Chrysler 300M, Dodge Interpid. Manual — part 273

SPECIAL TOOLS

FUEL

ACCELERATOR PEDAL

REMOVAL

(1) Working from the engine compartment, hold

the throttle body throttle lever in the wide open posi-
tion. Remove the throttle cable from the throttle body
cam.

(2) From inside the vehicle, hold up the pedal and

remove the cable retainer and throttle cable from the
upper end of the pedal shaft (Fig. 1) and (Fig. 2).

Pressure Gauge Assembly C–4799–B

Fuel Pressure Test Adapter 6539

Spanner Wrench 6856

Fuel Line Adapter 1/4

O2S (Oxygen Sensor) Remover/Installer—C-4907

O2S (Oxygen Sensor) Remover/Installer - 8439

Fig. 1 ACCELERATOR PEDAL AND THROTTLE

CABLE

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FUEL INJECTION

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FUEL INJECTION (Continued)

(3) Working from the passenger compartment,

remove nuts from accelerator pedal base (Fig. 3).
Remove pedal and base from vehicle.

INSTALLATION

(1) Position accelerator pedal assembly over studs

onto dash panel. Ensure carpet and insulation are
trapped between the lip of the pedal base and the
floor plan (Fig. 4). Install mounting nuts and tighten
to 12 N·m (105 in. lbs.) torque.

(2) From inside the vehicle, hold up the pedal and

install the throttle cable and cable retainer in the
upper end of the pedal shaft.

(3) From the engine compartment, hold the throt-

tle body lever in the wide open position and install
the throttle cable.

CRANKSHAFT POSITION
SENSOR

DESCRIPTION

The crankshaft sensor is located on the passengers

side of the transmission housing, above the differen-
tial housing (Fig. 5). The bottom of the sensor is posi-
tioned next to the drive plate.

The sensor is a hall effect device combined with an

internal magnet. It is also sensitive to steel within a
certain distance from it.

Fig. 2 RETAINER CLIP

Fig. 3 ACCELERATOR PEDAL

1 - MOUNTING NUTS
2 - ACCELERATOR PEDAL

Fig. 4 CARPET AND INSULATION PLACEMENT

1 - PEDAL BASE
2 - CARPET
3 - INSULATION
4 - FLOOR PAN

Fig. 5 CRANKSHAFT POSITION SENSOR

1 - CRANKSHAFT POSITION SENSOR

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FUEL INJECTION

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ACCELERATOR PEDAL (Continued)

OPERATION

Engine speed and crankshaft position are provided

through the crankshaft position sensor. The sensor
generates pulses that are the input sent to the pow-
ertrain control module (PCM). The PCM interprets
the sensor input to determine the crankshaft posi-
tion. The PCM then uses this position, along with
other inputs, to determine injector sequence and igni-
tion timing.

The crankshaft position sensor detects slots cut

into the transmission driveplate extension. There are
3 sets of slots. Two sets contain 4 slots and one set
contains 5 slots, for a total of 13 slots (Fig. 6). Basic
timing is set by the position of the last slot in each
group. Once the Powertrain Control Module (PCM)
senses the last slot, it determines which piston will
be next at TDC from the camshaft position sensor
input. It may take the PCM one engine revolution to
determine crankshaft position.

The PCM uses crankshaft position reference to

determine injector sequence and ignition timing.
Once the PCM determines crankshaft position, it
begins energizing the injectors and coils in sequence.

The PCM uses the Crankshaft Position sensor to

calculate the following:

• Engine rpm

• TDC number 1 and 4

• Ignition coil synchronization

• Injector synchronization

• Camshaft-to-crankshaft misalignment (Timing

belt skipped 1 tooth or more diagnostic trouble code)

REMOVAL

The crankshaft sensor is located on the passengers

side of the transmission housing, above the differen-

tial housing. The bottom of the sensor sits above the
drive plate.

(1) Disconnect electrical connector from crankshaft

position sensor.

(2) Remove sensor mounting screw. Remove sensor.

INSTALLATION

The crankshaft sensor is located on the passengers

side of the transmission housing, above the differen-
tial housing. The bottom of the sensor sits above the
drive plate.

(1) Install sensor and push sensor down until con-

tact is made with the transmission case. While hold-
ing the sensor in this position, install and tighten the
retaining bolt to 12 N·m (105 in. lbs.) torque.

(2) Connect electrical connector to crankshaft posi-

tion sensor.

ENGINE SPEED SENSOR

DESCRIPTION

The PCM receives a signal from the TCM and the

transaxle output speed sensor over the bus communi-
cation line to indicate vehicle speed on automatic
transmission cars. On Manual transmission cars (if
equipped) vehicle, a dedicated vehicle speed sensor is
connected to the PCM.

OPERATION

The Transmission Control Module (TCM) supplies

the road speed and distance traveled inputs to the
PCM. From these inputs and the throttle position
sensor input, the PCM determines when a decelera-
tion condition occurs.

FUEL INJECTOR

DESCRIPTION

The injectors are positioned in the cylinder heads

with the nozzle ends directly above the intake valve
port (Fig. 8). The fuel injectors are electrical sole-
noids (Fig. 7).

OPERATION

The fuel injectors are 12 volt electrical solenoids

(Fig. 9). The injector contains a pintle that closes off
an orifice at the nozzle end. When electric current is
supplied to the injector, the armature and needle
move a short distance against a spring, allowing fuel
to flow out the orifice. Because the fuel is under high
pressure, a fine spray is developed in the shape of a
hollow cone or two streams. The spraying action
atomizes the fuel, adding it to the air entering the

Fig. 6 TIMING SLOTS

1 - TORQUE CONVERTER DRIVE PLATE
2 - SLOTS

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FUEL INJECTION

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CRANKSHAFT POSITION SENSOR (Continued)

combustion chamber. Fuel injectors are not inter-
changeable between engines.

The PCM provides battery voltage to each injector

through the ASD relay. Injector operation is con-
trolled by a ground path provided for each injector by
the PCM. Injector on-time (pulse-width) is variable,
and is determined by the PCM processing all the
data previously discussed to obtain the optimum
injector pulse width for each operating condition. The
pulse width is controlled by the duration of the
ground path provided.

REMOVAL

REMOVAL - 2.7L

(1) Release fuel system pressure. Refer to Fuel

System Pressure Release Procedure in this section.

(2) Disconnect negative cable to battery.
(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-

tings at the rear of intake manifold. Refer to Quick
Connect 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 fuel rail mounting bolts.
(9) Lift fuel rail straight up off of the cylinder

head.

(10) Remove retaining clips from fuel injectors at

fuel rail.

(11) Remove fuel injectors.
(12) Repeat for remaining injectors.
(13) Check injector O-ring for damage. If O-ring is

damaged, it must be replaced. Replace the injector
clip if it is damaged.

REMOVAL - 3.5L

(1) Release fuel system pressure. Refer to Fuel

System Pressure Release Procedure in this section.

(2) Disconnect the negative battery cable.

Fig. 7 Fuel Injector - Typical

Fig. 8 Fuel Injector Location—Typical

1 - FUEL INJECTORS
2 - IGNITION COILS

Fig. 9 FUEL INJECTOR - TYPICAL

1 - FUEL INJECTOR
2 - NOZZLE
3 - TOP (FUEL ENTRY)

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FUEL INJECTOR (Continued)