Jeep Wrangler TJ. Manual — part 3
Symptoms of individual module failure could in-
clude any one or more of the above. The difference
would be that at least one or more modules would
respond to the DRBIII
t.
Diagnosis starts with symptom identification. If a
complete PCI Bus Communication Failure is sus-
pected, begin by identifying which modules the
vehicle is equipped with and then attempt to get a
response from the module with the DRBIII
t. If any
modules are responding, the failure is not related to
the total bus, but can be caused by one or more
modules, PCI circuit or power supply and ground
circuits. The DRBIII
t may display 9BUS +/- SIG-
NAL OPEN
9 or 9NO RESPONSE9 to indicate a
communication problem. These same messages will
be displayed if the vehicle is not equipped with that
particular module. The CCD error message is a
default message used by the DRBIII
t and in no way
indicates whether or not the PCI Bus is operational.
The message is only an indication that a module is
either not responding or the vehicle is not equipped.
NOTE: Communication
over
the
BUS
is
essential to the proper operation of the
vehicles on-board diagnostic systems and
the DRBIII
T
. Problems with the operation of
the BUS or DRBIII
T
must be corrected before
proceeding with diagnostic testing. If there is
a problem, refer to the communications
category of this manual.
NOTE: For 2005 model year, this vehicle will
integrate the Transmission Control Module
and Powertrain Control Module into a single
control module. This new module is the Next
Generation Controller for DaimlerChrysler
and will be referred to as the Powertrain
Control Module (PCM). The Transmission
Control Module is part of the Powertrain
Control Module.
Diagnostic procedures and DTC numbers are
some of the changes you will see which
reflect the new combined module technology.
The
PCM
will
have
four
color
coded
connectors
C1
through
C4,
(C1-BLK,
C2-ORANGE, C3-WHITE, C4-GREEN), each
PCM connector will have 38 pins each. Two
new tools are used for probing and repairing
the New PCM connectors. A New tool to
release the pins from the PCM connectors
Miller #3638 is introduced, you must use the
Miller tool #3638 to release the connector
pins or harness and connector damage will
occur.
Also
a
New
tool
for
probing
connectors Miller #8815 is introduced, you
must use the Miller tool #8815 to probe the
PCM pins or harness and connector damage
will occur. There is also a new Verification
test and module replacement procedure for
the PCM.
3.7
USING THE DRBIII
T
Refer to the DRBIII
t user’s guide for instructions
and assistance with reading trouble codes, erasing
trouble codes, and other DRBIII
t functions.
3.7.1
DRBIII
T ERROR MESSAGES AND
BLANK SCREEN
Under normal operation, the DRBIII
t will dis-
play one of only two error messages:
•
User-Requested WARM Boot
•
User-Requested COLD Boot
This is a sample of such an error message display:
ver: 2.14
date: 26 Jul93
file: key_itf.cc
date: Jul 26 1993
line: 548
err: 0x1
User-Requested COLD Boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
If the DRBIII
t should display any other error
message, record the entire display and call the
STAR Center for information and assistance.
3.7.2
DRBIII
T DOES NOT POWER UP
If the LED’s do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
connector cavity 16). A minimum of 11 volts is
required to adequately power the DRBIII
t.
If all connections are proper between the
DRBIII
t and the vehicle or other devices, and the
vehicle battery is fully charged, an inoperative
DRBIII
t may be the result of faulty cable or vehicle
wiring.
9
GENERAL INFORMATION
3.7.3
DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
4.0
DISCLAIMERS, SAFETY,
WARNING
4.1
DISCLAIMERS
All information, illustrations, and specifications
contained in this manual are based on the latest
information available at the time of publication.
The right is reserved to make changes at any time
without notice.
4.2
SAFETY
4.2.1
TECHNICIAN SAFETY INFORMATION
WARNING: WHEN OPERATING, ENGINES
PRODUCE AN ODORLESS GAS CALLED
CARBON MONOXIDE. INHALING CARBON
MONOXIDE GAS CAN RESULT IN SLOWER
REACTION
TIMES
AND
CAN
LEAD
TO
PERSONAL INJURY OR DEATH. WHEN THE
ENGINE IS OPERATING, KEEP SERVICE
AREAS WELL VENTILATED OR ATTACH THE
VEHICLE EXHAUST SYSTEM TO THE SHOP
EXHAUST REMOVAL SYSTEM.
Set the parking brake and block the wheels before
testing or repairing the vehicle. It is especially
important to block the wheels on front-wheel drive
vehicles: the parking brake does not hold the drive
wheels.
When servicing a vehicle, always wear eye pro-
tection, and remove any metal jewelry such as
watchbands or bracelets that might make an inad-
vertent electrical contact.
When diagnosing a body system problem, it is
important to follow approved procedures where
applicable. These procedures can be found in the
service manual. Following these procedures is very
important to the safety of individuals performing
diagnostic tests.
4.2.2
VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If it does not, false diagnostic error
messages may occur.
4.2.3
SERVICING SUB-ASSEMBLIES
Some components of the body system are in-
tended to be serviced in assembly only. Attempting
to remove or repair certain system sub-components
may result in personal injury and/or improper sys-
tem operation. Only those components with ap-
proved repair and installation procedures in the
service manual should be serviced.
4.2.4
DRBIII
T SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIII
T
MULTIMETER
IS
DANGEROUS.
READ ALL DRBIII
T
INSTRUCTIONS BEFORE
USING
THE
MULTIMETER.
FAILURE
TO
FOLLOW
THESE
INSTRUCTIONS
CAN
RESULT IN PERSONAL INJURY OR DEATH.
•
Follow the vehicle manufacturer’s service speci-
fications at all times.
•
Do not use the DRBIII
t if it has been damaged.
•
Do not use the test leads if the insulation is
damaged or if metal is exposed.
•
To avoid electrical shock, do not touch the test
leads, tips or the circuit being tested.
•
Choose the proper range and function for the
measurement. Do not try voltage or current mea-
surements that may exceed the rated capacity.
•
Do not exceed the limits shown in the table below:
FUNCTION
INPUT LIMIT
Volts
0-500 volts peak AC
0-500 volts DC
Ohms (resistance)*
0-1.12 megohms
Frequency measured
Frequency generated
1-10 khz
Temperature
-58-1100°F
-50-600C
10
GENERAL INFORMATION
FUNCTION
INPUT LIMIT
*Ohms cannot be measured if voltage is present.
Ohms can be measured only in a non-powered
circuit.
•
Voltage between any terminal and ground must
not exceed 500v DC or 500v peak AC.
•
Use caution when measured voltage above 25v
DC or 25v AC.
•
The circuit being tested must be protected by a
10A fuse or circuit breaker.
•
Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.
•
When testing for the presence of voltage or cur-
rent, make sure the meter is functioning cor-
rectly. Take a reading of a known voltage or
current before accepting a zero reading.
•
When measuring current, connect the meter in
series with the load.
•
Disconnect the live test lead before disconnecting
the common test lead.
•
When using the meter function, keep the
DRBIII
t away from spark plug or coil wires to
avoid measuring error from outside interference.
4.3
WARNINGS
4.3.1
VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition is
9off9. Failure to do so could
damage the module.
When testing voltage or continuity at any control
module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation: this will damage it and eventually cause
it to fail because of corrosion.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
When replacing a blown fuse, it is important to use
only a fuse having the correct amperage rating. The
use of a fuse with a rating other than indicated may
result in a dangerous electrical system overload. If a
properly rated fuse continues to blow, it indicates a
problem in the circuit that must be corrected.
Service and general information labels about the
airbag system can be found on the driver’s sun visor,
the glove box door, and in the engine compartment.
To ensure that the airbag will be ready to deploy
in a collision, have the system serviced by an
authorized dealer.
4.3.2
ROAD TESTING A COMPLAINT
VEHICLE
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
WARNING: REASSEMBLE ALL COMPONENTS
BEFORE ROAD TESTING A VEHICLE. DO NOT
TRY TO READ THE DRBIII
T
SCREEN OR OTHER
TEST EQUIPMENT DURING A TEST DRIVE. DO
NOT HANG THE DRBIII
T
OR OTHER TEST
EQUIPMENT FROM THE REARVIEW MIRROR
DURING A TEST DRIVE. HAVE AN ASSISTANT
AVAILABLE TO OPERATE THE DRBIII
T
OR
OTHER
TEST
EQUIPMENT.
FAILURE
TO
FOLLOW THESE INSTRUCTIONS CAN RESULT
IN PERSONAL INJURY OR DEATH.
5.0
REQUIRED TOOLS AND
EQUIPMENT
•
8310 Airbag System Load Tool
•
8443 Supplemental Restraints System Load Tool
•
DRBIII
t (diagnostic read-out box)
•
jumper wires
•
ohmmeter
•
test light
•
voltmeter
6.0
GLOSSARY OF TERMS
4WD
4-Wheel Drive
ABS
Antilock Braking System
ACM
Airbag Control Module
AECM
Airbag Electronic Control Module
AIRBAG
Also called
9squib9 initiator. Located
inside the driver side airbag assem-
bly.
ASDM
Airbag System Diagnostic System
CAB
Controller Antilock Brake
CTMM
Compass Temperature Mirror Mod-
ule
DAB
Driver AirBag
DLC
Data Link Connector
DTC
Diagnostic Trouble Code
11
GENERAL INFORMATION
EMIC
Electro/Mechanical Instrument
Cluster
LED
Light Emitting Diode
LFW
Low Fuel Warning
MIC
Mechanical Instrument Cluster
MIL
Malfunction Indicator Lamp
NGC
Next Generation Controller
PAB
Passenger AirBag
PCI
Programmable Communication In-
terface
PCM
Powertrain Control Module
PDC
Power Distribution Center
S.T.A.R.
Service Technical Assistance Re-
source
SKIM
Sentry Key Immobilizer Module
SKIS
Sentry Key Immobilizer System
SRS
Supplemental Restraints System
TCM
Transmission Control Module
VFD
Vacuum Fluorescent Display
12
GENERAL INFORMATION
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