Jeep XJ. Manual — part 884
vehicle battery is fully charged, an inoperative
DRBIII
t may be the result of a faulty cable or
vehicle wiring. For a blank screen, refer to the XJ
Body Diagnostic symptoms.
3.9.3
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,
WARNINGS
4.1
DISCLAIMERS
All information, illustrations and specifications
contained in this manual are based on the latest
information 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: ENGINES PRODUCE CARBON
MONOXIDE THAT IS ODORLESS, CAUSES
SLOWER REACTION TIMES AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE IS
OPERATING, KEEP SERVICE AREAS WELL
VENTILATED OR ATTACH THE VEHICLE
EXHAUST SYSTEM TO THE SHOP EXHAUST
REMOVAL SYSTEM.
Some operations in this manual require that
hydraulic tubes, hoses, and fittings, to be discon-
nected for inspection or testing purposes. These
systems, when fully charged, contains fluid at high
pressure. Before disconnecting any hydraulic tubes,
hoses or fittings, be sure that the system is fully
de-pressurized.
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 transmission system problem,
it is important to follow approved procedures where
applicable. Following these procedures is very im-
portant 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 codes
or error messages may occur. It is extremely impor-
tant that accurate shift lever position data be avail-
able to the TCM. The accuracy of any diagnostic
trouble code found in memory is doubtful unless the
Shift Lever Test, performed on the DRBIII
t Scan
Tool, passes without fail.
4.2.3
SERVICING SUB-ASSEMBLIES
Some components of the powertrain system are
intended to be serviced in assembly only. Attempt-
ing to remove or repair certain system sub-
components may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
4.2.4
DRBIII
T SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRB
T
MULTIMETER IS DANGEROUS. IT CAN
EXPOSE YOU TO SERIOUS OR POSSIBLY
FATAL
INJURY.
CAREFULLY
READ AND
UNDERSTAND THE CAUTIONS AND THE
SPECIFICATION LIMITS.
•
Follow the vehicle manufacture’s service specifi-
cations at all times.
•
Do not use the DRB
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.
5
GENERAL INFORMATION
FUNCTION
INPUT LIMIT
Volts
0 - 500 peak volts AC
0 - 500 volts DC
Ohms (resistance)*
0 -1.12 megohms
Frequency Measured
Frequency Generated
0 - 10 kHz
Temperature
-58 - 1100°F
-50 - 600°C
* 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 measuring 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 “off”. 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.
4.3.2
ROAD TEST 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.
CAUTION:
BEFORE
ROAD
TESTING
A
VEHICLE,
BE
SURE
THAT
ALL
COMPONENTS
ARE
REASSEMBLED.
DURING THE TEST DRIVE, DO NOT TRY TO
READ THE DRBIII
T
SCREEN WHILE IN
MOTION. DO NOT HANG THE DRBIII
T
FROM
THE
REAR
VIEW
MIRROR
OR
OPERATE
IT
YOURSELF.
HAVE
AN
ASSISTANT AVAILABLE TO OPERATE THE
DRBIII
T
.
Road testing is an essential step in the diagnostic
process that must not be overlooked. Along with
diagnostic information obtained from the DRBIII
t
Scan Tool and the original customer concern, the
road test helps to verify the problem and observe
operation under actual vehicle driving conditions.
Just as important as the road test is, there are
preliminary inspections that should be carried out
prior to the road test. Always check the fluid level
and condition before going on a road test or per-
forming other tests. Also try to determine the type
of fluid being used. Improper fluid can result in
problems. Additionally, a variety of complaints can
be caused by incorrect fluid level. Some of the
conditions caused by incorrect fluid level are as
follows:
•
Delayed engagement
•
Poor shifting or erratic shifts
•
Excessive noise
•
Overheating
The next step is to verify that the shift linkage is
correctly adjusted. If the gearshift linkage is incor-
rectly adjusted because of wear or incorrect adjust-
ment, a number of complaints can result.
The TCM monitors the Transmission Range
(TRS) Sensor at all times. If the linkage is incor-
rectly adjusted, the TCM may sense a shift lever
position that is not correct for the gear range chosen
by the driver. This may cause diagnostic trouble
codes to be set and a possible limp-in situation.
The following complaints may also be the result
of an incorrectly adjusted or worn linkage:
•
Delayed clutch engagement or erratic shifts
•
Vehicle able to drive in Neutral
•
Engine not able to crank in Park or Neutral
•
Gearshift linkage able to be shifted without the
key in the ignition
•
Not able to remove the ignition key in Reverse
•
Parking pawl not engaging
6
GENERAL INFORMATION
The shift linkage should also be adjusted when
replacing the transmission, repairing the valve
body or repairing any component between the shift
lever and the transmission.
Some questions to ask yourself when considering
the road test are listed below:
•
Is the complaint or concern what you think it is,
based on the driver’s description of the problem?
•
Is the transmission operating normally, or is
there a real problem?
•
When does the malfunction occur?
•
Is the problem in only one gear range?
•
What temperature does the complaint occur?
•
Is the transmission in limp-in mode?
4.3.3
BULLETINS AND RECALLS
The service procedures contained in this manual
are correct, provided that all applicable Safety
Recalls and Technical Service Bulletins have been
performed. Perform a Dial Function 70 to retrieve a
recall history for the vehicle being serviced.
5.0
REQUIRED TOOLS AND
EQUIPMENT
> DRBIII
t (diagnostic read-out box) - DRBIIIt
must use the most current software release
level.
> Jumper wires
> Ohmmeter
> Voltmeter
6.0
GLOSSARY OF TERMS
6.1
ACRONYMS
BCM
Body Control Module
CARB
California Air Resource Board
CCD
Chrysler Collision Detection (com-
munication bus)
CKT
Circuit
DLC
Data Link Connector
CVI
Clutch Volume Index
DLC
Data Link Connector
DRBIII
t
Diagnostic Readout Box
DTC
Diagnostic Trouble Code
IOD
Ignition off-draw
ISS
Input Speed Sensor
LED
Light Emitting Diode
L-R
Low/reverse Clutch
LU
Lockup
MIL
Malfunction Indicator Lamp
OD
Overdrive
OSS
Output Speed Sensor
PCM
Powertrain Control Module
REV
Reverse
SW
Switch
TCC
Torque Converter Clutch
TCM
Transmission Control Module
TPS
Throttle Position Sensor
TRS
Transmission Range Sensor
UD
Underdrive
VSS
Vehicle Speed Sensor
6.2
DEFINITIONS
OBDII Trip - A vehicle start and drive cycle such
that all once per trip diagnostic monitors have run.
Key Start - A vehicle start and run cycle of at least
20 seconds.
Warm-up Cycle - A vehicle start and run cycle
such that the engine coolant must rise to at least
160°F and must rise by at least 40°F from initial
start up. To count as a warm-up cycle, no faults may
occur during the cycle.
7
GENERAL INFORMATION
NOTES
8
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