Installation - 2.7L; Installation - 3.5L; Fuel Pump Relay Description; Operation - Chrysler 300M Service Manual

LH
FUEL INJECTOR (Continued)
(3) Remove intake manifold plenum. Refer to the
Engine section for information.
(4) Remove intake manifold plenum mounting
bolts. Lift Plenum up off of engine. Cover intake
manifold to prevent foreign material from entering
engine.
(5) Disconnect fuel supply tube quick connect fit-
ting at the rear of the fuel rail. Refer to Quick Con-
nect Fittings in the Fuel Delivery Section.
(6) If the injector connectors are not tagged with
their cylinder number, tag them to identify the cor-
rect cylinder.
(7) Remove electrical connectors from the fuel
injectors.
(8) Remove mounting bolts on both sides of fuel
rail.
(9) Lift fuel rail straight up off of cylinder head.
(10) Remove retaining clips from fuel injectors at
fuel rail.
(11) Remove fuel injectors.
INSTALLATION

INSTALLATION - 2.7L

(1) Lightly lubricate the fuel injector O-rings with
a couple drops of clean engine oil.
(2) Install fuel injectors.
(3) Install retaining clips on fuel injectors.
(4) Push injectors into fuel injector rail until clips
are in the correct position.
(5) Position fuel rail over cylinder head, and push
rail into place. Tighten fuel rail mounting bolts to 11
N·m (100 in. lbs.) torque.
(6) Connect fuel supply tube quick connect fittings
at the rear of intake manifold. Refer to Quick Con-
nect Fittings in the Fuel Delivery Section.
(7) Connect electrical connectors to fuel injectors.
(8) Install intake manifold plenum. Refer to the
Engine section for information.
(9) Connect negative cable to battery.

INSTALLATION - 3.5L

(1) Lightly lubricate the fuel injector O-rings with
a couple drops of clean engine oil.
(2) Install retaining clips on fuel injectors.
(3) Push injectors into fuel injector rail until clips
are in the correct position.
(4) Position fuel rail over cylinder head, and push
rail into place. Tighten fuel rail mounting bolts to 28
N·m (250 in. lbs.) torque.
(5) Connect fuel supply tube quick connect fittings
at the rear of the fuel rail. Refer to Quick Connect
Fittings in the Fuel Delivery Section.
(6) Connect electrical connectors to fuel injectors.
(7) Install intake manifold plenum. Refer to the
Engine section for information.
(8) Connect the battery cable.
FUEL PUMP RELAY
DESCRIPTION
The fuel pump relay is located in the PDC. The
inside top of the PDC cover has a label showing relay
and fuse location.

OPERATION

The fuel pump relay supplies battery voltage to the
fuel pump. A buss bar in the Power Distribution Cen-
ter (PDC) supplies voltage to the solenoid side and
contact side of the relay. The fuel pump relay power
circuit contains a fuse between the buss bar in the
PDC and the relay. The fuse is located in the PDC.
Refer to the Wiring Diagrams for circuit information.
The PCM controls the fuel pump relay by switch-
ing the ground path for the solenoid side of the relay
on and off. The PCM turns the ground path off when
the ignition switch is in the Off position. When the
ignition switch is in the On position, the PCM ener-
gizes the fuel pump. If the crankshaft position sensor
does not detect engine rotation, the PCM de-ener-
gizes the relay after approximately one second.
IDLE AIR CONTROL MOTOR
DESCRIPTION
The idle air control motor (IAC) attaches to the
throttle body (Fig. 10). It is a liner solenoid valve.
Fig. 10 TPS & IDLE AIR CONTROL VALVE
1 - TPS
2 - IAC
FUEL INJECTION 14 - 25