Fuel Delivery and Air Induction: Description and Operation

PURPOSE
The Fuel Delivery and Air Induction Systems provide a method for the Engine Control Module (ECM) to monitor and precisely control engine operation.

OPERATION
There are two types of fuel injection used in this fuel delivery system. They are Simultaneous Multiport Fuel Injection and Sequential Multiport Fuel Injection. In Simultaneous Multiport, fuel is injected into all four cylinders at the same time, twice each engine cycle.
In the Sequential Multiport Fuel Injection System, fuel is injected into each cylinder during each engine cycle according to the firing order.

When the engine is being started and/or if the Fail-Safe System is operating, Simultaneous Multiport Fuel Injection System is used.

When the engine is running, Sequential Multiport Fuel Injection System is used.

The fuel system is designed to allow delivery of a precise amount of air/fuel mixture in response to the throttle valve opening and engine operating conditions. The Fuel and Air Induction Systems consist of the following components:

^ Accelerator pedal and linkage
^ Air cleaner
^ Fuel filter
^ Fuel injectors
^ Fuel lines
^ Fuel pressure regulator
^ Fuel pump
^ Fuel pump relay
^ Fuel tank
^ Idle control system
^ Throttle chamber and intake plenum

NOTE: The operation of the control circuits are discussed in COMPUTERS AND CONTROL SYSTEMS. Description and Operation