Jeep 1997 Grand Cherokee Service Manual page 324

FUEL GENERATOR SHUT-OFF FUEL INJECTOR PUMP FUEL SHUT-OFF SOLENOID CONNECTOR SOLENOID
8B - 6 STARTING SYSTEMS
DIAGNOSIS AND TESTING (Continued)
• Battery is fully-charged. Refer to Group 8A -
Battery for more information.
• Fully engage the parking brake.
• 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.
• 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. 3).
Fig. 3 Fuel Shut Off Solenoid Connector- Diesel
(1) Connect the positive lead of the voltmeter to
the battery negative terminal post. Connect the neg-
ative lead of the voltmeter to the battery negative
cable clamp (Fig. 4). Rotate and hold the ignition
switch in the Start position. Observe the voltmeter. If
voltage is detected, correct the poor contact between
the cable clamp and the terminal post.
(2) Connect the positive lead of the voltmeter to
the battery positive terminal post. Connect the nega-
tive lead of the voltmeter to the battery positive cable
clamp (Fig. 5). Rotate and hold the ignition switch in
the Start position. Observe the voltmeter. If voltage
is detected, correct the poor contact between the
cable clamp and the terminal post.
(3) Connect the voltmeter to measure between the
battery positive terminal post and the starter sole-
Engine
FWD
Fig. 4 Test Battery Negative ConnectionResistance -
Fig. 5 Test Battery Positive ConnectionResistance -
noid battery terminal stud (Fig. 6). Rotate and hold
the ignition switch in the Start position. Observe the
voltmeter. If the reading is above 0.2 volt, clean and
tighten the battery cable connection at the solenoid.
Repeat the test. If the reading is still above 0.2 volt,
replace the faulty battery positive cable.
(4) Connect the voltmeter to measure between the
battery negative terminal post and a good clean
ground on the engine block (Fig. 7). Rotate and hold
the ignition switch in the Start position. Observe the
voltmeter. If the reading is above 0.2 volt, clean and
tighten the battery negative cable attachment on the
engine block. Repeat the test. If the reading is still
above 0.2 volt, replace the faulty battery negative
cable.
(5) Connect the positive lead of the voltmeter to
the starter housing. Connect the negative lead of the
voltmeter to the battery negative terminal post (Fig.
8). Rotate and hold the ignition switch in the Start
position. Observe the voltmeter. If the reading is
VOLTMETER VOLTMETER
Typical
Typical
BATTERY BATTERY
ZG