Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Instruction - page 26

(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.

THROTTLE CABLE

REMOVAL

(1) Working from the engine compartment, hold

throttle lever in the wide open position and remove
the throttle cable from the throttle body cam (Fig. 3,
4, 5, 6 and 7).

(2) From inside the vehicle, hold the throttle pedal

up and remove the cable retainer and cable from up-
per end of pedal shaft (Fig. 1 and Fig. 2).

(3) Remove retainer clip from throttle cable and

grommet at the dash panel (Fig. 2).

(4) From the engine compartment, pull the throttle

cable out of the dash panel grommet. The grommet
should remain in the dash panel.

(5) Remove the throttle cable from the throttle

bracket by carefully compressing both retaining tabs
simultaneously. Gently pull throttle cable from throt-
tle bracket.

INSTALLATION

(1) From the engine compartment, push the hous-

ing end fitting into the dash panel grommet.

(2) Install cable housing (throttle body end) into

the cable mounting bracket on the engine.

(3) From inside the vehicle, hold up pedal and feed

throttle cable core wire through hole in upper end of
the pedal shaft. Install cable retainer (Fig. 2).

(4) Install cable retainer clip (Fig. 2).
(5) From the engine compartment, rotate the throt-

tle lever to the wide open position and install throt-
tle cable.

Fig. 3 Throttle Cable Attachment to Throttle

Body—2.2L/2.5L TBI Engine

Fig. 4 Throttle Cable Attachment to Throttle

Body—2.5L MPI Flexible Fuel Engine

Fig. 5 Throttle Cable Attachment to Throttle

Body—Turbo III Engine

Fig. 6 Throttle Cable Attachment to Throttle

Body—3.0L Engine

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FUEL SYSTEMS

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Fig. 7 Throttle Cable Attachment to Throttle

Body—3.3L and 3.8L Engines

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FUEL SYSTEMS

14 - 23

2.2L/2.5L SINGLE POINT FUEL INJECTION—SYSTEM OPERATION

INDEX

page

page

Air Conditioning (A/C) Clutch Relay—PCM Output

. 28

Air Conditioning Switch Sense—PCM Input

. . . . . 26

Auto Shutdown (ASD) Relay and Fuel Pump

Relay—PCM Output

. . . . . . . . . . . . . . . . . . . . . 29

Battery Voltage—PCM Input

. . . . . . . . . . . . . . . . 26

Brake Switch—PCM Input

. . . . . . . . . . . . . . . . . . 26

EVAP Canister Purge Solenoid—PCM Output

. . . 29

CCD Bus

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Coolant Temperature Sensor—PCM Input

. . . . . . 26

Data Link Connector—PCM Output

. . . . . . . . . . . 30

Distributor (Hall Effect) Pick-Up—PCM Input

. . . . 26

Electric Electronic Gas Recirculation—PCM Output

. 30

Fuel Injector—PCM Output

. . . . . . . . . . . . . . . . . 31

Fuel Pressure Regulator

. . . . . . . . . . . . . . . . . . . 33

General Information

. . . . . . . . . . . . . . . . . . . . . . . 24

Generator Field—PCM Output

. . . . . . . . . . . . . . . 31

Heated Oxygen Sensor (O

2

Sensor)—PCM Input

. 27

Idle Air Control Motor—PCM Output

. . . . . . . . . . 29

Ignition Coil—PCM Output

. . . . . . . . . . . . . . . . . . 31

Malfunction Indicator Lamp (Check Engine)—PCM

Output

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Manifold Absolute Pressure (MAP) Sensor—PCM

Input

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Modes of Operation

. . . . . . . . . . . . . . . . . . . . . . . 32

Part Throttle Unlock Solenoid—PCM Output

. . . . 31

Powertrain Control Module

. . . . . . . . . . . . . . . . . 25

Radiator Fan Relay—PCM Output

. . . . . . . . . . . . 31

Speed Control Solenoids—PCM Output

. . . . . . . . 31

Speed Control—PCM Input

. . . . . . . . . . . . . . . . . 27

System Diagnosis

. . . . . . . . . . . . . . . . . . . . . . . . 25

Tachometer—PCM Output

. . . . . . . . . . . . . . . . . . 32

Throttle Body

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Throttle Position Sensor (TPS)—PCM Input

. . . . . 28

Transaxle Park/Neutral Switch—PCM Input

. . . . . 28

Vehicle Speed Sensor—PCM Input

. . . . . . . . . . . 28

GENERAL INFORMATION

The computer regulated, Electronic Fuel Injection

System (Fig. 1) provides a precise air/fuel ratio for
all driving conditions. The fuel injection system is
controlled by the powertrain control module (PCM).

The PCM is a pre-programmed digital computer. The

PCM regulates ignition timing, air-fuel ratio, emission
control devices, cooling fan, charging system, speed con-
trol, and idle speed. The PCM can adapt its requirement
to meet changing operating conditions.

Fig. 1 Electronic Fuel Injection Components

14 - 24

FUEL SYSTEMS

Ä

Various sensors provide the inputs necessary for

the PCM to correctly regulate fuel flow at the fuel
injector. These include the manifold absolute pres-
sure, throttle position, oxygen sensor, coolant tem-
perature, and vehicle speed sensors. In addition to
the sensors, various switches and relays provide im-
portant information and system control. The inputs
include the park/neutral switch and air conditioning
clutch switch. The outputs include the auto shutdown
relay and fuel pump relay.

All inputs to the PCM are converted into signals.

Based on these inputs the PCM adjusts air-fuel ratio,
ignition timing and other controlled outputs. The
PCM adjusts the air-fuel ratio by changing the injec-
tor pulse width. Injector pulse width is the period of
time the injector is energized.

SYSTEM DIAGNOSIS

The PCM tests many of its own input and output

circuits. If a fault is found in a major system, the in-
formation is stored in memory. Technicians can dis-
play fault information through the instrument panel
Malfunction Indicator lamp (instrument panel Check
Engine lamp) or by connecting the DRBII scan tool.
For diagnostic trouble code information, refer to On
Board Diagnostics in 2.2L/2.5L Single Point Fuel In-
jection—General Diagnosis section of this group.

CCD BUS

Various modules exchange information through a

communications port called the CCD Bus. The pow-
ertrain control module (PCM) transmits vehicle load
data on the CCD Bus.

POWERTRAIN CONTROL MODULE

The powertrain control module (PCM) is a digital

computer containing a microprocessor (Fig. 2). The
PCM receives input signals from various switches
and sensors that are referred to as PCM Inputs.
Based on these inputs, the PCM adjusts various en-
gine and vehicle operations through devices that are
referred to as PCM Outputs.

PCM Inputs:

• Air Conditioning Controls

• Battery Voltage

• Brake Switch

• Coolant Temperature Sensor

• Distributor (Hall Effect) Pick-up

• Manifold Absolute Pressure (MAP) Sensor

• Oxygen Sensor

• SCI Receive

• Speed Control System Controls

• Throttle Position Sensor

• Park/Neutral Switch (automatic transaxle)

• Vehicle Speed Sensor

PCM Outputs:

• Air Conditioning Clutch Relay

• Generator Field

• Idle Air Control Motor

• Auto Shutdown (ASD) Relay

• Canister Purge Solenoid

• Malfunction Indicator (Check Engine) Lamp

• Data Link Connector (Diagnostic Connector)

• Electronic EGR Transducer

• Fuel Injector

• Ignition Coil

• Part Throttle Unlock Solenoid (Automatic Tran-
saxle)
• Radiator Fan Relay

• Speed Control Solenoids

• Tachometer Output

Based on inputs it receives, the PCM adjusts fuel

injector pulse width, idle speed, ignition spark ad-
vance, ignition coil dwell and canister purge opera-
tion. The PCM regulates operation of the EGR,
cooling fan, A/C and speed control systems. The PCM
changes generator charge rate by adjusting the gen-
erator field.

The PCM adjusts injector pulse width (air-fuel ra-

tio) based on the following inputs.
• battery voltage

• coolant temperature

• exhaust gas content

• engine speed (distributor pick-up)

• manifold absolute pressure

• throttle position

The PCM adjusts ignition timing based on the fol-

lowing inputs.
• coolant temperature

• engine speed (distributor pick-up)

• manifold absolute pressure

• throttle position

The Auto Shutdown (ASD) and Fuel Pump relays

are mounted externally, but turned on and off by the
PCM through the same circuit.

The distributor pick-up signal is sent to the PCM.

If the PCM does not receive a distributor signal
within approximately one second of engine cranking,

Fig. 2 PCM

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FUEL SYSTEMS

14 - 25

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