Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1988-1989.1993-1995 Approved 1994 XJ Jeep Cherokee 94XJ_8A
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J ELECTRICAL 8A - 1
ELECTRICAL
GROUP INDEX
Group Group
AUDIO SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . 8F POWER LOCKS . . . . . . . . . . . . . . . . . . . . . . . . 8P
BATTERY/STARTER/GENERATOR SERVICE . . 8B POWER MIRRORS . . . . . . . . . . . . . . . . . . . . . . 8T
BATTERY/STARTING/CHARGING SYSTEMS POWER SEAT . . . . . . . . . . . . . . . . . . . . . . . . . . 8R
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . 8A POWER WINDOWS . . . . . . . . . . . . . . . . . . . . . 8S
CHIME/WARNING BUZZER SYSTEM . . . . . . . 8U REAR WINDOW DEFOGGER . . . . . . . . . . . . . . 8N
HORNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8G TURN SIGNALS AND HAZARD WARNING
IGNITION SYSTEMS . . . . . . . . . . . . . . . . . . . . 8D FLASHERS . . . . . . . . . . . . . . . . . . . . . . . . . . . 8J
INSTRUMENT PANEL AND GAUGES . . . . . . . . 8E VEHICLE SPEED CONTROL SYSTEM . . . . . . . 8H
LAMPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8L WINDSHIELD WIPERS AND WASHERS . . . . . 8K
OVERHEAD CONSOLE . . . . . . . . . . . . . . . . . . . 8C WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . 8W
BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
CONTENTS
page page
BATTERY TEST PROCEDURES . . . . . . . . . . . . . 2 GENERATOR TEST PROCEDURES ON
ENGINE STARTER MOTOR TEST VEHICLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PROCEDURES ON VEHICLE . . . . . . . . . . . . . . 9 IGNITION OFF DRAW (IOD) DIAGNOSIS . . . . . . 8
USING ON-BOARD DIAGNOSTIC SYSTEM . . . . 19
GENERAL INFORMATION
The battery, starting, and charging systems oper-
ate with one another, and therefore, must be thor-
oughly tested as a complete system. In order for the
vehicle to start and charge properly, it must have a
battery that will perform to specifications. The
starter motor, generator, wiring, and electronics also
must perform within specifications. Group 8A covers
starting (Fig. 1) and charging (Fig. 2) system diag-
nostic procedures. These procedures include the most
basic conventional methods to On-Board Diagnostics
(OBD) built into the Powertrain Control Module
(PCM). Use of an ammeter, volt/ohmmeter, battery
charger, carbon pile rheostat (load tester), and 12-
volt test lamp will be required.
All OBD sensing systems are monitored by the
PCM. The PCM will store in memory any detectable Fig. 1 Starting System Components (Typical)
failure in the monitored circuits. Refer to Using On-
Board Diagnostic System in this group for more in-
formation.
8A - 2 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS J
Fig. 2 Charging System Components
BATTERY TEST PROCEDURES
INDEX
page page
Battery Charging . . . . . . . . . . . . .... . . . . . . . . . . 5 Battery Testing General Information . . . . . . . . . . . 3
Battery Diagnostics Chart . . . . . .... . . . . . . . . . . 7 General Information . . ............ . . . . . . . . . . 2
Battery Load Test . . . . . . . . . . . .... . . . . . . . . . . 4 Hydrometer Test . . . . ............ . . . . . . . . . . 3
Battery Open Circuit Voltage Test ... . . . . . . . . . . 3 Specifications . . . . . . ............ . . . . . . . . . . 8
GENERAL INFORMATION posts, and terminals should be cleaned when other
The battery stores, stabilizes, and produces electri- underhood maintenance is performed.
cal current. A battery must be able to accept a
charge and produce high-amperage current output WARNING: DO NOT ATTEMPT TO ASSIST BOOST,
over an extended period. A chemical reaction occurs CHARGE, OR TEST BATTERY WHEN ELECTRO-
between the sulfuric acid solution (electrolyte) and LYTE LEVEL IS BELOW THE TOP OF THE PLATES.
the lead +/- plates in each cell of the battery. As PERSONAL INJURY MAY OCCUR.
the battery discharges, the plates collect the acid
from the electrolyte. When the charging system When the electrolyte level is below the top of the
charges the battery, water is converted to sulfuric plates distilled water should be added. The battery
acid in the battery. The amount of acid (specific must be completely charged. The top, posts, and ter-
gravity) in the electrolyte can be measured with a minals should be properly cleaned before diagnostic
hydrometer. The battery is vented to release gases procedures are performed. See Group 8B - Battery/
that are created when the battery is being charged. Starter/Generator Service, for additional information.
The battery top,
J BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 3
BATTERY TESTING GENERAL INFORMATION to avoid damage to the separators. Damaged separa-
Before testing a battery, clean the top of the tors can cause premature battery failure.
battery case, posts and cable terminals. Hydrometer floats are generally calibrated to indi-
Specific gravity is a ratio of the density of the elec- cate the specific gravity correctly only at one fixed
trolyte and the density of pure water. The electrolyte temperature, 80◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo