Electrical JEEP LIBERTY 2002 KJ / 1.G Workshop Manual

Fig. 21 OXYGEN SENSORS - UPSTREAM - 3.7L
1 - RIGHT UPSTREAM SENSOR (2/1)
2 - ELECTRICAL CONNECTORS3 - LEFT UPSTREAM SENSOR (1/1)
4 - ELECTRICAL CONNECTORS
Fig. 22 OXYGEN SENSORS - DOWNSTREAM - 3.7L
1 - ELECTRICAL CONNECTORS
2 - ELECTRICAL CONNECTORS3 - LEFT DOWNSTREAM SENSOR (1/2)
4 - RIGHT DOWNSTREAM SENSOR (2/2)
14 - 42 FUEL INJECTIONKJ
OXYGEN SENSOR (Continued)

WARNING: THE EXHAUST MANIFOLD, EXHAUST
PIPES AND CATALYTIC CONVERTER BECOME
VERY HOT DURING ENGINE OPERATION. ALLOW
ENGINE TO COOL BEFORE REMOVING OXYGEN
SENSOR.
(1) Raise and support vehicle.
(2) Disconnect wire connector from O2S sensor.
CAUTION: When disconnecting sensor electrical
connector, do not pull directly on wire going into
sensor.
(3) Remove O2S sensor with an oxygen sensor
removal and installation tool.
(4) Clean threads in exhaust pipe using appropri-
ate tap.
INSTALLATION
Threads of new oxygen sensors are factory coated
with anti-seize compound to aid in removal.DO
NOT add any additional anti-seize compound to
threads of a new oxygen sensor.
(1) Install O2S sensor. Tighten to 30 N´m (22 ft.
lbs.) torque.
(2) Connect O2S sensor wire connector.
(3) Lower vehicle.
THROTTLE BODY
DESCRIPTION
The throttle body is located on the intake manifold.
Fuel does not enter the intake manifold through the
throttle body. Fuel is sprayed into the manifold by
the fuel injectors.
OPERATION
Filtered air from the air cleaner enters the intake
manifold through the throttle body. The throttle body
contains an air control passage controlled by an Idle
Air Control (IAC) motor. The air control passage is
used to supply air for idle conditions. A throttle valve
(plate) is used to supply air for above idle conditions.
Certain sensors are attached to the throttle body.
The accelerator pedal cable, speed control cable and
transmission control cable (when equipped) are con-
nected to the throttle body linkage arm.
A (factory adjusted) set screw is used to mechani-
cally limit the position of the throttle body throttle
plate.Never attempt to adjust the engine idle
speed using this screw.All idle speed functions are
controlled by the PCM.
REMOVAL
2.4L
A (factory adjusted) set screw is used to mechani-
cally limit the position of the throttle body throttle
plate.Never attempt to adjust the engine idle
speed using this screw.All idle speed functions are
controlled by the Powertrain Control Module (PCM).
(1) Remove air cleaner tube at throttle body.
(2) Disconnect throttle body electrical connectors
at IAC motor and TPS.
(3) Remove all control cables from throttle body
(lever) arm. Refer to the Accelerator Pedal and Throt-
tle Cable section for removal/installation procedures.
(4) Disconnect necessary vacuum lines at throttle
body.
(5) Remove 3 throttle body mounting bolts (Fig.
23).
(6) Remove throttle body from intake manifold.
(7) Check condition of old throttle body-to-intake
manifold o-ring.
3.7L
A (factory adjusted) set screw is used to mechani-
cally limit the position of the throttle body throttle
plate.Never attempt to adjust the engine idle
speed using this screw.All idle speed functions are
controlled by the Powertrain Control Module (PCM).
(1) Remove air cleaner tube at throttle body.
(2) Disconnect throttle body electrical connectors
at IAC motor and TPS.
Fig. 23 THROTTLE BODY MOUNTING BOLTS - 2.4L
1 - THROTTLE BODY
2 - IGNITION COIL
3 - MOUNTING BOLTS (3)
KJFUEL INJECTION 14 - 43
OXYGEN SENSOR (Continued)

(3) Remove all control cables from throttle body
(lever) arm. Refer to the Accelerator Pedal and Throt-
tle Cable section for removal/installation procedures.
(4) Disconnect necessary vacuum lines at throttle
body.
(5) Remove 3 throttle body mounting bolts (Fig.
24).
(6) Remove throttle body from intake manifold.
(7) Check condition of old throttle body-to-intake
manifold o-ring (Fig. 25).
INSTALLATION
2.4L
(1) Check condition of throttle body-to-intake man-
ifold o-ring. Replace as necessary.
(2) Clean mating surfaces of throttle body and
intake manifold.(3) Install throttle body-to-intake manifold o-ring.
(4) Install throttle body to intake manifold.
(5) Install 3 mounting bolts. Tighten bolts to 12
N´m (105 in. lbs.) torque.
(6) Install control cables.
(7) Install electrical connectors.
(8) Install necessary vacuum lines.
(9) Install air cleaner duct at throttle body.
3.7L
(1) Check condition of throttle body-to-intake man-
ifold o-ring. Replace as necessary.
(2) Clean mating surfaces of throttle body and
intake manifold.
(3) Install throttle body-to-intake manifold o-ring.
(4) Install throttle body to intake manifold.
(5) Install 3 mounting bolts. Tighten bolts to 12
N´m (105 in. lbs.) torque.
(6) Install control cables.
(7) Install electrical connectors.
(8) Install necessary vacuum lines.
(9) Install air cleaner duct at throttle body.
Fig. 24 THROTTLE BODY MOUNTING BOLTS - 3.7L
1 - THROTTLE BODY
2 - MOUNTING BOLTS (3)
Fig. 25 THROTTLE BODY O-RING - 3.7L
1 - INTAKE MANIFOLD
2 - THROTTLE BODY O-RING
14 - 44 FUEL INJECTIONKJ
THROTTLE BODY (Continued)

THROTTLE POSITION SENSOR
DESCRIPTION
The 3±wire Throttle Position Sensor (TPS) is
mounted on the throttle body and is connected to the
throttle blade shaft.
OPERATION
The 3±wire TPS provides the Powertrain Control
Module (PCM) with an input signal (voltage) that
represents the throttle blade position of the throttle
body. The sensor is connected to the throttle blade
shaft. As the position of the throttle blade changes,
the output voltage of the TPS changes.
The PCM supplies approximately 5 volts to the
TPS. The TPS output voltage (input signal to the
PCM) represents the throttle blade position. The
PCM receives an input signal voltage from the TPS.
This will vary in an approximate range of from .26
volts at minimum throttle opening (idle), to 4.49 volts
at wide open throttle. Along with inputs from other
sensors, the PCM uses the TPS input to determine
current engine operating conditions. In response to
engine operating conditions, the PCM will adjust fuel
injector pulse width and ignition timing.
The PCM needs to identify the actions and position
of the throttle blade at all times. This information is
needed to assist in performing the following calcula-
tions:
²Ignition timing advance
²Fuel injection pulse-width
²Idle (learned value or minimum TPS)
²Off-idle (0.06 volt)
²Wide Open Throttle (WOT) open loop (2.608
volts above learned idle voltage)
²Deceleration fuel lean out
²Fuel cutoff during cranking at WOT (2.608 volts
above learned idle voltage)
²A/C WOT cutoff (certain automatic transmis-
sions only)
REMOVAL
2.4L
The Throttle Position Sensor (TPS) is mounted to
the throttle body (Fig. 31).
(1) Disconnect TPS electrical connector.
(2) Remove 2 TPS mounting screws.
(3) Remove TPS.
Fig. 31 TPS/IAC MOTOR - 2.4L
1 - THROTTLE POSITION SENSOR (TPS)
2 - MOUNTING SCREWS
3 - IDLE AIR CONTROL MOTOR (IAC)
4 - MOUNTING SCREWS
KJFUEL INJECTION 14 - 47

3.7L
The Throttle Position Sensor (TPS) is mounted to
the throttle body (Fig. 32), or (Fig. 33).
(1) Disconnect TPS electrical connector.
(2) Remove 2 TPS mounting screws.
(3) Remove TPS.
INSTALLATION
2.4L
The Throttle Position Sensor (TPS) is mounted to
the rear of the throttle body.
The throttle shaft end of the throttle body slides
into a socket in the TPS (Fig. 33). The TPS must be
installed so that it can be rotated a few degrees. (If
sensor will not rotate, install sensor with throttle
shaft on other side of socket tangs). The TPS will be
under slight tension when rotated.
(1) Install TPS and retaining screws.
(2) Tighten screws to 7 N´m (60 in. lbs.) torque.
(3) Connect TPS electrical connector to TPS.(4) Manually operate throttle (by hand) to check
for any TPS binding before starting engine.
(5) Install air cleaner tube to throttle body.
3.7L
The Throttle Position Sensor (TPS) is mounted to
the throttle body (Fig. 32).
The throttle shaft end of the throttle body slides
into a socket in the TPS (Fig. 33). The TPS must be
installed so that it can be rotated a few degrees. (If
sensor will not rotate, install sensor with throttle
shaft on other side of socket tangs). The TPS will be
under slight tension when rotated.
(1) Install TPS and retaining screws.
(2) Tighten screws to 7 N´m (60 in. lbs.) torque.
(3) Connect TPS electrical connector to TPS.
(4) Manually operate throttle (by hand) to check
for any TPS binding before starting engine.
(5) Install air cleaner tube to throttle body.
Fig. 32 TPS/IAC MOTOR - 3.7L
1 - THROTTLE POSITION SENSOR (TPS)
2 - MOUNTING SCREWS
3 - IDLE AIR CONTROL MOTOR (IAC)
4 - MOUNTING SCREWS
Fig. 33 TPS INSTALLATION - 3.7
1 - THROTTLE BODY
2 - TPS
3 - THROTTLE BODY SHAFT
4 - SOCKET LOCATING TANGS
14 - 48 FUEL INJECTIONKJ
THROTTLE POSITION SENSOR (Continued)

COLUMN
TABLE OF CONTENTS
page page
COLUMN
DESCRIPTION..........................5
OPERATION - SERVICE PRECAUTIONS......5
REMOVAL.............................5
INSTALLATION..........................7
SPECIFICATIONS
TORQUE CHART......................8
SPECIAL TOOLS
STEERING COLUMN....................8
IGNITION SWITCH
DESCRIPTION..........................8
DIAGNOSIS AND TESTING - IGNITION
SWITCH.............................8
REMOVAL
IGNITION SWITCH REMOVAL.............9INSTALLATION
IGNITION SWITCH INSTALLATION.........9
KEY-IN IGNITION SWITCH
DESCRIPTION.........................10
DIAGNOSIS AND TESTING - KEY-IN IGNITION
SWITCH............................10
LOCK CYLINDER
REMOVAL.............................10
INSTALLATION.........................11
INTERMEDIATE SHAFT
REMOVAL.............................11
INSTALLATION.........................11
STEERING WHEEL
REMOVAL.............................12
INSTALLATION.........................12
COLUMN
DESCRIPTION
The standard non-tilt and tilt steering column has
been designed to be serviced as an assembly. The col-
umn is connected to the steering gear with a one
piece shaft. The upper half has a support bearing
mounted to a bracket. The bracket mounts to the
frame rail with two nuts. The shaft is serviceable.
The key cylinder, switches, clock spring, trim shrouds
and steering wheel are serviced separately.
OPERATION - SERVICE PRECAUTIONS
Safety goggles should be worn at all times when
working on steering columns.
To service the steering wheel, switches or airbag,
refer to Electrical - Restraints and follow all WARN-
INGS and CAUTIONS.
WARNING: THE AIRBAG SYSTEM IS A SENSITIVE,
COMPLEX ELECTRO-MECHANICAL UNIT. BEFORE
ATTEMPTING TO DIAGNOSE, REMOVE OR INSTALL
THE AIRBAG SYSTEM COMPONENTS YOU MUST
FIRST DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE. THEN WAIT TWOMINUTES FOR THE SYSTEM CAPACITOR TO DIS-
CHARGE. FAILURE TO DO SO COULD RESULT IN
ACCIDENTAL DEPLOYMENT OF THE AIRBAG AND
POSSIBLE PERSONAL INJURY. THE FASTENERS,
SCREWS, AND BOLTS, ORIGINALLY USED FOR
THE AIRBAG COMPONENTS, HAVE SPECIAL COAT-
INGS AND ARE SPECIFICALLY DESIGNED FOR THE
AIRBAG SYSTEM. THEY MUST NEVER BE
REPLACED WITH ANY SUBSTITUTES. ANYTIME A
NEW FASTENER IS NEEDED, REPLACE WITH THE
CORRECT FASTENERS PROVIDED IN THE SERVICE
PACKAGE OR FASTENERS LISTED IN THE PARTS
BOOKS.REMOVAL
(1) Position front wheelsstraight ahead.
(2) Remove and isolate the negative ground cable
from the battery.
(3) Remove the airbag, (Refer to 8 - ELECTRICAL/
RESTRAINTS/DRIVER AIRBAG - REMOVAL).
NOTE: If equipped with cruise control, disconnect
clock spring harness from the cruise switch har-
ness on the steering wheel.
KJCOLUMN 19 - 5

(4) Remove the steering wheel with an appropriate
puller (Fig. 1) (Refer to 19 - STEERING/COLUMN/
STEERING WHEEL - REMOVAL).
(5) Remove knee blocker cover and knee blocker,
(Refer to 23 - BODY/INSTRUMENT PANEL/KNEE
BLOCKER - REMOVAL). (Fig. 2)
(6) Remove screws from the lower column shroud
(Fig. 3) and remove both the upper and lower
shrouds.
(7) Turn ignition key to the on position.(8) If vehicle is equipped with automatic transmis-
sion, disconnect shifter interlock cable from the col-
umn.
(9) Remove the steering coupler bolt and column
mounting nuts and bolts (Fig. 4) then lower column
off the mounting studs.
(10) Disconnect and remove the wiring harness
from the column (Fig. 5).
(11) Slide the shifter interlock cable from the tie
straps.
(12) Remove column.
(13) Transfer the necessary parts if needed.
(14) Remove clock spring (Fig. 6), switches, (SKIM
if equipped) (Refer to 8 - ELECTRICAL/RE-
STRAINTS/CLOCKSPRING - REMOVAL).
Fig. 1 Steering Wheel Puller
1 - PULLER C-3894-A
2 - STEERING WHEEL
Fig. 2 KNEE BLOCKER
Fig. 3 SHROUD REMOVAL/INSTALL
1 - Upper Shroud
2 - Lower Shroud
Fig. 4 STEERING COLUMN MOUNTING
1 - Steering Column
2 - Mounting Holes
19 - 6 COLUMNKJ
COLUMN (Continued)

INSTALLATION
(1) Align and install column into the steering cou-
pler.(2) Install column harness and connect harness to
switches.
(3) Reroute the shifter interlock cable through the
tie straps.
(4) Install the column onto the mounting studs.
(5) Install the two mounting nuts and the two
mounting bolts all finger tight.
CAUTION: Lower nuts must be installed and tight-
ened first then the upper nuts in order to prevent
damage to the capsules.
(6) Tighten the lower mounting nuts to 17 N´m
(150 in. lbs.).
(7) Tighten the upper mounting nuts to 17 N´m
(150 in. lbs.).
(8) Install the steering column coupler bolt and
tighten to 49 N´m (36 ft. lbs.).
(9) Reconnect the shifter interlock cable.
(10) Center the clock spring (if necessary) and
install it on the column, (Refer to 8 - ELECTRICAL/
RESTRAINTS/CLOCKSPRING - INSTALLATION).
(11) Snap together the column shrouds and install
the mounting screws.
(12) Install the knee blocker and the knee blocker
cover, (Refer to 23 - BODY/INSTRUMENT PANEL/
KNEE BLOCKER - INSTALLATION).
(13)
NOTE: Do not reuse the old steering wheel bolt (a
new bolt must be used)
NOTE: Be certain that the steering wheel mounting
bolt is tightened to the proper torque specification
to ensure proper clockspring operation.Install the
steering wheel and tighten bolt to 54 N´m (40 ft.
lbs.) (Refer to 19 - STEERING/COLUMN/STEERING
WHEEL - INSTALLATION).
NOTE: If equipped with cruise control, connect
clock spring harness to cruise switch harness on
the steering wheel.
(14) Install the airbag, (Refer to 8 - ELECTRICAL/
RESTRAINTS/DRIVER AIRBAG - INSTALLATION).
(15) Install the negative battery terminal.
Fig. 5 WIRING HARNESS COLUMN
1 - Column Wiring Harness
2 - Multi-function Switch
3 - Ignition Switch
4 - Steering Column
Fig. 6 CLOCK SPRING
1 - Tilt Lever
2 - Ignition Switch
3 - Clockspring
4 - Steering Column
5 - SKIM
KJCOLUMN 19 - 7
COLUMN (Continued)

SPECIFICATIONS
TORQUE CHART
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Tilt Steering Column
Steering Wheel Bolt54 40 Ð
Tilt Steering Column
Mounting Bolts17 Ð 150
Tilt Steering Column
Coupler Bolt49 36 Ð
Non-Tilt Steering Column
Steering Wheel Bolt54 40 Ð
Non-Tilt Steering Column
Mounting Bolts17 Ð 150
Non-Tilt Steering Column
Coupler Bolt49 36 Ð
Ignition Switch Screws 2 Ð 17
SPECIAL TOOLS
STEERING COLUMN
IGNITION SWITCH
DESCRIPTION
The electrical ignition switch is located on the
steering column. It is used as the main on/off switch-
ing device for most electrical components. The
mechanical key lock cylinder is used to engage/disen-
gage the electrical ignition switch.
DIAGNOSIS AND TESTING - IGNITION SWITCH
ELECTRICAL DIAGNOSIS
For ignition switch electrical schematics, Refer to
the appropriate section for the component.
MECHANICAL DIAGNOSIS (KEY DIFFICULT TO
ROTATE)
Vehicles equipped with an automatic trans-
mission and a floor mounted shifter:a cable is
used to connect the interlock device in the steering
column assembly, to the transmission floor shift
lever. This interlock system is used to lock the trans-
mission shifter in the PARK position when the key
lock cylinder is rotated to the LOCKED or ACCES-
SORY position. If the ignition key is difficult to
rotate to or from the LOCK or ACCESSORY position,
it may not be the fault of the key cylinder or the
steering column components. The brake transmission
shift interlock cable may be out of adjustment. (Refer
to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- 30RH/GEAR SHIFT CABLE - ADJUSTMENTS).
The interlock system within the steering column is
not serviceable. If repair is necessary, the steering
column assembly must be replaced. (Refer to 19 -
STEERING/COLUMN - REMOVAL).
Vehicles equipped with a manual transmis-
sion and a floor mounted shifter:on certain mod-
els, a button is located on the steering column behind
the ignition key lock cylinder. The button must be
manually depressed to allow rotation of the ignition
key lock cylinder to the LOCK or ACCESSORY posi-
tion. If it is difficult to rotate the key to the LOCK or
ACCESSORY position, the lever mechanism may be
defective. This mechanism is not serviceable. If
repair is necessary, the steering column assembly
must be replaced.(Refer to 19 - STEERING/COL-
UMN - REMOVAL).
Puller C-3894-A
19 - 8 COLUMNKJ
COLUMN (Continued)

REMOVAL
IGNITION SWITCH REMOVAL
The ignition key must be in the key cylinder for
cylinder removal. The key cylinder must be removed
first before removing ignition switch.
(1) Remove lower steering column cover screws
and remove cover.
(2) Remove lock cylinder.(Refer to 19 - STEERING/
COLUMN/KEY/LOCK CYLINDER - REMOVAL).
(3) Remove the multi-function switch.
(4) Disconnect the electrical connector at the rear
of the ignition switch.
(5) Remove the ignition switch mounting screw
(Fig. 7). Use tamper proof torx bit to remove the
screw.
(6) Pull the ignition switch straight out to remove
from the locking tabs (Fig. 8)
INSTALLATION
IGNITION SWITCH INSTALLATION
The ignition key must be in the key cylinder for
cylinder installation. The key cylinder must be
aligned with the ignition switch for installation.
(1) Before installing ignition switch, rotate the slot
in the switch to the ON position (Fig. 9).
(2) Connect the electrical connector to rear of igni-
tion switch. Make sure that locking tab is fully
seated into wiring connector.
(3) Position the switch to the column and install
tamper proof screw. Tighten screw to 2 N´m (17 in.
lbs.).(4) Install the lock cylinder (Refer to 19 - STEER-
ING/COLUMN/KEY/LOCK CYLINDER - INSTALLA-
TION).
(5) Test the operation of the lock cylinder for
smooth rotating.
(6) Install the multi-function switch.
(7) Install steering column lower cover.
Fig. 7 IGNITION SWITCH MOUNTING SCREW
1 - Tamper Proof Torx Screw
2 - Ignition Switch
Fig. 8 IGNITION SWITCH TABS
1 - Ignition Switch
2 - Locking Tabs
Fig. 9 IGNITION SWITCH ON POSITION
1 - Ignition Switch
2 - Rotate to On Position
KJCOLUMN 19 - 9
IGNITION SWITCH (Continued)