop or less in 16 minutes
    
    Fig 4: Checking Fuel Leakage From Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL PUMP
1. Inspect fuel pump resistance.
  1. Using an ohmmeter, measure the resistance between the terminals.
    Resistance: 0.2 to 3.0 Ω at 20°C (68°F)
    
    If the result is not as specified, replace the fuel pump assy.
2. Inspect fuel pump operation.
  1. Apply battery voltage to both the terminals. Check that the pump operates.
    
    Fig 5: Applying Battery Voltage To Both Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    These tests must be done quickly (within 10 seconds) to prevent damage to the pump.
    
    Keep fuel pump as far away from the battery as possible.
    
    Always switch at the battery side.
    If the pump does not operate, replace the fuel pump assy.