Service manual

90-898303

1-4

Fuel Injection System Function

Fuel is delivered directly to the engine by way of fuel injectors. These injectors

are provided with a constant supply of fuel delivered to the fuel rail. The

injectors are opened and closed electronically by the Electronic Control

Module (ECM). The ECM receives input signals from various sensors in the

EFI system which in turn transmits controlling outputs (open/close) to the

injectors. The length of time the injectors stay open is considered pulse width.

The pulse width will widen (richer) or narrow (leaner) depending on signals the

ECM receives from sensors, to allow efficient operation at all speeds and

conditions.

Notes

_______________________