4. Fuel Injection System
4-28
Fuel Injector
Injector r
esistance confirmation
Injection-state
atomizing good
Injection-state unusual
Functional Description:
● Powered by DC 8~16V, and has two-pin socket on the injector.
● Its major component is the solenoid valve of high resistance driven by
electronic current.
● The two terminals are connected to power source and ground
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.
Detection judge:
1. Between the two pin resistance values: 11.7±0.6Ω
2. injection state:
● Fuel atomizing good, with a clear scattering angle → judged as
normal.
● Injection-state such as water, no obvious scattering angle → found
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
injector.
● Fuel pressure shortage → confirmed hydraulic pressure, the
proposed replacement fuel pump to confirm.
Warning
● Gasoline is lower ignited explosive materials, in the ventilation
premises operations, and prohibited fire.
● In the inspection injector fuel injection state, the outflow of gasoline,
and the application of appropriate collection containers, so as to
avoid danger.
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