Introduction; System Coverage; Six-Step Troubleshooting Procedure; Identification Of System - Chrysler Pacifica 2004 Manual

1.0 INTRODUCTION

The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose the 2004 Chrysler Pacifica Mark
25 Antilock Braking System (ABS), and Mark 25
Antilock Braking System with Traction Control.
The diagnostics in this manual are based on the
failure condition or symptom being present at time
of diagnosis.
Please follow the recommendations below when
choosing your diagnostic path.
1. First make sure the DRBIII is communicating
with the CAB. If the DRBIII
Response" condition, you must diagnose that
first.
2. Read DTC's (diagnostic trouble codes) with the
DRBIII .
3. If no DTC's are present, identify the customer
complaint.
4. Once the DTC or customer complaint is identi-
fied, locate the matching test in the Table of
Contents and begin to diagnose the symptom.
All component location views are in Section 8.0.
All connector pinouts are in Section 9.0. All sche-
matics are in Section 10.0.
An asterisk (*) placed before the symptom de-
scription indicates a concern with no associated
DTC.
When repairs are required, refer to the appropri-
ate service manual for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added; carry over sys-
tems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
CODE. It is recommended that you review the
entire manual to become familiar with all new and
changed diagnostic procedures.
After using this book, if you have any comments
or recommendations, please fill out the form at the
back of the book and mail it back to us.

1.1 SYSTEM COVERAGE

This diagnostic procedure manual covers the an-
tilock braking system (ABS), and the traction con-
trol system (TCS) found on: Chrysler Pacifica.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the controller antilock brake module
is done in six basic steps:
• verification of complaint
• verification of any related symptoms
•
symptom analysis
• problem isolation
• repair of isolated problem
•
verification of proper operation
2.0 IDENTIFICATION OF
Vehicles equipped with the Teves Mark 25 an-
tilock brake system can be identified by the pres-
ence of the controller antilock brake module located
beneath the master cylinder.
displays a "No
The presence of the Traction Control system is
indicated by the switch on top of the center console
by shifter.
3.0 SYSTEM DESCRIPTION AND
3.1 TEVES MARK 25 SYSTEM
The controller antilock brake module is used to
monitor wheel speeds and to modulate (control)
hydraulic pressure in each brake channel. The
modulated hydraulic pressure is used to prevent
wheel lock-up during braking.
The Teves Mark 25 system uses a diagonal split
hydraulic brake system. In the standard brake
mode the master cylinder primary circuit supplies
pressure to the right front and left rear wheel
brakes, and the secondary master cylinder circuit
supplies pressure to the left front and right rear
wheel brakes.
All vehicles equipped with ABS use Electronic
Variable Brake Proportioning (EVPB) to balance
front-to-rear braking when brakes are applied in
the partial braking range.
3.2 TRACTION CONTROL SYSTEM (TCS)
The main purpose of traction control is to reduce
wheel slip and maintain traction at the driven
wheels when road surfaces are slippery. The trac-
tion control system reduces wheel slip by braking
the wheel that is losing traction. The system is
designed to operate at speeds below 56 km/h (35
mph).

3.3 SYSTEM COMPONENTS

ABS
• controller antilock brake (CAB)
1
GENERAL INFORMATION
SYSTEM
FUNCTIONAL OPERATION
DESCRIPTION
DESCRIPTION (IF EQUIPPED)