Fuel Injector: Testing and Inspection

1NZ-FE FUEL: FUEL INJECTOR: INSPECTION

INSPECTION

1. INSPECT FUEL INJECTOR ASSEMBLY





(a) Check the resistance.
(1) Using an ohmmeter, measure the resistance between the terminals.
Standard resistance:
11.6 to 12.4 Ohms at 20°C (68°F)
If the result is not as specified, replace the injector assembly.
(b) Check the operation.
CAUTION: Perform the inspection in a well-ventilated area.
Do not perform the inspection near any naked flames.




(1) Connect SST (fuel tube connector) to SST (hose), then connect them to the fuel pipe (vehicle side).
SST: 09268-31012
90467-13001
95336-08070
09268-41500
(2) Install the O-ring onto the fuel injector assembly.




(3) Connect SST (adaptor and hose) to the injector assembly, and hold the injector assembly and union with SST (clamp).
SST: 09268-31012
09268-41110
90467-13001
95336-08070
09268-41310
(4) Set the injector assembly in a graduated cylinder.
CAUTION: Install a suitable vinyl tube onto the injector assembly to prevent gasoline splashes.
(5) Operate the fuel pump Testing and Inspection.




(6) Connect SST (wire) to the injector assembly and the battery for 15 seconds, and measure the injection volume with the graduated cylinder. Test each injector 2 or 3 times.
SST: 09842-30080
Injection volume:
47 to 58 cm3 (2.9 to 3.5 cu in.) per 15 seconds
Difference between each injector:
11 cm3 (0.6 cu in.) or less
NOTE: Always do the switching at the battery side.

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





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