Fuel System (1MZ-FE/3MZ-FE): Inspection

INSPECT FUEL INJECTOR ASSY

Check the injector resistance.
1. Measure the resistance between the terminals.
  Standard: 13.4 to 14.2 Ω at 20°C (68°F)
  
  If the result is not as specified, replace the injector.

Check the injector injection.

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.

Purchase the new fuel tube and take out the fuel tube connector from its pipe.
Fuel tube: Parts No. 23801-20190

Fig 1: Identifying Fuel Tube Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Connect SST and the fuel tube connector to the fuel pipe.
CAUTION: Always read the precautions (see PRECAUTION ) before connecting the fuel tube connector (quick type).

Fig 2: Connecting SST And Fuel Tube Connector To Fuel Pipe
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install the O-ring to the injector.
Connect SST (union and hose) to the injector, and hold the injector and the union with SST (clamp)
Put the injector into a graduated cylinder.
HINT:

Install a suitable vinyl tube onto the injector to contain the gasoline spray.
Operate the fuel pump (see ON-VEHICLE INSPECTION ).

Fig 3: Installing O-Ring To Injector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard:

INJECTION VOLUME AND DIFFERENCE BETWEEN EACH INJECTOR

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

NOTE: Always turn on and off the voltage on the battery side, not the fuel pump side.

If the injection volume is not as specified, replace the injector.

Fig 4: Connecting SST (Wire) To Injector And Battery

Check fuel 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 per 12 minutes
  
  Fig 5: Checking Fuel Leakage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT FUEL PUMP
1. Check the fuel pump resistance.
  1. Measure the resistance between the terminals.
    Standard: 0.2 to 3.0 Ω at 20°C (68°F)
2. Check fuel pump operation
  1. Apply battery voltage to both the terminals. Check that the pump operates.
  Fig 6: Identifying Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - These tests must be done within 10 seconds to prevent the coil from burning out.
  - Keep fuel pump as far away from the battery as possible.
  - Always turn on and off the voltage on the battery side, not the fuel pump side.