2002 JEEP LIBERTY CRANK SHAFT

INSTALLATION
BALANCE SHAFT TIMING
BALANCE SHAFT INSTALLATION
Balance shaft and carrier assembly installation is
the reverse of the removal procedure.During instal-
lation crankshaft-to-balance shaft timing must
be established. Refer to Timing procedure in
this section.
(1) With balance shafts installed in carrier (Fig.
110) position carrier on crankcase and install four
attaching bolts and tighten to 54 N´m (40 ft. lbs.).
(2) Turn balance shafts until both shaft key ways
are up, parallel to vertical centerline of engine.
Install short hub drive gear on sprocket driven shaft
and long hub gear on gear driven shaft. After instal-
lation gear and balance shaft keyways must be up
with gear timing marks meshed as shown in (Fig.
111).
(3) Install gear cover and tighten double ended
stud/washer fastener to 12 N´m (105 in. lbs.).
(4) Align flat on balance shaft drive sprocket to the
flat on crankshaft (Fig. 112).
Fig. 107 Chain Cover, Guide and Tensioner
1 - STUD
2 - TENSIONER (ADJUSTER)
3 - GEAR COVER
4 - ADJUST SCREW
5 - PIVOT SCREW
6 - CHAIN COVER (CUTAWAY)
7 - GUIDE
Fig. 108 Drive Chain and Sprockets
1 - NICKEL PLATED LINK AND MARK
2 - GEAR/SPROCKET SCREWS
3 - NICKEL PLATED LINK AND DOT
Fig. 109 Gear Cover and Gears
1 - STUD (DOUBLE ENDED)
2 - DRIVE GEAR
3 - DRIVEN GEAR
4 - CARRIER DOWEL
5 - GEAR(S)
6 - GEAR COVER
KJENGINE9s-61
BALANCE SHAFT (Continued)

(5) Install balance shaft drive sprocket on crank-
shaft using Special Tool 6052 (Fig. 113).
(6) Turn crankshaft until number 1 cylinder is at
top dead center (TDC). The timing marks on the
chain sprocket should line up with the parting line
on the left side of number one main bearing cap.
(Fig. 114).
(7) Place chain over crankshaft sprocket so that
the plated link of the chain is over the number 1 cyl-
inder timing mark on the balance shaft crankshaft
sprocket (Fig. 114).(8) Place balance shaft sprocket into the timing
chain (Fig. 114) and align the timing mark on the
sprocket (dot) with the (lower) plated link on the
chain.
NOTE: The lower plated link is 8 links from the
upper link.
Fig. 110 Balance Shaft - Removal/Installation
1 - REAR COVER
2 - CARRIER
3 - BALANCE SHAFT
Fig. 111 Gear Timing
1 - KEY WAYS UP
2 - GEAR ALIGNMENT DOTS
Fig. 112 Balance Shaft Sprocket Alignment to
Crankshaft
1 - ALIGN FLATS
Fig. 113 Balance Shaft Drive
1 - SPROCKET
2 - SPECIAL TOOL 6052
9s - 62 ENGINEKJ
BALANCE SHAFT (Continued)

(9) With balance shaft keyways pointing up (12
o'clock) slide the balance shaft sprocket onto the nose
of the balance shaft. The balance shaft may have to
be pushed in slightly to allow for clearance.
NOTE: THE TIMING MARK ON THE SPROCKET, THE
(LOWER) NICKEL PLATED LINK, AND THE ARROW
ON THE SIDE OF THE GEAR COVER SHOULD LINE
UP WHEN THE BALANCE SHAFTS ARE TIMED
CORRECTLY.
(10) If the sprockets are timed correctly, install the
balance shaft bolts and tighten to 28 N´m (250 in.
lbs.). A wood block placed between crankcase and
crankshaft counterbalance will prevent crankshaft
and gear rotation.(11)CHAIN TENSIONING:
(a) Install chain tensioner loosely assembled.
(b) Position guide on double ended stud making
sure tab on the guide fits into slot on the gear
cover. Install and tighten nut/washer assembly to
12 N´m (105 in. lbs.).
(c) Place a shim 1 mm (0.039 in.) thick x 70 mm
(2.75 in.) long or between tensioner and chain.
Push tensioner and shim up against the chain.
Apply firm pressure 2.5±3 Kg (5.5±6.6 lbs.)
directly behind the adjustment slot to take up
all slack.Chain must have shoe radius contact as
shown in (Fig. 115).
(d) With the load applied, tighten top tensioner
bolt first, then bottom pivot bolt. Tighten bolts to
12 N´m (105 in. lbs.). Remove shim.
(e) Install carrier covers and tighten screws to
12 N´m (105 in. lbs.).
(12) Install pick-up tube and oil pan.
(13) Fill engine crankcase with proper oil to cor-
rect level.
Fig. 114 Balance Shaft Timing
1 - MARK ON SPROCKET
2 - KEYWAYS UP
3 - ALIGN MARKS
4 - PLATED LINK
5 - PARTING LINE (BEDPLATE TO BLOCK)
6 - PLATED LINK
Fig. 115 Chain Tension Adjustment
1 - 1MM (0.039 IN.) SHIM
2 - TENSIONER (ADJUSTER) BOLT
3 - PIVOT BOLT
KJENGINE9s-63
BALANCE SHAFT (Continued)

SPECIFICATIONS
FUEL SYSTEM PRESSURE
339 kPa +/- 34 kPa (49.2 psi +/- 2 psi).
TORQUE
DESCRIPTION N-m Ft. Lbs. In. Lbs.
Accelerator Pedal Bracket Mounting Nuts 12 - 105
Crankshaft Position Sensor - 2.4L 28 21 -
Crankshaft Position Sensor - 3.7L 28 21 -
Camshaft Position Sensor - 2.4L 12 - 106
Camshaft Position Sensor - 3.7L 12 - 106
Engine Coolant Temperature Sensor 11 - 96
EVAP Canister-to-Body Bolts 48 35 -
EVAP Canister-to-Canis. Bracket Bolt/Nut 11 - 100
Fuel Filler Hose Clamp at Tank 3 - 30
Fuel Filler Housing-to-Body Screws 2 - 17
Fuel Filter Mounting Nut at Tank 5.5 - 49
Fuel Pump Module Access Plate Nuts 3 - 26
Fuel Rail Mounting Bolts - 3.7L 11 - 100
Fuel Rail Mounting Bolts - 2.4L 28 - 250
Fuel Tank Heat Sheild Nuts 5.5 - 49
Fuel Tank Mounting Strap Bolts 61 45 -
Fuel Tank Skid Plate and Trailer Hitch 88 65 -
IAC Motor Mounting Screws 7 - 60
Leak Detection Pump Mounting Bracket-to-Fuel
Tank Nuts5.5 - 49
Leak Detection Pump-to-Bracket Nuts 1.2 - 11
Map Sensor Mounting Screws 3 - 25
PCM-to-Mounting Bracket Mounting Screws 4 - 35
Power Steering Pressure Switch 14-22 - 124-195
TPS Mounting Screws 7 - 60
Throttle Body Mounting Bolts 11 - 100
Oxygen Sensors 30 22 -
KJFUEL DELIVERY 14 - 5
FUEL DELIVERY (Continued)

FUEL INJECTION
TABLE OF CONTENTS
page page
FUEL INJECTION
DESCRIPTION.........................29
ACCELERATOR PEDAL
REMOVAL.............................29
INSTALLATION.........................30
CRANKSHAFT POSITION SENSOR
DESCRIPTION.........................30
OPERATION...........................31
REMOVAL.............................31
INSTALLATION.........................32
FUEL INJECTOR
DESCRIPTION.........................33
OPERATION
OPERATION - FUEL INJECTOR..........33
OPERATION - PCM OUTPUT............33
DIAGNOSIS AND TESTING - FUEL INJECTOR . 33
REMOVAL.............................34
INSTALLATION.........................34
FUEL PUMP RELAY
DESCRIPTION.........................34
OPERATION...........................34
DIAGNOSIS AND TESTING - FUEL PUMP
RELAY..............................34
REMOVAL.............................34
INSTALLATION.........................34
IDLE AIR CONTROL MOTOR
DESCRIPTION.........................35
OPERATION...........................35
REMOVAL.............................36INSTALLATION.........................36
INTAKE AIR TEMPERATURE SENSOR
DESCRIPTION.........................36
OPERATION...........................36
REMOVAL.............................37
INSTALLATION.........................38
MAP SENSOR
DESCRIPTION.........................38
OPERATION...........................38
REMOVAL.............................39
INSTALLATION.........................40
OXYGEN SENSOR
DESCRIPTION.........................40
OPERATION...........................40
REMOVAL.............................41
INSTALLATION.........................43
THROTTLE BODY
DESCRIPTION.........................43
OPERATION...........................43
REMOVAL.............................43
INSTALLATION.........................44
THROTTLE CONTROL CABLE
REMOVAL.............................45
INSTALLATION.........................46
THROTTLE POSITION SENSOR
DESCRIPTION.........................47
OPERATION...........................47
REMOVAL.............................47
INSTALLATION.........................48
FUEL INJECTION
DESCRIPTION
The Powertrain Control Module (PCM) operates
the fuel injection system. Refer to Powertrain Control
Module in Electronic Control Modules for informa-
tion.
ACCELERATOR PEDAL
REMOVAL
The accelerator pedal is serviced as a complete
assembly including the bracket.The accelerator pedal is connected to the upper
part of the accelerator pedal arm by a plastic
retainer (clip) (Fig. 1). This plastic retainer snaps
into the top of the accelerator pedal arm.
(1) From inside the vehicle, hold up accelerator
pedal. Remove plastic cable retainer (clip) and throt-
tle cable core wire from upper end of accelerator
pedal arm (Fig. 1). Plastic cable retainer (clip) snaps
into pedal arm.
(2) Remove 2 accelerator pedal mounting bracket
nuts. Remove accelerator pedal assembly.
KJFUEL INJECTION 14 - 29

INSTALLATION
(1) Place accelerator pedal assembly over 2 studs
(Fig. 1) protruding from floor pan.
(2) Install 2 mounting nuts. Refer to torque speci-
fications.
(3) Slide throttle cable into opening slot in top of
pedal arm.
(4) Push plastic cable retainer (clip) into accelera-
tor pedal arm opening until it snaps into place.
(5) Before starting engine, operate accelerator
pedal to check for any binding.
CRANKSHAFT POSITION
SENSOR
DESCRIPTION
2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block (Fig. 2).
It is positioned and bolted into a machined hole.
3.7L
The Crankshaft Position (CKP) sensor is mounted
into the right rear side of the cylinder block (Fig. 3).
It is positioned and bolted into a machined hole.
Fig. 1 ACCELERATOR PEDAL/BRACKET ASSEMBLY
1 - METAL THROTTLE CABLE CLIP
2 - THROTTLE CABLE
3 - PLASTIC CABLE RETAINER
4 - PEDAL/BRACKET ASSEMBLY
5 - PEDAL MOUNTING NUTS (2)
6 - PEDAL MOUNTING STUDS (2)
Fig. 2 CKP SENSOR LOCATION-2.4L
1 - RIGHT FRONT ENGINE MOUNT
2 - CKP SENSOR
3 - MOUNTING BOLT
4 - ELECTRICAL CONNECTOR
Fig. 3 CKP - 3.7L
1 - MOUNTING BOLT
2 - CKP SENSOR
3 - O-RING
14 - 30 FUEL INJECTIONKJ
ACCELERATOR PEDAL (Continued)

OPERATION
2.4L
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) sensor. The
sensor generates pulses that are the input sent to the
Powertrain Control Module (PCM). The PCM inter-
prets the sensor input to determine the crankshaft
position. The PCM then uses this position, along with
other inputs, to determine injector sequence and igni-
tion timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.
A tonewheel (targetwheel) is a part of the engine
crankshaft (Fig. 4). This tonewheel has sets of
notches at its outer edge.
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.
3.7L
Engine speed and crankshaft position are provided
through the CKP (Crankshaft Position) sensor. The
sensor generates pulses that are the input sent to the
Powertrain Control Module (PCM). The PCM inter-
prets the sensor input to determine the crankshaft
position. The PCM then uses this position, along with
other inputs, to determine injector sequence and igni-
tion timing.
The sensor is a hall effect device combined with an
internal magnet. It is also sensitive to steel within a
certain distance from it.A tonewheel (targetwheel) is bolted to the engine
crankshaft (Fig. 5). This tonewheel has sets of
notches at its outer edge (Fig. 5).
The notches cause a pulse to be generated when
they pass under the sensor. The pulses are the input
to the PCM.
REMOVAL
2.4L
The Crankshaft Position (CKP) sensor is mounted
into the right front side of the cylinder block (Fig. 6).
It is positioned and bolted into a machined hole.
(1) Disconnect sensor electrical connector.
(2) Remove sensor bolt.
(3) Carefully pry sensor from cylinder block in a
rocking action.
(4) Check condition of sensor o-ring (Fig. 7).
3.7L
The Crankshaft Position (CKP) sensor is mounted
into the right rear side of the cylinder block (Fig. 8).
It is positioned and bolted into a machined hole.
(1) Raise vehicle.
(2) Disconnect sensor electrical connector.
(3) Remove sensor mounting bolt (Fig. 8).
(4) Carefully remove sensor from cylinder block in
a rocking and twisting action.
(5) Check condition of sensor o-ring.
Fig. 4 CKP OPERATION-2.4L
1 - NOTCHES
2 - CRANKSHAFT
Fig. 5 CKP OPERATION-3.7L
1 - TONEWHEEL
2 - NOTCHES
3 - CRANKSHAFT POSITION SENSOR
4 - CRANKSHAFT
KJFUEL INJECTION 14 - 31
CRANKSHAFT POSITION SENSOR (Continued)

INSTALLATION
2.4L
(1) Clean out machined hole in engine block.
(2) Apply a small amount of engine oil to sensor
o-ring.(3) Install sensor into engine block with a slight
rocking action. Do not twist sensor into position as
damage to o-ring may result.
CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder
block. If sensor is not flush, damage to sensor
mounting tang may result.
(4) Install mounting bolt and tighten to 28 N´m
(21 ft. lbs.) torque.
(5) Connect electrical connector to sensor.
3.7L
(1) Clean out machined hole in engine block.
(2) Apply a small amount of engine oil to sensor
o-ring.
(3) Install sensor into engine block with a slight
rocking and twisting action.
CAUTION: Before tightening sensor mounting bolt,
be sure sensor is completely flush to cylinder
block. If sensor is not flush, damage to sensor
mounting tang may result.
(4) Install mounting bolt and tighten to 28 N´m
(21 ft. lbs.) torque.
(5) Connect electrical connector to sensor.
(6) Lower vehicle.
Fig. 6 CKP SENSOR LOCATION-2.4L
1 - RIGHT FRONT ENGINE MOUNT
2 - CKP SENSOR
3 - MOUNTING BOLT
4 - ELECTRICAL CONNECTOR
Fig. 7 CKP AND O-RING-2.4L
1 - CKP SENSOR
2 - O-RING
Fig. 8 CKP - 3.7L
1 - MOUNTING BOLT
2 - CKP SENSOR
3 - O-RING
14 - 32 FUEL INJECTIONKJ
CRANKSHAFT POSITION SENSOR (Continued)