Injector Unit Test
Use two leads [A] and the same test light set [B] as in
"Injector Signal Test".
Rating of Bulb [C]: 12 V × (3 ∼ 3.4) W
12 V Battery [D]
Be sure to connect the bulb in series. The bulb
works as a current limiter to protect the solenoid
in the injector from excessive current.
Connect the test light set to the injector [E] as shown.
Open and connect [F] the end of the lead to the battery
(–) terminal repeatedly. The injector should click.
If the injector does not click, replace the injector.
If the injector clicks, check the wiring again. If the wiring
is good, replace the injector (may be clogged) or ECU.
Injector Fuel Line Inspection
Fuel Tank (see Fuel Removal)
Be sure to place a piece of cloth around the fuel hose joint
and the delivery pipe.
Insert a minus screw driver [A] into the slit on the joint lock
Turn the driver to disconnect the joint lock.
Pull the fuel hose joint [C] out of the delivery pipe.
Check the injector fuel line for leakage as follows:
Connect a commercially available vacuum/pressure
pump [A] to the nipple of the delivery pipe [B] with a
high-pressure fuel hose [C] (both ends connected with
the clamps [D]) as shown.
Torque - Fuel Hose Clamp Screws: 1.5 N·m (0.15 kgf·m, 13
Apply soap and water solution to the areas [E] as shown.
Watching the pressure gauge, squeeze the pump lever
[F], and build up the pressure until the pressure reaches
the maximum pressure.
Injector Fuel Line Maximum Pressure
333 kPa (3.4 kgf/cm², 48 psi)
During pressure testing, do not exceed the maxi-
mum pressure for which the system is designed.
Watch the gauge for at least 6 seconds.
If the pressure holds steady, the system is good.
If the pressure drops at once or if bubbles are found in
the area, the line is leaking. Replace the delivery pipe,
injectors and related parts.
Repeat the leak test, and check the fuel line for no leak-
Install the pump outlet hose (see Fuel Tank Installation).
Run the hoses correctly (see Cable, Wire, and Hose Rout-
ing section in the Appendix chapter).
FUEL SYSTEM (DFI) 3-91