Kawasaki STX-15F service manual Injector Resistance Inspection, Injector Unit Test

FUEL SYSTEM (DFI) 3-49

Fuel Injectors (Service Code/Character-41, 42, 43, 44/InJ1, InJ2, InJ3, InJ4)

•Remove connectors for injector [A].

•Connect each test light set [B] to the injector harness con- nector [C].

•Turn the ignition switch ON.

•While cranking the engine with the starter motor, watch the test lights.

If the test lights flicker at regular intervals, the injector circuit in the ECU, and the wiring are good. Perform the “Injector Resistance Inspection”.

○Injector signals can be also confirmed by connecting the hand tester (× 10 V AC) instead of the test light set to the injector harness (female) connector. Crank the en- gine with the starter motor, and check to see if the hand oscillates at regular intervals.

Special Tool - Hand Tester: 57001-1394

If the test light doesn’t flicker (or the test hand doesn’t oscillates), check the wiring and connectors again. If the wiring is good, check the injector voltage.

Injector Resistance Inspection

•Remove the delivery pipe assembly.

•Disconnect the connector from the injector [A].

•Measure the injector resistance with the hand tester [B].

Special Tool - Hand Tester: 57001-1394

Injector Resistance

Standard: about 11.7 ∼ 12.3 Ω @20°C (68°F)

If the reading is out of the range, perform the “Injector Unit Test”.

If the reading is normal, perform the “Injector Unit Test” for confirmation.

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]

CAUTION

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.