5
. Fuel Injection System
5-5
EFi System Component Description
Integrated ECU Module
Engine Control Unit (ECU)
• Powered by DC 8~16V, and has 32 terminals connector on the unit.
• The hardware component consists of an 16-bit computer that is its
control center. It contains the functional circuit interface of engine
condition sensing and the driving actuator for the air by-pass valve,
fuel injector, and fuel pump, as well as transistor ignition coil.
• Its major software is a monitor strategy operation program that
includes with controlling strategy, microarray profile and
self-diagnosis programs.
Air Bypass Valve (ABV)
• Its major component is the solenoid valve of high resistance driven
by electric current.
• By means of signals from all sensors, ECU outputs a signal to
control the opening angle of the valve so that can adjust air flowing
to the inlet manifold through the air by-pass valve, and then correct
the idle speed to have engine in normal operation.
T-MAP Sensor
• The major component of the T-MAP sensor is a variable transistor IC.
Its reference voltage is DC 5V, and output voltage range is DC 0~5V.
• It is a sensor of combination by both sensing pressure and
temperature, and can measure the absolute pressure and
temperature in intake process. It also conducts the fuel injection
quantity correction based on environmental temperature and position
level.
Throttle Position Sensor (TPS)
• Its major component is a highly variable resistor. The input voltage
range: 5V DC.
• Located on the side of throttle body. By means of the throttle valve
rotation to cause voltage change in linear, it provides ECU with
current throttle valve openness information. And also, the ECU
determines the most properly fuel injection and ignition timing.
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