Fuel Injection System - ISUZU I-TEC: Description

I-TEC System is computerized emission, ignition, and fuel control system. I-TEC system controls engine operation and lowers exhaust emissions while maintaining good fuel economy and driveability. Electronic control unit (ECU) is "brain" of system.

ECU monitors information from various sensors and constantly adjusts spark timing and fuel delivery. Fuel system functions governed by ECU are fuel injection volume and air/fuel ratio.

ECU governs fuel injection operation by reading data from following sources: Oxygen sensor, crank angle sensor, vehicle speed sensor, water temperature sensor, air flow sensor, and throttle valve switch.

Fuel delivery system consists of fuel tank, fuel pump, pressure regulator, and fuel injectors. Injectors are aimed at intake valve of each cylinder.

NOTE: Primary sub-systems which affect fuel system operation will be covered. These include fuel supply system, fuel injectors, fuel pressure regulator, data sensors and fuel cut system. Refer to COMPUTERIZED ENGINE CONTROL article in the COMPUTER CONTROLS section.