Specifications

Fuel pressure, kgf/cm2

Ignition ON, engine not running 3.3 ÷ 3.8

Fuel system pressure at engine idle

Four-Cylinder Engines

Vacuum hose connected 2.7 ÷ 3.2

Vacuum hose disconnected 3.3 ÷ 3.8

V6 Engines

Vacuum hose connected 2.2 ÷ 2.8

Vacuum hose disconnected 2.9 ÷ 3.4

Residual system pressure (after 5 minutes) 2.1 ÷ 2.8

Maximum pressure developed by fuel pump 4.55

Injector electrical resistance, Ω 13.5 ÷ 19

Threaded fastener tightening torques N•m

Throttle body mounting nuts 22

Fuel rail mounting bolts (4-cylinder engines) 11.5

Fuel pressure regulator mounting bolts, 4-cylinder engines 12.2

V6 engines (screws into fuel rail) 30

Fuel pulsation damper 22

Location of fuel system components in engine compartment, 4-cylinder models

1 — Throttle Position Sensor (TPS)
2 — Throttle body
3 — Idle Air Control (IAC) valve
4 — Air intake chamber
5 — Fuel pressure regulator
6 — Fuel rail (on intake manifold)

Location of fuel system components in engine compartment (V6 models)

1 — Fuel rails (under cover)
2 — Fuel pressure regulator
3 — Throttle body
4 — TPS
5 — IAC (under throttle body)
6 — Air intake chamber

The fuel system consists of the fuel tank with the electric fuel pump installed inside it, the fuel pump relay, the fuel rail with injectors, the fuel pressure regulator, the air cleaner assembly and the throttle body. All models described in this Manual are equipped with an electronic fuel injection system.
Programmed Fuel Injection (PGM-FI) System
In the PGM-FI system, electrical pulses of precisely controlled duration are used to control fuel injection through the injectors directly into the intake port of each engine combustion chamber. The timing and duration of each injector opening is controlled by the Powertrain Control Module (PCM). The PCM continuously monitors various engine operating parameters and, based on the incoming information, determines the required amount of fuel to be injected into each intake port. In this system the throttle body serves only to control the air supply to the engine. Because each cylinder has its own injector, this design allows very precise control of the air-fuel mixture.