1994 JEEP CHEROKEE fuel tank removal

MULTI-PORT FUEL INJECTION (MFI)ÐCOMPONENT REMOVAL/INSTALLATION
INDEX
page page
Accelerator Pedal and Throttle Cable......... 54
Air Cleaner Housing...................... 54
Air Conditioning (A/C) Clutch Relay........... 54
Air Filter............................... 54
Automatic Shut Down (ASD) Relay........... 54
Brake Switch............................ 54
Camshaft Position Sensor.................. 54
Crankshaft Position Sensor................. 55
Engine Coolant Temperature Sensor.......... 55
Fuel Filter.............................. 55
Fuel Injector............................ 55
Fuel Pump Module....................... 56
Fuel Pump Relay........................ 56
Fuel Rail Assembly....................... 56
Fuel System Pressure Release Procedure...... 56
Fuel Tank Pressure Relief/Rollover Valve...... 56
Fuel Tanks............................. 56Fuel Tubes/Lines/Hoses and Clamps.......... 56
Idle Air Control (IAC) Motor................. 56
Ignition Coil............................. 57
Intake Air Temperature Sensor.............. 54
Intake Manifold.......................... 57
Manifold Absolute Pressure (MAP) Sensor..... 57
Oxygen (O2S) Sensor..................... 57
Park Neutral Switch....................... 58
Power Steering Pressure SwitchÐ2.5L
Engine Only........................... 58
Powertrain Control Module (PCM)............ 58
Quick-Connect Fittings..................... 59
Throttle Body............................ 59
Throttle Position Sensor (TPS).............. 59
Torque Converter Clutch Relay.............. 60
Vehicle Speed Sensor..................... 60
ACCELERATOR PEDAL AND THROTTLE CABLE
Refer to the Accelerator Pedal and Throttle Cable
section of this group for removal/installation proce-
dures.
AIR CONDITIONING (A/C) CLUTCH RELAY
The A/C clutch relay is located in the Power Dis-
tribution Center (PDC) (Figs. 1 or 2). For location of
this relay within the PDC, refer to label on PDC
cover.
AIR CLEANER HOUSING
Refer to Group 25, Emission Control System.
AIR FILTER
Refer to Group 25, Emission Control System.
AUTOMATIC SHUT DOWN (ASD) RELAY
The ASD relay is located in the Power Distribution
Center (Figs. 1 or 2) (PDC). For location of this relay
within the PDC, refer to label on PDC cover.
BRAKE SWITCH
Refer to Group 5, Brakes for removal/installation
procedures.
CAMSHAFT POSITION SENSOR
For removal/installation procedures, refer to Group
8D, Ignition System. See Camshaft Position Sensor.
INTAKE AIR TEMPERATURE SENSOR
The intake manifold air temperature sensor is in-
stalled into the intake manifold plenum (Figs. 3 or
4).
Fig. 1 PDCÐYJ Models
Fig. 2 PDCÐXJ Models
14 - 54 FUEL SYSTEMJ

INSTALLATION
(1) Install the fuel injector(s) into the fuel rail as-
sembly and install retaining clip(s).
(2) Install fuel rail. Refer to Fuel Rail Installation
in this section.
(3) Start engine and check for fuel leaks.
FUEL PUMP MODULE
Refer to the Fuel Delivery System section of this
group for removal/installation procedures.
FUEL PUMP RELAY
The Fuel Pump relay is located in the Power Dis-
tribution Center (PDC) (Figs. 1 or 2). For location of
this relay within the PDC, refer to label on PDC
cover.
FUEL RAIL ASSEMBLY
REMOVAL
WARNING: THE FUEL SYSTEM IS UNDER CON-
STANT FUEL PRESSURE (EVEN WITH THE ENGINE
OFF) OF APPROXIMATELY 131-269 KPA (19-39
PSI). THIS PRESSURE MUST BE RELEASED BE-
FORE SERVICING THE FUEL RAIL.
(1) Remove fuel tank filler tube cap.
(2) Disconnect the negative battery cable from bat-
tery.
(3) Perform the Fuel System Pressure Release Pro-
cedure as described in the Fuel Delivery System sec-
tion of this Group.
(4) Remove and numerically attach a tag (if fuel
injector is not already tagged), the injector harness
connectors. Do this at each injector (Fig. 7).
(5) Disconnect vacuum line from fuel pressure reg-
ulator (Fig. 7).
(6) Disconnect fuel supply line from fuel rail and
the fuel return line from fuel pressure regulator (Fig.7). Refer to Fuel Tubes/Lines/Hoses and Clamps, or
Quick-Connect Fittings. These can both be found in
the Fuel Delivery section of this group.
(7) Remove fuel rail mounting bolts.
On models with automatic transmissions, it may be
necessary to remove automatic transmission throttle
line pressure cable (and bracket). This will aid in fuel
rail assembly removal.
(8) Remove fuel rail by gently rocking until all the
fuel injectors are out of the intake manifold.
INSTALLATION
(1) Position tips of all fuel injectors into the corre-
sponding injector bore in the intake manifold. Seat
injectors into manifold.
(2) Tighten fuel rail mounting bolts to 27 Nzm (20
ft. lbs.) torque.
(3) Connect injector harness connectors to appro-
priate (tagged) injector.
(4) Connect both fuel lines to fuel rail.
(5) Connect vacuum supply line to fuel pressure
regulator.
(6) Install protective cap to pressure test port fit-
ting.
(7) Install fuel tank cap.
(8) Connect negative battery cable to battery.
(9) Start engine and check for fuel leaks.
FUEL SYSTEM PRESSURE RELEASE PROCEDURE
WARNING: THE FUEL SYSTEM IS UNDER A CON-
STANT PRESSURE (EVEN WITH THE ENGINE OFF)
OF APPROXIMATELY 100 KPA (14.5 PSI). BEFORE
SERVICING THE FUEL PUMP, FUEL LINES, FUEL
FILTER OR FUEL INJECTOR, THE FUEL SYSTEM
PRESSURE MUST BE RELEASED.
Refer to the Fuel Delivery System section of this
group. See Fuel Pressure Release procedure.
FUEL TANKS
Refer to the Fuel Tank section of this group for re-
moval/installation procedures.
FUEL TANK PRESSURE RELIEF/ROLLOVER VALVE
Refer to the Fuel Tank section of this group for re-
moval/installation procedures.
FUEL TUBES/LINES/HOSES AND CLAMPS
Refer to the Fuel Delivery System section of this
group for removal/installation procedures. Also refer
to Quick-Connect Fittings in the Fuel Delivery sec-
tion of this group.
IDLE AIR CONTROL (IAC) MOTOR
The IAC motor is mounted to the throttle body ad-
jacent to the throttle position sensor (Fig. 8).
Fig. 7 Fuel Injector HarnessÐTypical
14 - 56 FUEL SYSTEMJ

(3) Lower the vehicle.
PARK NEUTRAL SWITCH
Refer to Group 21, Transmissions for park neutral
switch service.
POWER STEERING PRESSURE SWITCHÐ2.5L
ENGINE ONLY
The power steering pressure switch is installed in
the power steering high pressure hose (Figs. 11 or
12).
REMOVAL
(1) Disconnect the electrical connector from the
power steering pressure switch.
(2) Place a small container or shop towel beneath
the switch to collect any excess fluid.
(3) Remove the switch.
INSTALLATION
(1) Install the power steering switch.
(2) Connect the electrical connector to the switch.(3) Check power steering fluid and add as neces-
sary.
(4) Start the engine and again check power steer-
ing fluid. Add fluid if necessary.
POWERTRAIN CONTROL MODULE (PCM)
On XJ models, the PCM is located in the engine
compartment next to the air cleaner (Fig. 13). On YJ
models, the PCM is located in the engine compart-
ment behind the windshield washer fluid reservoir
(Fig. 14).
REMOVAL
(1) Disconnect the negative battery cable at the
battery.
(2) YJ Models Only: Remove the windshield
washer fluid tank.
(3) Loosen the 60-Way connector mounting bolt
(Figs. 13 or 14).
(4) Remove the electrical connector by pulling
straight back.
(5) Remove the three PCM mounting bolts.
(6) Remove PCM.
Fig. 11 Power Steering Pressure SwitchÐYJ Models
Fig. 12 Power Steering Pressure SwitchÐXJ Models
Fig. 13 PCM LocationÐXJ Models
Fig. 14 PCM LocationÐYJ Models
14 - 58 FUEL SYSTEMJ

INSTALLATION
(1) After the PCM electrical connector has been
separated from the PCM, inspect the pins for corro-
sion, being spread apart, bent or misaligned. Also in-
spect the pin heights in the connector. If the pin
heights are different, this would indicate a pin has
separated from the connector. Repair as necessary.
(2) Install PCM. Tighten three mounting bolts to 1
Nzm (9 in. lbs.) torque.
(3) Engage 60-way connector into PCM. Tighten
connector mounting bolt to 4 Nzm (35 in. lbs.) torque.
(4) YJ Models: Install windshield washer fluid
tank.
(5) Connect negative cable to battery.
QUICK-CONNECT FITTINGS
Refer to the Fuel Delivery System section of this
group for removal/installation procedures.
THROTTLE BODY
REMOVAL
(1) Disconnect the negative battery cable.
(2) Disconnect air cleaner hose from throttle body.
(3) Disconnect idle air control motor and throttle
position sensor wire connectors.
(4) Disconnect accelerator cable, throttle cable (au-
tomatic transmission) and speed control cable (if
equipped) from throttle arm (Fig. 15).
(5) Remove throttle body mounting bolts, throttle
body and gasket. Discard old gasket (Fig. 16).
INSTALLATION
(1) Install throttle body and new gasket. Tighten
throttle body mounting bolts to 12 Nzm (9 ft. lbs.)
torque.
(2) Connect idle air control motor and throttle po-
sition sensor wire connectors.
(3) Connect throttle linkage to throttle arm.CAUTION: When the automatic transmission throttle
cable is connected, it MUST be adjusted.
(4) If equipped with an automatic transmission,
connect and adjust the transmission line pressure ca-
ble. Refer to Group 21, Transmissions for adjustment
procedure.
(5) Install air cleaner hose to throttle body.
(6) Connect negative battery cable to battery.
THROTTLE POSITION SENSOR (TPS)
The TPS is mounted to the throttle body (Figs. 17
or 18).
REMOVAL
(1) Disconnect TPS electrical connector.
(2) Remove TPS mounting bolts.
(3) Remove TPS.
INSTALLATION
The throttle shaft end of the throttle body slides
into a socket in the TPS (Fig. 19). The TPS must be
installed so that it can be rotated a few degrees. (If
Fig. 16 Throttle
BodyÐRemoval/InstallationÐTypical
Fig. 17 TPS LocationÐ2.5L Engine
Fig. 15 Cables at Throttle Body
JFUEL SYSTEM 14 - 59

UNDERBODY COMPONENTS
INDEX
page page
Catalytic Converter/Muffler/Tailpipe Support
Brackets............................. 85
Front Skid Plate......................... 84
Fuel and Brake Fluid Tube Retainer Clip....... 86
Fuel Filler Hose Splash ShieldÐXJ Vehicles.... 86
Fuel Filter Bracket........................ 86Fuel Tank Skid Plate...................... 84
Fuel Tank Support Strap................... 86
Rear Tow HookÐXJ Vehicles............... 87
Service Information....................... 84
Trailer Hitches........................... 88
Transfer Case Skid Plate.................. 84
SERVICE INFORMATION
In some cases, components in the following proce-
dures either support, or are concealed by other com-
ponents. When necessary, refer to component
removal procedure for service access.
FRONT SKID PLATE
REMOVAL
(1) Remove the screws that attach skid plate to
side sills (Fig. 1).
(2) Remove the nuts that attach the skid plate to
the crossmember (Fig. 1).
(3) Remove the skid plate from the vehicle (Fig. 1).
INSTALLATION
(1) Position the skid plate at front crossmember
and side sills (Fig. 1).
(2) Install the nuts to attach the skid plate to
crossmember.(3) Install the screws to attach skid plate to side
sills.
TRANSFER CASE SKID PLATE
REMOVAL
(1) Support the skid plate.
(2) Remove the bolts that attach the skid plate to
the transmission support crossmember and frame sill
(Fig. 2).
(3) Remove the support and skid plate from the ve-
hicle.
INSTALLATION
(1) Position and support the skid plate at the
frame sill and transmission support crossmember
(Fig. 2).
(2) Attach the skid plate to the frame sill and
crossmember with bolts. Tighten bolts to 22 Nzm (16
ft-lbs) torque.
FUEL TANK SKID PLATE
REMOVALÐXJ VEHICLES
(1) Position a support under skid plate.
(2) Remove the bolts that attach skid plate to un-
derbody side rails (Figs. 3 and 4).
Fig. 1 Front Skid Plate Removal/Installation
Fig. 2 Transfer Case Skid Plate
23 - 84 BODY COMPONENTSÐXJ VEHICLESJ

(3) Remove the support and the skid plate from
the vehicle.
INSTALLATIONÐXJ VEHICLES
(1) Position and support skid plate under fuel
tank.
(2) Install bolts to attach the skid plate to under-
body rails. Tighten the bolts to 50 Nzm (37 ft-lbs)
torque.
(3) Remove the support from under skid plate.
CATALYTIC CONVERTER/MUFFLER/TAILPIPE
SUPPORT BRACKETS
REMOVAL
(1) As applicable, detach the catalytic converter,
muffler or tailpipe support bracket from insulator.
Remove the insulator from bracket.
(1) As applicable, install nuts and bolts, or screws
that attach bracket to frame. Tighten nuts/screws to
21 Nzm (16 ft-lbs) torque.(2) Install insulator on support bracket.
Fig. 1 Catalytic Converter Support Bracket
Fig. 2 Muffler/Tailpipe Support BracketÐXJ Vehicles
Fig. 3 Tailpipe Support BracketÐXJ Vehicles
Fig. 3 Fuel Tank Skid Plate W/O Trailer Hitch Or Tow
Hook
Fig. 4 Fuel Tank Skid Plate With Trailer Hitch Or
Tow Hook
JBODY COMPONENTSÐXJ VEHICLES 23 - 85

(3) Attach catalytic converter, muffler or tailpipe
insulator to support hanger to insulator.
FUEL AND BRAKE FLUID TUBE RETAINER CLIP
REMOVAL
(1) Remove the fuel/brake fluid tubes from clip
grooves.
(2) As applicable, pry serrated clip outward and re-
move it from frame rail hole, or remove stand-off
bracket screw.
INSTALLATION
(1) Position clip at the frame/panel hole.
(2) As applicable, force serrated clip inward and
seat it against the frame/panel, or install the stand-
off bracket screw.
(3) Insert fuel/brake fluid tubes in clip grooves and
press inward to seat them.
FUEL FILTER BRACKET
REMOVAL
(1) Remove screws that attach fuel filter bracket to
frame rail.
(2) Remove the screw from fuel filter bracket
clamp.
(3) Remove the clamp and fuel filter from bracket.
(4) Remove the bracket from filter.
INSTALLATION
(1) Position fuel filter bracket on filter.
(2) Position clamp on bracket and install screw.
Tighten screw to 8 Nzm (74 in-lbs) torque.(3) Position fuel filter bracket on frame rail.
(4) Install the screws that attach bracket to frame
rail. Tighten screws to 42 Nzm (31 ft-lbs) torque.
FUEL FILLER HOSE SPLASH SHIELDÐXJ
VEHICLES
REMOVAL
(1) Remove the screws that attach fuel filler hose
splash shield to wheelhouse panel and frame rail.
(2) Remove the hose splash shield from wheelhouse
panel and frame rail (Fig. 7).
INSTALLATION
(1) Position fuel filler hose splash shield at wheel-
house panel and frame rail.
(2) Install screws to attach splash shield to wheel-
house panel and frame rail.
FUEL TANK SUPPORT STRAP
SERVICE INFORMATION
XJ fuel tank support straps are attached to the un-
Fig. 4 Fuel and Brake Tube Serrated/Bracket-Type
Retainer ClipsÐXJ Vehicles
Fig. 5 Fuel Filter Bracket Removal/Installation
Fig. 6 Fuel Filter Bracket Clamp
Removal/Installation
23 - 86 BODY COMPONENTSÐXJ VEHICLESJ

derside of the vehicle via T-slots and hole-slots in the
frame members.
REMOVAL
(1) If equipped, position a support under skid plate.
(2) If equipped, remove the bolts that attach skid
plate to underbody side rails.
(3) If applicable, remove the support and skid plate
from fuel tank.
(4) Support fuel tank.
(5) Loosen nut from fuel tank support strap bolt to
allow bolt head to be removed from hole-slot in frame
member.
(6) Remove the strap T-end from frame member
T-slot.
(7) Separate support strap from fuel tank and re-
move it from vehicle.
INSTALLATION
(1) Position support strap around fuel tank.
(2) Insert strap T-end in frame member T-slot.(3) Insert bolt in hole-slot in frame member.
Tighten nut on the bolt until bolt-head and T-end are
seat and strap is tight against the bottom of fuel
tank.
(4) Remove the support from the fuel tank.
(5) If removed, position and support and the fuel
tank skid plate under the fuel tank.
(6) If applicable, install the bolts that attach the
skid plate to the underbody side rails. Tighten the
bolts to 50 Nzm (37 ft-lbs) torque.
(7) Remove the support from under the skid plate.
REAR TOW HOOKÐXJ VEHICLES
REMOVAL
(1) Remove the bolts that attach tow hook bracket
to the frame rail and reinforcement bracket.
Fig. 7 Fuel Filler Hose Splash ShieldÐXJ Vehicles
Fig. 8 Fuel Tank Support StrapÐXJ Vehicles
Fig. 9 Fuel Tank Support StrapsÐXJ Vehicles
Fig. 10 Rear Tow HookÐXJ Vehicles
JBODY COMPONENTSÐXJ VEHICLES 23 - 87