1993 CHEVROLET DYNASTY Service Manual

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Page 393 of 2438

CHEVROLET DYNASTY 1993 Service Manual (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

Page 394 of 2438

CHEVROLET DYNASTY 1993 Service Manual (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 v

Page 395 of 2438

CHEVROLET DYNASTY 1993 Service Manual FAULT CODESÐON BOARD DIAGNOSTICS INDEX
page page
Diagnostic Testing Using Fault Codes ......... 24
Drb II Diagnostic Tester ................... 24 General Description/Information
..............

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

Page 396 of 2438

CHEVROLET DYNASTY 1993 Service Manual 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 faul

Page 397 of 2438

CHEVROLET DYNASTY 1993 Service Manual Fig. 9 Check For Inadequate/Low Charging
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 25

Page 398 of 2438

CHEVROLET DYNASTY 1993 Service Manual Fig. 10 Check For Overcharging
8A - 26 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

Page 399 of 2438

CHEVROLET DYNASTY 1993 Service Manual Fig. 11 Generator Wiring Connections
Fig. 12 Powertrain Control Module Connector
Fig. 13 Electrical Resistance Test
Ä BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS 8A - 27

Page 400 of 2438

CHEVROLET DYNASTY 1993 Service Manual SPECIFICATIONS
STARTER/BATTERY
GENERATOR AMPERAGE/IDENTIFICATION NUMBERS
8A - 28 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS Ä

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