Fuel Injector - Sym Wolf SB 250 Ni Service Manual

3. Fuel Injection System

Fuel injector

Injector resistance
measurement
good injection
abnormal injection
3-26
Function Description:
Powered by 8-16V DC from ECU. Fuel pump has a two-pin
●
socket.
Its major component is a high resistance voltage driven solenoid
●
valve.
The two pins are power supply and grounding. Fuel injector is
●
controlled by ECU to decide the injection timing, and the injector
pulse width.
Testing Procedures:
Resistance test
1.
Use the "Ohmmeter" Ohm stalls to inspect the injector resistance.
Injector injection state check
2.
Remove injector fix bolts, but do not disconnect the coupler.
Hold injector and injector cap with hand, no leak should happen.
Key-on and start the engine; inspect the injecting state.
Detection judge:
Resistance between the two pins:
1.
Injection state
2.
Good fuel atomizing, with a clear scattering angle → judged as
●
normal.
Injection-state resembles water drop, no obvious scattering
●
angle → judged as abnormal.
Treatment of abnormal phenomena:
Resistance NG→ abnormal injector, it is recommended to replace
1.
with a new one.
Abnormal injection state, reasons:
2.
Clogged injector→ abnormal injector, it is recommended to
●
replace with a new one.
Insufficient fuel pressure→ check fuel pressure, it is
●
recommended to replace with a new one and recheck.
Warning
Fuel is highly flammable and explosive. Work in a
●
well-ventilated place, no flame or spark allowed.
Properly store the fuel injected by injector while conducting
●
test.
10.5±0.53Ω