PGM-FI System Description - Injection Control
Fuel injection controls include fuel injection amount control, fuel cut control and fuel pump control. Adopting PGM-FI (programmed-fuel injection) technology enables accurate fuel controls, which contributes to increasing engine power and decreasing fuel consumption.

Fuel Injection Amount
The fuel injection amount is determined by adding correction values to a basic injection amount.
The powertrain control module (PCM) controls the amount of fuel injection by the length of time the injector is energized.

Fuel Injection Timing
The fuel injection timing is determined by the PCM, which calculates the injection time for each cylinder based on the signals sent from the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor and controls the time to energize the injector.
In addition, the full sequentially injection system is adopted as a fuel injection system.
CKP Sensor
The CKP sensor is attached to oil pan. Each of the 58 teeth on the crankshaft pulse plate passes over it, a pulse signal is delivered to PCM.
CMP Sensor B
Camshaft position (CMP) sensor B is attached to the cylinder head. Every time one of the three protrusions of the pulse plate attached to the camshaft passes over it, a pulse signal is delivered.


Fuel Injector
The fuel injectors are installed on the cylinder head, they use multiple nozzles to inject high pressure fuel into the combustion chamber.
When the coil in the injector is energized, the plunger is pulled in. The needle valve, which is integral with the plunger, is pulled on full. Then, the injector sprays the fuel.

Providing six injection ports promotes a finer fuel spray and improved fuel consumption by reducing fuel adherence to the top surface of the piston, reduction of hydrocarbons (HC) discharge, and higher engine performance.

MAF Sensor/IAT Sensor
A mass air flow or MAF sensor and an intake air temperature or IAT sensor are installed at the outlet of air cleaner to detect the amount of intake air and the intake air temperature. Within the mass air flow is a hot wire, cold film and IC. As air passes the heated hot wire, the resistance changes as it is cooled by the airflow. This is used to detect the amount of intake air.
The control circuit installed in the IC detects the resistance of the hot wire and the cold film so that temperature difference between the hot wire and the cold film is held constant. The intake air quantity is calculated based on the current value and voltage that is input to the PCM.
The Intake air temperature or IAT sensor uses a thermistor that changes resistance changes depending on the intake air temperature. This causes a changing voltage that is input to the PCM.