Fuel injector signals can be also confirmed by connect-
ing the tester instead of the test light set to the fuel injec-
tor main harness connector. Crank the engine with the
starter motor, and check to see if the needle oscillates at
If the test light doesn't flicker (or the tester needle doesn't
oscillates), check the wiring and connectors again. If the
wiring is good, the ECU is suspect. Replace the ECU.
Fuel Injector Resistance Inspection
Remove the fuel tank (see Fuel Tank Removal).
Disconnect the connector from the injector (see Fuel In-
Measure the fuel injector resistance with a digital volt-
Fuel Injector Resistance
Connections to Injector
11.7 ∼ 12.3 Ω at 20°C (68°F)
If the reading is out of the range, perform the "Fuel Injector
If the reading is normal, perform the "Fuel Injector Unit
Test" for confirmation.
Fuel Injector Unit Test
Use two wires [A] and the same test light set [B] as in
"Fuel 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 fuel injector from excessive current.
Connect the test light set to the fuel injector [E] as shown
in the figure.
Open and connect [F] the end of the wire to the battery
(–) terminal repeatedly. The fuel injector should click.
If the fuel injector does not click, replace the fuel injector.
If the fuel injector clicks, check the wiring again. If the
wiring is good, replace the fuel injector (may be clogged)
FUEL SYSTEM (DFI) 3-121