1998 · FUEL [13] · страница 79 из 104 · Открыть оригинал PDF ↗

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INJECTORS

7Fu1472

Engine control unit connector

OPERATION

The injectors are electromagnetic-valve-
equipped injection nozzles that function to
inject fuel based upon injection signals from
the engine control unit
Because the surface area of the injection ports
is fixed and because the pressure ofthefuel
relative to the pressure within the manifold is
also regulates to a fixed pressure, the amount
of fuel injection by injectors is determined by

the length of time that the needle valve is
open, Or, in other words, by the length of time
of current flow to the solenoid coil,
Battery power supply is supplied, by way of
the' controlrelay,to the injectors. When the
engine control unit switches ON the power
transistor within the unit and current flows to
the solenoid coil, the injectors open and fuel is
injected:

TROUBLESHOOTING HINTS

Hint 1: If there is a problem with starting while the
engine is warm, perform the combustion
test and check for leakage of the injectors

Hint 2: If the engine can't be started, and the
injectors are not activated during cranking;
the cause is probably a malfunction such as
described below; not with the injectors:

(1)Malfunction of the circuit for supply of
power to the engine control unit, Or of
the earth circuit
Malfunction of the control relay:
Malfunction of the crank angle sensor:

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