2002 JEEP LIBERTY 2.4

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)

(13) Close valve fully three times and record high-
est pressure indicated each time.All three read-
ings must be above specifications and within
345 kPa (50 psi) of each other.
²Pressures above specifications but not within
345 kPa (50 psi) of each other, replace pump.
²Pressures within 345 kPa (50 psi) of each other
but below specifications, replace pump.
(14) Open the test valve and turn the steering
wheel to the extreme left and right positions three
times against the stops. Record the highest pressure
reading at each position. Compare readings to the
pump specifications chart. If pressures readings are
not within 50 psi of each other, the gear is leaking
internally and must be replaced.CAUTION: Do not force the pump to operate against
the stops for more than 2 to 3 seconds at a time
because, pump damage will result.
PUMP SPECIFICATION
ENGINERELIEF PRESSURE  
50FLOW RATE
(GPM) AT 1500
RPM
3.7L,
2.4L &
2.5L10342 kPa (1450 psi) 2.4 - 2.8
19 - 4 STEERINGKJ
STEERING (Continued)

PUMP
TABLE OF CONTENTS
page page
PUMP
DESCRIPTION.........................17
OPERATION...........................17
STANDARD PROCEDURE - POWER
STEERING PUMP - INITIAL OPERATION....18
REMOVAL
REMOVAL - 3.7L......................18
REMOVAL - 2.4L......................18
INSTALLATION
INSTALLATION - 3.7L..................19
INSTALLATION - 2.4L..................19
SPECIFICATIONS
TORQUE CHART......................19
SPECIAL TOOLS
POWER STEERING PUMP..............20
FLUID COOLER
DESCRIPTION.........................20
OPERATION...........................20
REMOVAL.............................20
INSTALLATION.........................20
HOSES
REMOVAL
REMOVAL - PRESSURE HOSE...........21
REMOVAL - RETURN HOSE (GEAR TO THE
COOLER)...........................21REMOVAL - RETURN HOSE (RESERVOIR
TO THE COOLER).....................21
INSTALLATION
INSTALLATION - PRESSURE HOSE.......21
INSTALLATION - RETURN HOSE (GEAR TO
THE COOLER)........................22
INSTALLATION - RETURN HOSE
(RESERVOIR TO THE COOLER)..........22
POWER STEERING PRESSURE SWITCH
DESCRIPTION.........................22
OPERATION...........................22
REMOVAL.............................22
INSTALLATION.........................22
PULLEY
REMOVAL.............................23
INSTALLATION.........................23
RESERVOIR
REMOVAL
REMOVAL - 3.7L......................24
REMOVAL - 2.4L......................24
INSTALLATION
INSTALLATION - 3.7L..................24
INSTALLATION - 2.4L..................24
PUMP
DESCRIPTION
Hydraulic pressure for the power steering system
is provided by a belt driven power steering pump
(Fig. 1). The pump shaft has a pressed-on high
strength plastic drive pulley that is belt driven by
the crankshaft pulley. The integral reservoir used on
the 3.7L only is attached to the pump body with
spring clips (Fig. 1). The 2.4L uses a remote fluid res-
ervoir (Fig. 2). The power steering pump is connected
to the steering gear by the pressure and return
hoses.
OPERATION
The power steering pump is a constant flow rate
and displacement, vane-type pump. The pump inter-
nal parts operate submerged in fluid. The flow con-
trol orifice is part of the high pressure line fitting.
The pressure relief valve inside the flow control valve
limits the pump pressure.Fig. 1 POWER STEERING PUMP ASSEMBLY
1 - RESERVOIR
2 - CAP
3 - PULLEY
4 - PUMP BODY
5 - RESERVOIR RETAINING CLIPS
KJPUMP 19 - 17

NOTE: Power steering pumps have different pres-
sure rates and are not interchangeable with other
pumps.
STANDARD PROCEDURE - POWER STEERING
PUMP - INITIAL OPERATION
WARNING: THE FLUID LEVEL SHOULD BE
CHECKED WITH ENGINE OFF TO PREVENT INJURY
FROM MOVING COMPONENTS.
CAUTION: Use MOPAR Power Steering Fluid or
equivalent. Do not use automatic transmission fluid
and do not overfill.
Wipe filler cap clean, then check the fluid level.
The dipstick should indicateCOLDwhen the fluid is
at normal ambient temperature.
(1) Fill the pump fluid reservoir to the proper level
and let the fluid settle for at least two minutes.
(2) Raise the front wheels off the ground.
(3) Slowly turn the steering wheel right and left,
lightly contacting the wheel stops at least 20 times.
(4) Check the fluid level add if necessary.
(5) Lower the vehicle, start the engine and turn
the steering wheel slowly from lock to lock.
(6) Stop the engine and check the fluid level and
refill as required.
CAUTION: Do not run a vehicle with foamy fluid for
an extended period. This may cause pump damage.
(7) If the fluid is extremely foamy or milky look-
ing, allow the vehicle to stand a few minutes and
repeat the procedure.
(8) Add fluid if necessary. Repeat the above proce-
dure until the fluid level remains constant after run-
ning the engine.
REMOVAL
REMOVAL - 3.7L
(1) Siphon out as much power steering fluid as
possible.
(2) Remove the radiator cross member (Refer to 23
- BODY/EXTERIOR/RADIATOR CROSSMEMBER -
REMOVAL).
(3) Remove the engine cooling fan (Refer to 7 -
COOLING/ENGINE/RADIATOR FAN - REMOVAL).
(4) Remove the fan shroud
(5) Remove the serpentine drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(6) Remove the power steering high pressure hose
at the pump.
(7) Remove the return hose at the pump.
(8) Remove the three bolts securing the pump to
the bracket thru the holes in the pulley. (Fig. 3)
(9) Remove the pump from the vehicle.
REMOVAL - 2.4L
CAUTION: On vehicles equipped with the 2.4L, Do
not reuse the old power steering pump pulley it is
not intended for reuse. A new pulley must be
installed if removed.
(1) Siphon out as much power steering fluid as
possible.
(2) Remove the serpentine drive belt.
(3) Remove the power steering high pressure hose
at the pump using care not to remove the flow con-
trol valve.
(4) Remove the return hose at the pump.
Fig. 2 FLUID RESERVOIR - 2.4L
Fig. 3 POWER STEERING PUMP - 3.7L
1 - MOUNTING BOLTS
2 - RESERVOIR
3 - STEEL PULLEY
19 - 18 PUMPKJ
PUMP (Continued)

(5) Remove the two nuts securing the wire loom
behind the pump bracket.
(6) Remove the three bolts securing the pump to
the bracket thru the holes in the pulley. (Fig. 4)
(7) Remove the pump from the vehicle.
INSTALLATION
INSTALLATION - 3.7L
(1) Install the pump to the vehicle.(2) Install the three bolts securing the pump to the
engine. (Fig. 3) Tighten the bolts to 47 N´m (35
ft.lbs.).
(3) Install the power steering hoses.
(4) Install the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
(5) Install the fan shroud
(6) Install the engine cooling fan (Refer to 7 -
COOLING/ENGINE/RADIATOR FAN - INSTALLA-
TION).
(7) Install the radiator crossmember (Refer to 23 -
BODY/EXTERIOR/RADIATOR CROSSMEMBER -
INSTALLATION).
(8) Refill the power steering fluid and check for
leaks (Refer to 19 - STEERING/PUMP - STANDARD
PROCEDURE).
INSTALLATION - 2.4L
(1) Install the pump to the vehicle.
(2) Install the three bolts securing the pump to the
engine. (Fig. 4) Tighten the bolts to 47 N´m (35
ft.lbs.).
(3) Install the two nuts securing the wire loom to
the pump bracket.
(4) Install the power steering pressure and supply
hoses.
(5) Install the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
(6) Refill the power steering fluid and check for
leaks (Refer to 19 - STEERING/PUMP - STANDARD
PROCEDURE).
SPECIFICATIONS
TORQUE CHART
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Power Steering Pump
Bracket to Pump28 21 Ð
Power Steering Pump
Bracket to Engine47 35 Ð
Power Steering Pump
Flow Control Valve75 55 Ð
Power Steering Pump
Pressure Line28 21 Ð
Power Steering Pump
Pressure Line Bracket12 9 105
Fig. 4 POWER STEERING PUMP - 2.4L
1 - MOUNTING BOLTS
2 - PULLEY
KJPUMP 19 - 19
PUMP (Continued)

(6) Install the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
(7) Install the fan shroud.
(8) Install the fan (Refer to 7 - COOLING/EN-
GINE/RADIATOR FAN - INSTALLATION).
(9) Install the radiator crossmember (Refer to 23 -
BODY/EXTERIOR/RADIATOR CROSSMEMBER -
INSTALLATION).
(10) Refill the power steering fluid (Refer to 19 -
STEERING/PUMP - STANDARD PROCEDURE).
INSTALLATION - RETURN HOSE (GEAR TO THE
COOLER)
(1) Install the return hose to the vehicle. (Fig. 7)
(2) Install the return hose mounting bracket bolts
to the front cradle.
(3) Install the return hose at the cooler.
(4) Install the return hose at the gear 28 N´m (21
ft.lbs.).
(5) Install the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
(6) Install the fan shroud.
(7) Install the fan (Refer to 7 - COOLING/EN-
GINE/RADIATOR FAN - INSTALLATION).
(8) Install the radiator crossmember (Refer to 23 -
BODY/EXTERIOR/RADIATOR CROSSMEMBER -
INSTALLATION).
(9) Refill the power steering fluid (Refer to 19 -
STEERING/PUMP - STANDARD PROCEDURE).
INSTALLATION - RETURN HOSE (RESERVOIR
TO THE COOLER)
(1) Install the return hose to the vehicle.
(2) Install the return hose to the pump reservoir.
(3) Install the return hose at the cooler.
(4) Refill the power steering fluid (Refer to 19 -
STEERING/PUMP - STANDARD PROCEDURE).
POWER STEERING PRESSURE
SWITCH
DESCRIPTION
A pressure sensing switch is used in the power
steering system. It is mounted on the high-pressure
steering hose. This switch will be used with both
2.4L and 3.7L engines.
OPERATION
The switch is used on both the 2.4L 4±cylinder and
3.7L V-6 engines.
The power steering pressure switch provides an
input to the Powertrain Control Module (PCM). This
input is provided during periods of high steering
pump load and low engine rpm; such as during park-
ing maneuvers. The PCM increases the idle speed
through the Idle Air Control (IAC) motor. This is
done to prevent the engine from stalling under the
increased load.
When steering pump pressure exceeds 3275 kPa  
690 kPa (475 psi   100 psi), the Normally Closed
(NC) switch will open and the PCM will increase the
engine idle speed. This will prevent the engine from
stalling.
When pump pressure drops to approximately 1379
kPa (200 psi), the switch circuit will re-close and
engine idle speed will return to its previous setting.
REMOVAL
The power steering pressure switch is installed in
the power steering high-pressure hose (Fig. 9).
(1) Remove the high pressure power steering
hose(Refer to 19 - STEERING/PUMP/HOSES -
REMOVAL).
(2) Disconnect electrical connector from power
steering pressure switch.
(3) Place a small container or shop towel beneath
switch to collect any excess fluid.
(4) Remove switch. Use back-up wrench on power
steering line to prevent line bending.
INSTALLATION
(1) Install power steering switch into power steer-
ing line. (Fig. 9)
(2) Tighten to 9.6 N´m (85 in. lbs.) torque.
Fig. 8 HIGH PRESSURE HOSE ASSEMBLY
1 - HIGH PRESSURE POWER STEERING HOSE
2 - MOUNTING BRACKET
3 - POWER STEERING PRESURE SWITCH
19 - 22 PUMPKJ
HOSES (Continued)

(3) Install the high pressure power steering hose
(Refer to 19 - STEERING/PUMP/HOSES - INSTAL-
LATION).
(4) Connect electrical connector to switch.
(5) Check power steering fluid and add as neces-
sary (Refer to 19 - STEERING/PUMP - STANDARD
PROCEDURE).
(6) Start engine and again check power steering
fluid. Add fluid if necessary.
PULLEY
REMOVAL
CAUTION: On vehicles equipped with the 2.4L, Do
not reuse the old power steering pump pulley it is
not intended for reuse. A new pulley must be
installed if removed.
(1) Remove pump assembly. (Refer to 19 - STEER-
ING/PUMP - REMOVAL).
(2) Remove pulley from pump with Puller C-4333
or equivalent puller (Fig. 10).
INSTALLATION
NOTE: The pulley is marked front for installation.
(1) Replace pulley if bent, cracked, or loose.
(2) Install pulley on pump with Installer C-4063-B
or equivalent installer (Fig. 11). The pulley must be
flush with the end of the shaft. Ensure the tool and
pulley are aligned with the pump shaft.
(3) Install pump assembly. (Refer to 19 - STEER-
ING/PUMP - INSTALLATION)(4) With Serpentine Belt, run engine until warm (5
min.) and note any belt chirp. If chirp exists, move
pulley outward approximately 0.5 mm (0.020 in.). If
noise increases, press on 1.0 mm (0.040 in.).Be
careful that pulley does not contact mounting
bolts.
Fig. 9 POWER STEERING PRESSURE SWITCH
1 - HIGH PRESSURE POWER STEERING HOSE
2 - O-RING
3 - POWER STEERING PRESSURE SWITCH
Fig. 10 Pulley Removal
1 - POWER STEERING PUMP DRIVE PULLEY
2 - SPECIAL TOOL C-4333
Fig. 11 Pulley Installation
1 - POWER STEERING PUMP DRIVE PULLEY
2 - SPECIAL TOOL C-4063±B
KJPUMP 19 - 23
POWER STEERING PRESSURE SWITCH (Continued)

RESERVOIR
REMOVAL
REMOVAL - 3.7L
(1) Remove the power steering pump. (Refer to 19
- STEERING/PUMP - REMOVAL).
(2) Secure the pump in a holding fixture.
(3) Remove the retaining clips by prying the lock
tab upwards and tap the retaining clips off the pump
body. (Fig. 12)
(4) Remove the reservoir from the pump body.
REMOVAL - 2.4L
(1) Siphon out as much power steering fluid as
possible.
(2) Remove the power steering hoses.(3) Remove the bolt securing the reservoir to the
mounting bracket. (Fig. 13)
(4) Remove the reservoir.
INSTALLATION
INSTALLATION - 3.7L
(1) Install the reservoir to the pump body.
(2) Install the retaining clips to the pump and res-
ervoir.
(3) Install the pump to the engine. (Refer to 19 -
STEERING/PUMP - INSTALLATION).
(4) Refill the power steering fluid and check for
leaks (Refer to 19 - STEERING/PUMP - STANDARD
PROCEDURE).
INSTALLATION - 2.4L
(1) Install the reservoir to the mounting bracket.
(2) Install and tighten the bolt to
(3) Install the hoses.
(4) Refill the power steering fluid and check for
leaks (Refer to 19 - STEERING/PUMP - STANDARD
PROCEDURE). (Fig. 13)
Fig. 12 FLUID RESERVOIR
1 - FLUID RESERVOIR
2 - RETAINING CLIP
3 - PULLEY
4 - PUMP BODY
Fig. 13 FLUID RESERVOIR - 2.4L
19 - 24 PUMPKJ