Dodge RAM TRUCK 1500 1995 Service Manual page 334

BR
ELECTRICAL
ELECTRICAL 8A 1
G R O U P I N D E X
group group
AUDIO SYSTEMS . . . 8F
POWER LOCKS
8P
BATTERY/STARTER/GENERATOR SERVICE . . . . 8B POWER MIRRORS
. . . . 8T
BATTERY/STARTING/CHARGING SYSTEMS POWER SEATS . . . . 8R
DIAGNOSTICS . . . 8A POWER WINDOWS 8S
CHIME/BUZZER WARNING SYSTEMS . . . 8U RESTRAINT SYSTEMS
8M
HORNS . . . 8G TURN SIGNAL AND HAZARD WARNING
IGNITION SYSTEMS . . . 8D SYSTEMS . . 8J
INSTRUMENT PANEL AND GAUGES . . . 8E VEHICLE SPEED CONTROL SYSTEM
. . . . 8H
LAMPS . . . 8L WIPER AND WASHER SYSTEMS . « . . 8K
OVERHEAD CONSOLE
. . . 8C WIRING DIAGRAMS . . . 8W
BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS
I
C O N T E N T S
BATTERY
CHARGING SYSTEM
IGNITION-OFF DRAW
page
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. . . 1 8
. . . 10
GENERAL INFORMATION
The battery, starting, and charging systems operate
with one another; therefore, they must be tested as a
complete system. In order for the vehicle to start and
charge properly, all of the components involved in
these systems must perform within specifications.
Group 8A covers battery, starting (Fig. 1) and
charging (Fig. 2) system diagnostic procedures. These
procedures include the most basic conventional diag­
nostic methods, to On-Board Diagnostics (OBD) built
into the Powertrain Control Module (PCM). Use of an
induction milliamp ammeter, volt/ohmmeter, battery
charger, carbon pile rheostat (load tester), and 12-
volt test lamp will be required.
All OBD-sensed systems are monitored by the
PCM. Each monitored circuit is assigned a Diagnos­
tic Trouble Code (DTC). The PCM will store a DTC in
electronic memory for any failure it detects. See Us-
SPECiFlClTiOlS
STARTING SYSTE1
USING ON-BOARD DIAGNOSTIC SYSTEM
page
. . . 2 3
. . . 1 1
. . . 22
IGNITION SWITCH
r CLUTCH PEDAL 1
^ POSITION SWITCH |
''^PARK/NEUTRAL P O S I T I O N ^
SWITCH |
. .^.^.J
STARTER RELAY
J958A-13
Fig. 1 Starting System Components - Typical
ing On-Board Diagnostic System in this group for
more information.