Fuel System (3MZ-FE): Inspection

INSPECT FUEL INJECTOR ASSY

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.

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.

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

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: Connecting SST And Fuel Tube Connector To Fuel Pipe
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Install the grommet and O-ring to the injector.
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)

Put the injector into a graduated cylinder.

HINT:

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

Fig 3: Connecting SST (Union And Hose) To Injector And Hold Injector And Union With SST (Clamp)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Operate the fuel pump. (See ON-VEHICLE INSPECTION )

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

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Injection volume:

INJECTION VOLUME SPECIFICATIONS

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 do the switching at the battery side.

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

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 5: 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)
2. Inspect fuel pump operation
  1. Apply battery voltage to both the terminals. Check that the pump operates.
    NOTE:
    These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
    
    Keep fuel pump as far away from the battery as possible.
    
    Always do the switching at the battery side.
    Fig 6: Identifying Fuel Pump Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002