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BAROMETRIC PRESSURE SENSOR
FS020A
This sensor is located inside the ECU and is part of the
ECU unit. Its purpose is to sense atmospheric pressure.
From this information, the ECU determines the correct
fuel/air mixture ratio.
NOTE: This sensor is not replaceable. If it should
fail, the ECU must be replaced.
FUEL INJECTORS
FS021
The fuel injectors are positioned in the top of each
throttle body. O-rings seal the top and bottom of each
injector, and they are held in position by a locking
plate secured to the fuel rail.
FS022A
The fuel injector is an electromagnetic injection valve
controlled by a signal from the ECU. The coil used in
the injector is a high-pressure resistance type. The
ECU determines the optimum fuel injection time and
duration based on signals from the five sensors.
When voltage is sent to the fuel injector, it energizes
the coil and opens the needle valve, thereby injecting
fuel. Because the fuel pressure (pressure differential
between fuel line and manifold) is kept constant, the
amount of fuel injected is determined by the duration
of time the valve is open.
The injectors are coded with symbols (
Q
-
O
-
V
) and are
color-coded yellow and green. When replacement of a
fuel injector is necessary, the injector must be replaced
with an injector of the same code symbol and color.
FS025A
NOTE: A green-coded injector is for the 600 cc
EFI STD model; the yellow-coded injector is for all
remaining EFI models.
FUEL PRESSURE REGULATOR
The fuel pressure regulator is attached to the end of the
fuel rail (600 cc STD) and in the fuel pump (600/700
cc “Laydown”/800/900 cc). The fuel pressure regula-
tor maintains the fuel pressure at a constant specified
level.
AO141D
! CAUTION
Do not replace an injector with one of a different
code symbol or color. Severe engine damage
may occur.