Fuel System (3MZ-FE): Inspection

INSPECT FUEL INJECTOR ASSY
1. Inspect injector resistance
  1. Using an ohmmeter, measure the resistance between the terminals.
    Resistance: 13.4 to 14.2 Ω at 20°C (68°F)
    
    If the resistance is not as specified, replace the injector.
2. Inspect injector operation
  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. Pull out the connector from a new fuel tube.
    HINT:
    
    Part No. 23801 - 20180
    
    Fig 1: Identifying Fuel Tube Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Connect SST and the fuel tube connector to the fuel pipe.
    SST 09268-41047 (95336-08070)
    
    CAUTION: After taking the precaution, connect the fuel tube connector (quick type).
    
    Fig 2: Identifying SST And Fuel Tube Connector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Install the grommet and O-ring to the injector.
  4. Connect SST (union and hose) to the injector, and hold the injector and the union with SST (clamp)
    SST 09268-41047 (09268-41110, 09268-41300, 95336-08070)
  5. Put the injector into a graduated cylinder.
    HINT:
    
    Install a suitable vinyl tube onto the injector to contain the gasoline spray.
  6. Operate the fuel pump. (See ON-VEHICLE INSPECTION )
    
    Fig 3: Installing Grommet And O-Ring To Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. 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 09842-30070
    
    Injection volume:
    
    Fig 4: Connecting SST To Injector
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: Always do the switching at the battery side.
    
    If the injection volume is not as specified, replace the injector.
    
    Fig 5: Injection Volume Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect leakage
  1. In the condition above, disconnect the test 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 6: Inspecting Fuel Leakage
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL PUMP
1. Inspect fuel pump resistance.
2. Using an ohmmeter, measure the resistance between the terminals.
  Resistance: 0.2 to 3.0 Ω at 20°C (68°F)
3. Inspect fuel pump operation
4. Apply battery voltage to both the terminals. Check that the pump operates.
6. These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
7. Keep fuel pump as far away from the battery as possible.
8. Always do the switching at the battery side.
  
  Fig 7: Identifying Fuel Pump Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002