COLD CRANKING TEST
For circuit descriptions and diagrams, refer to
8W-21 - Starting System in Group 8W - Wiring Dia-
grams. The battery must be fully-charged and load-
tested before proceeding. Refer to Group 8A - Battery
for more information.
(1) Connect a suitable volt-ampere tester to the
battery terminals (Fig. 1). Refer to the operating
instructions provided with the tester being used.
(2) Fully engage the parking brake.
(3) If the vehicle is equipped with an automatic
transmission, place the gearshift selector lever in the
Park position. If the vehicle is equipped with a man-
ual transmission, place the gearshift selector lever in
the Neutral position and fully depress the clutch
pedal.
(4) Verify that all lamps and accessories are
turned off.
(5) Unplug the Automatic ShutDown (ASD) relay
to prevent a gasoline engine from starting. The ASD
relay is located in the Power Distribution Center
(PDC). Refer to the PDC label for ASD relay identi-
fication and location. To prevent a diesel engine from
starting, unplug the fuel shut off solenoid wire har-
ness connector (Fig. 2).
(6) Rotate and hold the ignition switch in the Start
position. Note the cranking voltage and current
(amperage) draw.
(a) If the voltage reads below 9.6 volts, remove
the starter for bench testing. If the starter bench
test is OK, refer to Group 9 - Engine for further
diagnosis of the engine. If the starter bench test is
not OK, replace the faulty starter.
(b) If the voltage reads above 9.6 volts and the
current (amperage) draw reads below specifica-
tions, see the Feed Circuit Test procedures in this
group.
(c) If the voltage reads 12.5 volts or greater and
the starter does not turn, see the Control Circuit
Test procedures in this group.
(d) If the voltage reads 12.5 volts or greater and
the starter turns very slowly, see the Feed Circuit
Test procedures in this group.
NOTE: A cold engine will increase the starter cur-
rent (amperage) draw reading, and reduce the bat-
tery voltage reading.
FEED CIRCUIT TEST
The starter feed circuit test (voltage drop method)
will determine if there is excessive resistance in the
high-amperage circuit. For circuit descriptions and
diagrams, refer to 8W-21 - Starting System in Group
8W - Wiring Diagrams.
When performing these tests, it is important to
remember that the voltage drop is giving an indica-
tion of the resistance between the two points at
which the voltmeter probes are attached.
Example: When testing the resistance of the bat-
tery positive cable, touch the voltmeter leads to the
battery positive cable clamp and the cable connector
at the starter solenoid. If you probe the battery pos-
itive terminal post and the cable connector at the
starter solenoid, you are reading the combined volt-
age drop in the battery positive cable clamp-to-termi-
nal post connection and the battery positive cable.
The following operation will require a voltmeter
accurate to 1/10 (0.10) volt. Before performing the
tests, be certain the following procedures are accom-
plished:
Fig. 1 Volts-Amps Tester Connections - Typical
POSITIVE
CLAMP
NEGATIVE
CLAMP
INDUCTION AMMETER
CLAMP
Fig. 2 Fuel Shut Off Solenoid Connector- Diesel
Engine
GENERATOR
FUEL INJECTOR PUMP FUEL SHUT-OFF SOLENOID
FWD
FUEL
SHUT-OFF
SOLENOID
CONNECTOR
ZG
STARTING SYSTEMS
8B - 5
DIAGNOSIS AND TESTING (Continued)
Summary of Contents for 1997 Grand Cherokee
Page 6: ...FASTENER IDENTIFICATION 4 INTRODUCTION ZG GENERAL INFORMATION Continued ...
Page 9: ...METRIC CONVERSION ZG INTRODUCTION 7 GENERAL INFORMATION Continued ...
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Page 286: ...7 12 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
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Page 424: ...VIC Reset 8E 22 INSTRUMENT PANEL SYSTEMS ZG SERVICE PROCEDURES Continued ...
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Page 1655: ...Fig 3 Oil Lubrication System ZG 5 2L ENGINE 9 57 DESCRIPTION AND OPERATION Continued ...
Page 1684: ...TORQUE 9 86 5 2L ENGINE ZG SPECIFICATIONS Continued ...
Page 1689: ...Fig 3 Oil Lubrication System ZG 5 9L ENGINE 9 91 DESCRIPTION AND OPERATION Continued ...
Page 1723: ...DIAGNOSIS AND TESTING SERVICE DIAGNOSIS DIESEL PERFORMANCE ZG ENGINE 9 3 ...
Page 1724: ...9 4 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1725: ...ZG ENGINE 9 5 DIAGNOSIS AND TESTING Continued ...
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Page 1729: ...SERVICE DIAGNOSIS DIESEL MECHANICAL ZG ENGINE 9 9 DIAGNOSIS AND TESTING Continued ...
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Page 1762: ...SPECIFICATIONS ENGINE SPECIFICATIONS 9 42 ENGINE ZG ...
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Page 2122: ...DIAGNOSIS AND TESTING NV231 DIAGNOSIS 21 8 TRANSMISSION AND TRANSFER CASE ZG ...