Fuel Injector: Testing and Inspection

3MZ-FE FUEL INJECTOR:

INSPECTION

1. INSPECT FUEL INJECTOR ASSEMBLY
(a) Check the injector resistance.
(1) Measure the resistance between the terminals.
Standard:
13.4 to 14.2 Ohms at 20°C (68°F)
If the result is not as specified, replace the injector.
(b) 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.





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

CAUTION: Always read the precautions (Service Precautions) before connecting the fuel tube connector (quick type).

(2) Install the O-ring to the fuel injector.





(3) Connect SST (adapter and hose) to the injector, and hold the injector and union with SST (clamp).
SST: 09268-31012
09268-41110
09268-41300
90467-13001
(4) Put the injector into the graduated cylinder.

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

(5) Operate the fuel pump (Testing and Inspection).





(6) 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:





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

If the result is not as specified, replace the injector.
(c) 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
(d) Turn the ignition switch off.
(e) Disconnect the cable from the negative (-) battery terminal.

NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Repair Instruction - Initialization).

(f) Remove the SST.
(g) Disconnect Techstream from the DLC3.
(h) Reconnect the fuel inlet hose (rear fuel pipe) to the fuel main tube.