charging CHEVROLET DYNASTY 1993 Owner's Guide

(5) Connect an engine tachometer and connect bat-
tery negative cable. (6) Connect a volt/amp tester equipped with a vari-
able carbon pile rheostat between battery terminals
(Fig. 6). Be sure carbon pile is in OFF position before
connecting leads. (7) Remove fresh air hose between Powertrain
Control Module computer and air cleaner if neces-
sary. (8) Full field the generator. Connect a jumper wire
between a good ground and K20 circuit terminal at
the back of the generator (Figs. 2 and 5).
CAUTION: Do not connect the A142 circuit terminal
(Fig. 2) to ground. Fusible link will burn.
TEST
(1) Start the engine. Immediately after starting,
reduce engine speed to idle.
Fig. 2 Generator Wiring Connections
Fig. 3 Generator Output Wire Resistance Test
Fig. 4 Volt/Amp Tester Connections
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 21

(2) Adjust the carbon pile and engine speed in
steps until an engine speed of 1250 rpm, and a volt-
meter reading of 15 volts is obtained.
CAUTION: Do not allow the battery voltage to ex-
ceed 16 volts. (3) The generator amperage must meet the output
requirements for the particular generator being
tested. Refer to Generator Specifications for genera-
tor identification and amperage outputs.
RESULTS
(1) If amperage reading is less than specified, and
generator output wire resistance is not found exces-
sive from the previous tests, generator should be re-
placed. Refer to Group 8B, Battery/Starter/Generator
Service, Generator Replacement. These generators
are not intended to be disassembled for service. It
must be replaced as an assembly. (2) After current output test is completed, reduce
engine speed, turn off carbon pile, and turn off igni-
tion switch. (3) Disconnect battery negative cable.
(4) Remove test ammeter, voltmeter, tachometer
and carbon pile. (5) Remove jumper wire between K20 circuit ter-
minal and ground. (6) Connect output wire to B+ terminal.
(7) Connect negative battery cable.
(8) Connect fresh air hose between powertrain con-
trol module and air cleaner if removed.
Fig. 5 Generator Current Output Test
Fig. 6 Volt/Amp Tester Connections
8A - 22 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

FAULT CODESÐON BOARD DIAGNOSTICS INDEX
page page
Diagnostic Testing Using Fault Codes ......... 24
Drb II Diagnostic Tester ................... 24 General Description/Information
.............. 23
GENERAL DESCRIPTION/INFORMATION
Another way of diagnosing charging system prob-
lems can be accomplished using the On Board Diag-
nostic System Fault Codes. A Fault Code shows a potential problem in a mon-
itored circuit, or a condition caused by a faulty component. A
Fault Code can be retrieved by turning the ignition
switch ON-OFF-ON-OFF-ON without starting the
engine, and counting the number of flashes of the
Malfunction Indicator (CHECK ENGINE) Lamp in
the instrument cluster.
EXAMPLES:
² If the Malfunction Indicator (Check Engine) Lamp
flashes four times, pauses, and flashes one more
time, a Code 41 is shown. The first set of four flashes
indicates number four. The second set of one flash in-
dicates one.
² If the Malfunction Indicator (Check Engine) Lamp
flashes four times, pauses, and flashes six more
times, a Code 46 is shown. The first set of four
flashes indicates number four. The second set of six
flashes indicates six.
² If the Malfunction Indication (Check Engine)
Lamp flashes four times, pauses, and flashes seven
more times, a Code 47 is shown. The first set of four
flashes indicates number four. The second set of
seven flashes indicates seven. POWERTRAIN CONTROL MODULE
The Powertrain Control Module is equipped with
On Board Diagnostic features and monitors all en-
gine control circuits during a run/drive period. If a
circuit or system does not perform properly, the pow-
ertrain control module will file in memory a preset
Fault Code. This can be used to help in diagnosing a
problem. After 50 to 100 ignition switch ON/RUN cy-
cles, the memory will be erased if the fault does not
reoccur. The Powertrain Control Module is located in the
engine compartment outboard of the battery (Fig. 7).
Refer to Fig. 8 Generator Fault Codes Chart for re-
lationships of generator/charging system Fault Code
numbers.
Fig. 7 Powertrain Control Module
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 23

DIAGNOSTIC TESTING USING FAULT CODES
For diagnostic testing when using the fault codes,
refer to Fig.9 through 13.
DRB II DIAGNOSTIC TESTER
TESTING FAULT CODES
A more accurate device to retrieve fault codes is
Diagnostic Tool (DRB II). This diagnostic tool,
plugged into the diagnostic connector (Fig. 7) located
near the battery, will display fault descriptions. The
DRB II also can test various circuits and component
functions. Refer to the instructions provided with the
(DRB II) tool being used. Descriptions of Fault Codes
for other vehicle systems can be found in the General
Diagnosis sections of Group 14, Fuel System.
Fig. 8 Generator Fault Codes
8A - 24 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

Fig. 9 Check For Inadequate/Low Charging
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 25

Fig. 10 Check For Overcharging
8A - 26 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

Fig. 11 Generator Wiring Connections
Fig. 12 Powertrain Control Module Connector
Fig. 13 Electrical Resistance Test
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 27

SPECIFICATIONS
STARTER/BATTERY
GENERATOR AMPERAGE/IDENTIFICATION NUMBERS
8A - 28 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

TORQUE SPECIFICATIONS
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 29

BATTERY/STARTER/GENERATOR SERVICE
CONTENTS
page page
BATTERY REMOVAL, INSTALLATION AND SERVICE ............................. 1
GENERATOR ............................ 9 SPECIFICATIONS
....................... 12
STARTER ............................... 4
BATTERY REMOVAL, INSTALLATION AND SERVICE
GENERAL INFORMATION
This first section will cover Battery replacement and
service procedures only. For Battery diagnostic proce-
dures, refer to Group 8A, Battery/Starting/Charging
Systems Diagnostics. Factory installed batteries (Fig. 1) do not have re-
movable battery cell caps. Water cannot be added to
factory installed battery. Battery is sealed, except for
small vent holes in the top. Chemical composition
inside the battery produces an extremely small amount
of gases at normal charging voltages. The factory
installed battery is equipped with a test indicator that
displays a colored ball to show the battery's state of
charge.
² Green Indicator = Full charge
² Black Indicator = Discharged
² Yellow Indicator = Battery replacement required.
BATTERY VISUAL INSPECTION AND SERVICE
(1) Make sure ignition switch is in OFF position and
all accessories are OFF. (2) Disconnect and remove the battery cable termi-
nals from the battery posts. Remove negative cable
first (Fig. 2). WARNING: TO PROTECT THE HANDS FROM BAT-
TERY ACID, A SUITABLE PAIR OF HEAVY DUTY
RUBBER GLOVES, NOT THE HOUSEHOLD TYPE,
SHOULD BE WORN WHEN REMOVING OR SERVIC-
ING A BATTERY. SAFETY GLASSES ALSO SHOULD
BE WORN.
(3) Lift battery heat shield off battery, if equipped
(Fig. 3). (4) Remove battery hold down nut and clamp.
Fig. 1 Maintenance Free Battery
Fig. 2 Remove Battery Cables
Fig. 3 Battery Hold-Down
Ä BATTERY/STARTER/GENERATOR SERVICE 8B - 1