3-213-21
QUANTUM Electronic Fuel System - DescriptionQUANTUM Electronic Fuel System - Description
1. Electronic Control Module (ECM) -1. Electronic Control Module (ECM) -
Receives electronic inputs from the driverReceives electronic inputs from the driver
as well as from sensors that provide information electronically, such as well as from sensors that provide information electronically, such as oil pressureas oil pressure
and temperature and intake manifold pressure. This and temperature and intake manifold pressure. This information is used to controlinformation is used to control
both the quantity of fuel injected and injection timing.both the quantity of fuel injected and injection timing.
2. Programmable Read Only Memory (PROM) -2. Programmable Read Only Memory (PROM) -
Located in the ECM andLocated in the ECM and
encoded with the operating software. Additional information is encoded with the operating software. Additional information is programmed into theprogrammed into the
EEPROM. This information controls the horsepower rating, torque curve, maximumEEPROM. This information controls the horsepower rating, torque curve, maximum
engine speed and engine protection devices. The ECM processes this iengine speed and engine protection devices. The ECM processes this informationnformation
and sends electronic signals to the Electronic Fuel System Injectors where theand sends electronic signals to the Electronic Fuel System Injectors where the
precise amount of fuel is injected into the engine.precise amount of fuel is injected into the engine.
3. Electronic Fuel System Injectors -3. Electronic Fuel System Injectors -The injector is a lightweight, compact unitThe injector is a lightweight, compact unit
that injects diesel fuel directly into the that injects diesel fuel directly into the combustion chamber. The amount of fuelcombustion chamber. The amount of fuel
injected and the beginning of injection timing is determined by the ECM. The ECMinjected and the beginning of injection timing is determined by the ECM. The ECM
sends a command pulse which activates the injector solenoid.sends a command pulse which activates the injector solenoid.
The injector performs four functions:The injector performs four functions:
a - Creates the high fuel a - Creates the high fuel pressure required for efficient injection.pressure required for efficient injection.
b - Meters and injects the exact amount of fuel required to b - Meters and injects the exact amount of fuel required to handle the load.handle the load.
c - Atomizes the fuel for mixing with the air in the combustion chamber.c - Atomizes the fuel for mixing with the air in the combustion chamber.
d - Permits continuous fuel flow for d - Permits continuous fuel flow for component cooling.component cooling.
Electronic fuel system injectors are self compensating and virtually eliminate engineElectronic fuel system injectors are self compensating and virtually eliminate engine
tune-ups.tune-ups.
Note:Note:Never apply 12 or 24 volts directly to terminals on Never apply 12 or 24 volts directly to terminals on the injector or enginethe injector or engine
sensors as they will burn out. Before removing injectors, the fuel passages sensors as they will burn out. Before removing injectors, the fuel passages must bemust be
blown out to prevent fuel flow from entering the cylinder blown out to prevent fuel flow from entering the cylinder head.head.
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