Fuel Injector - Sym RV 250i Service Manual

4. Fuel Injection System

Fuel Injector

Injector r
esistance confirmation
Injection-state
atomizing good
Injection-state unusual
4-28
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Functional Description:
Powered by DC 8~16V, and has two-pin socket on the injector.
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Its major component is the solenoid valve of high resistance driven by
●
electronic current.
The two terminals are connected to power source and ground
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respective. It is controlled by ECU to decide the injection timing, and
the injector pulse width.
Testing Procedures:
1. Resistance Confirmation:
Use of the "meter" Ohm stalls (Ω), measurement of the injector
resistance value.
2. Injector injection state examination:
Removed the injector fixed bolt and removed the injector from intake
●
manifold, but not removal of harness coupler.
Injector and injector cap tightly by hands, fuel spills should not be
●
the case.
Key-on and start the engine, injector injection state examination.
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Detection judge:
1. Between the two pin resistance values:
2. injection state:
Fuel atomizing good, with a clear scattering angle → judged as
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normal.
Injection-state such as water, no obvious scattering angle → found
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abnormal.
Treatment of abnormal phenomena:
1. Injector abnormal, the proposed replacement of the new one injector.
2. Injection-state abnormal, for the following reasons:
Injector obstructive→the proposed replacement of the new one
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injector.
Fuel pressure shortage → confirmed hydraulic pressure, the
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proposed replacement fuel pump to confirm.
Warning
Gasoline is lower ignited explosive materials, in the ventilation
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premises operations, and prohibited fire.
In the inspection injector fuel injection state, the outflow of gasoline,
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and the application of appropriate collection containers, so as to
avoid danger.
11.7±0.6Ω