Jeep Wrangler TJ. Manual — part 330
VACUUM RESERVOIR
DESCRIPTION
The vacuum reservoir is a plastic storage tank con-
nected to an engine vacuum source by vacuum lines.
OPERATION
The vacuum reservoir is used to supply the vac-
uum needed to maintain proper speed control opera-
tion when engine vacuum drops, such as in climbing
a grade while driving. A one-way check valve is used
in the vacuum line between the reservoir and the
vacuum source. This check valve is used to trap
engine vacuum in the reservoir. On certain vehicle
applications, this reservoir is shared with the heat-
ing/air-conditioning system. The vacuum reservoir
cannot be repaired and must be replaced if faulty.
DIAGNOSIS AND TESTING - VACUUM
RESERVOIR
(1) Disconnect vacuum hose at speed control servo
and install a vacuum gauge into the disconnected
hose.
(2) Start engine and observe gauge at idle. Vac-
uum gauge should read at least ten inches of mer-
cury.
(3) If vacuum is less than ten inches of mercury,
determine source of leak. Check vacuum line to
engine for leaks. Also check actual engine intake
manifold vacuum. If manifold vacuum does not meet
this requirement, check for poor engine performance
and repair as necessary.
(4) If vacuum line to engine is not leaking, check
for leak at vacuum reservoir. To locate and gain
access to reservoir, refer to Vacuum Reservoir Remov-
al/Installation in this group. Disconnect vacuum line
at reservoir and connect a hand-operated vacuum
pump to reservoir fitting. Apply vacuum. Reservoir
vacuum should not bleed off. If vacuum is being lost,
replace reservoir.
(5) Verify operation of one-way check valve and
check it for leaks.
(a) Locate one-way check valve. The valve is
located in vacuum line between vacuum reservoir
and engine vacuum source. Disconnect vacuum
hoses (lines) at each end of valve.
(b) Connect a hand-operated vacuum pump to
reservoir end of check valve. Apply vacuum. Vac-
uum should not bleed off. If vacuum is being lost,
replace one-way check valve.
(c) Connect a hand-operated vacuum pump to
vacuum source end of check valve. Apply vacuum.
Vacuum should flow through valve. If vacuum is
not flowing, replace one-way check valve. Seal the
fitting at opposite end of valve with a finger and
apply vacuum. If vacuum will not hold, diaphragm
within check valve has ruptured. Replace valve.
REMOVAL
The vacuum reservoir is located under the vehicle
battery tray (Fig. 6).
(1) Remove battery and battery tray. Refer to Bat-
tery Removal/Installation.
(2) Disconnect vacuum supply line at reservoir
(Fig. 6).
(3) Remove screw securing reservoir to inner
fender.
(4) Remove reservoir from vehicle.
INSTALLATION
The vacuum reservoir is located under the vehicle
battery tray (Fig. 6).
(1) Position reservoir to vehicle and install mount-
ing screw.
(2) Tighten screw to 1.2 N·m (10 in. lbs.) torque.
(3) Connect vacuum line to reservoir.
(4) Install battery and battery tray. Refer to Bat-
tery Removal/Installation.
Fig. 6 Vacuum Reservoir Removal/Installation
1 - SCREW
2 - VACUUM CHECK VALVE (2)
3 - VACUUM LINE RETAINER (2)
4 - ACCESSORY VACUUM SUPPLY LINE
5 - ENGINE VACUUM FITTING
6 - HVAC VACUUM SUPPLY LINE
7 - INNER FENDER
8 - VACUUM RESERVOIR
TJ
SPEED CONTROL
8P - 7
VEHICLE THEFT SECURITY
TABLE OF CONTENTS
page
page
VEHICLE THEFT SECURITY
. . . . . . . . . . . . . . . . . . . . . . . . . . 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING - SENTRY KEY
. . . . . . . . . . . . . . . . . . 2
INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . . 4
STANDARD PROCEDURE - SENTRY KEY
TRANSPONDER PROGRAMMING . . . . . . . . . . 4
SKIS INDICATOR
. . . . . . . . . . . . . . . . . . . . . . . . . . 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
TRANSPONDER KEY
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
VEHICLE THEFT SECURITY
DESCRIPTION
The Sentry Key Immobilizer System (SKIS) is
available as a factory-installed option on this model.
Vehicles equipped with this option can be readily
identified by the presence of an amber SKIS indica-
tor in the instrument cluster that will illuminate for
about three seconds each time the ignition switch is
turned to the On position, or by a gray molded rub-
ber cap on the head of the ignition key. Models not
equipped with SKIS still have a SKIS indicator in
the cluster, but it will not illuminate when the igni-
tion switch is turned to the On position. Also, models
not equipped with the SKIS have a black molded
rubber cap on the head of the ignition key.
The SKIS includes the following major components,
which are described in further detail elsewhere in
this service manual:
• Powertrain Control Module (PCM) - The
PCM is located on the right side of the dash panel in
the engine compartment.
• Sentry Key Immobilizer Module (SKIM) -
The SKIM is located on the steering column near the
ignition lock cylinder housing and an integral molded
plastic antenna ring circles the ignition lock cylinder
like a halo. The SKIM and its antenna are concealed
beneath the steering column shrouds.
• Sentry Key Transponder - The Sentry Key
transponder is molded into the head of the ignition
key, and concealed by a gray molded rubber cap.
• SKIS Indicator - The SKIS indicator is located
in the upper left corner of the instrument cluster
overlay.
Except for the Sentry Key transponders, which rely
upon Radio Frequency (RF) communication, hard
wired circuitry connects the SKIS components to the
electrical system of the vehicle. These hard wired cir-
cuits are integral to several wire harnesses, which
are routed throughout the vehicle and retained by
many different methods. These circuits may be con-
nected to each other, to the vehicle electrical system
and to the SKIS components through the use of a
combination of soldered splices, splice block connec-
tors, and many different types of wire harness termi-
nal
connectors
and
insulators.
Refer
to
the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, further details on wire
harness routing and retention, as well as pin-out and
location views for the various wire harness connec-
tors, splices and grounds.
OPERATION
The Sentry Key Immobilizer System (SKIS) is
designed to provide passive protection against unau-
thorized vehicle use by disabling the engine, after
about two seconds of running, whenever any method
other than a valid Sentry Key is used to start the
vehicle. The SKIS is considered a passive protection
system because it is always active when the ignition
system is energized and does not require any cus-
tomer intervention. The SKIS uses Radio Frequency
(RF) communication to obtain confirmation that the
key in the ignition switch is a valid key for operating
the vehicle. The microprocessor-based SKIS hard-
ware and software also uses electronic messages to
communicate with other electronic modules in the
vehicle
over
the
Programmable
Communications
Interface (PCI) data bus (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/COMMUNI-
CATION - OPERATION).
TJ
VEHICLE THEFT SECURITY
8Q - 1
Pre-programmed Sentry Key transponders are pro-
vided with the vehicle from the factory. Each Sentry
Key Immobilizer Module (SKIM) will recognize a
maximum of eight Sentry Keys. If the customer
would like additional keys other than those provided
with the vehicle, they may be purchased from any
authorized dealer. These additional keys must be pro-
grammed to the SKIM in the vehicle in order for the
system to recognize them as valid keys. This can be
done by the dealer using a DRBIII
t scan tool or, if
Customer Learn programming is an available SKIS
feature in the market where the vehicle was pur-
chased, the customer can program the additional
keys, as long as at least two valid Sentry Keys are
already available. (Refer to 8 - ELECTRICAL/VEHI-
CLE THEFT SECURITY - STANDARD PROCE-
DURE
-
SENTRY
KEY
TRANSPONDER
PROGRAMMING).
The SKIS performs a self-test each time the igni-
tion switch is turned to the On position, and will
store fault information in the form of Diagnostic
Trouble Codes (DTC’s) if a system malfunction is
detected. The SKIS can be diagnosed, and any stored
DTC’s can be retrieved using a DRBIII
t scan tool.
Refer to the appropriate diagnostic information.
DIAGNOSIS AND TESTING - SENTRY KEY
IMMOBILIZER SYSTEM
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
SENTRY KEY IMMOBILIZER SYSTEM DIAGNOSIS
CONDITION
POSSIBLE CAUSES
CORRECTION
SKIS INDICATOR FAILS TO
LIGHT DURING BULB TEST
1. Indicator faulty.
1. Test and replace the faulty instrument cluster
or bulb as required.
2. Fuse faulty.
2. Test and replace the SKIM fused B(+) and
fused ignition switch output (run-start) fuses in the
fuse block as required.
3. Ground circuit faulty.
3. Test and repair the SKIM ground circuit as
required.
4. Fused B(+) circuit faulty.
4. Test and repair the SKIM fused B(+) circuit as
required.
5. Fised ignition switch
output circuit faulty.
5. Terst and repair the SKIM fused ignition switch
output (run-start) circuit as required.
SKIS INDICATOR FLASHES
WHEN IGNITION SWITCH IS
TURNED TO THE
9
ON
9
POSITION
1. Invalid key in ignition
switch lock cylinder.
1. Replace the key with a known valid key.
2. Key-related fault.
2. Use a DRBIII
T
scan tool to diagnose the
key-related fault. Refer to the appropriate
diagnostic information.
SKIS INDICATOR LIGHTS
SOLID FOLLOWING BULB
TEST
1. SKIS system malfunction/
fault detected.
1. Use a DRBIII
T
scan tool to diagnose the SKIS.
Refer to the appropriate diagnostic information.
8Q - 2
VEHICLE THEFT SECURITY
TJ
VEHICLE THEFT SECURITY (Continued)
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