Fuel Injector: Testing and Inspection

3MZ-FE FUEL: FUEL INJECTOR:

INSPECTION

1. FUEL INJECTOR ASSEMBLY
(a) Inspect injector resistance.





(1) Using an ohmmeter, measure the resistance between the terminals.
Standard resistance:
13.4 to 14.2 Ohms at 20°C (68°F)
If the resistance is not as specified, replace the injector.
(b) Inspect the injection volume.
CAUTION: This test involves high-pressure fuel and electricity. Take all precautions 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) Connect the fuel tube connector to SST (hose), then connect the tube connector to the fuel pipe (the vehicle side).
SST: 09268-31012
09268-41500
90467-13001
95336-08070
(2) Install the O-ring to the fuel injector.





(3) Connect SST (adaptor and hose) to the injector, and hold the injector and adapter with SST (clamp).
SST: 09268-31012
90467-13001
95336-08070
09268-41110
09268-41300





(4) Put the injector into a graduated cylinder.
CAUTION: Install a strong rubber tube onto the injector to prevent gasoline from splashing.
(5) Operate the fuel pump (turn the ignition switch to the ON position).
(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: 09842-30070
Injection volume:






If the injection volume is not as specified, replace the injector.
(c) Inspect the leakage.





(1) In the condition above, disconnect the tester probes of SST (wire) from the battery and check the fuel leakage from the injector.
Fuel drop:
1 drop or less in 12 minutes