Fuel System (3MZ-FE): Inspection

1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.

   Standard: 

   TERMINALS CONNECTION-CONDITION
   
   

   Tester Connection	Specified Condition
   1-2	13.4 to 14.2 Ω at 20° C (68° F)

   If the resistance is not as specified, replace the fuel injector.

2. Check the operation.
   CAUTION:

   • This test involves high-pressure fuel and electricity. Keep the injector free of sparks during the test.
   • Take every precaution regarding safe handling of both the fuel and electricity.
   • Perform this test in a safe area, and avoid any sparks or flame.
   • Do not smoke.
   1. Pull out the fuel tube connector from a new fuel tube.

      HINT:

      Part No. 23801 - 20190

      Fig 1: Locating Fuel Tube Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect SST and the fuel tube connector to the fuel pipe.
      1. SST 09268-41047 (95336-08070)
      CAUTION: After taking the precautions, connect the quick connector.
      Fig 2: Connecting SST & Fuel Tube Connector To Fuel Pipe

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Install the grommet and O-ring to the fuel injector.
   4. Connect SST (a union and hose) to the fuel injector, then hold the fuel injector and union with SST (a clamp).
      1. SST 09268-41047 (09268-41110, 09268-41300, 95336-08070)
   5. Put the fuel injector into a graduated cylinder.

      HINT:

      Install a suitable vinyl tube to the fuel injector to contain the gasoline spray.

      Fig 3: Installing Grommet & O-Ring To Fuel Injector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   6. Operate the fuel pump (see ON-VEHICLE INSPECTION  ).
   7. Connect SST (a wire) to the fuel injector and battery for 15 seconds, then measure the injection volume with the graduated cylinder. Test each fuel injector 2 or 3 times.
   1. SST 09842-30070

   Standard: 

   INDICTOR VOLUME TESTING
   
   

   Injection Volume	Difference between Cylinders
   60 to 73 cm3 (3.7 to 4.5 cu in.) per 15 seconds	13 cm3 (0.8 cu in.) or less

   Fig 4: Measuring Injector Volume

   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 fuel injector.

3. Inspect the leakage.
   1. In the condition of step  7, disconnect the test probes of SST (a wire) from the battery, then check the fuel leakage from the fuel injector.
      1. Fuel drop: 1 drop or less per 12 minutes 

      If the fuel drop is not as specified, replace the fuel injector.

      Fig 5: Inspecting Leakage

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Inspect the resistance.
   1. Using an ohmmeter, measure the resistance between the terminals.

   Standard: 

   TERMINALS CONNECTION-CONDITION
   
   

   Tester Connection	Specified Condition
   1-2	0.2 to 3.0 Ω at 20° C (68° F)

   If the resistance is not as specified, replace the fuel pump.

   Fig 6: Measuring Resistance Between Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the operation.
   1. Apply battery positive voltage across the terminals.
   2. Check that the fuel pump operates.
   NOTE:

   • These tests must be performed quickly (within 10 seconds) to prevent burnout of the coil.
   • Keep the fuel pump as far away from the battery as possible.
   • Always do the switching at the battery side.
   Fig 7: Checking Fuel Pump Operations

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the operation is not as specified, replace the fuel pump.