1994 JEEP CHEROKEE ignition

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

REMOVAL
(1) Disconnect the electrical connector from the
sensor.
(2) Remove the sensor from the intake manifold.
INSTALLATION
(1) Install the sensor into the intake manifold.
Tighten the sensor to 28 Nzm (20 ft. lbs.) torque.
(2) Connect the electrical connector to the sensor.
CRANKSHAFT POSITION SENSOR
For description, operation and removal/installation
procedures, refer to Group 8D, Ignition Systems in
this manual.
ENGINE COOLANT TEMPERATURE SENSOR
The coolant temperature sensor is installed in the
thermostat housing (Fig. 5).
REMOVAL
(1) Drain cooling system until the coolant level is
below the cylinder head. Observe theWARNINGSin
Group 7, Cooling.(2) Disconnect the coolant temperature sensor wire
connector.
(3) Remove the sensor from the thermostat hous-
ing (Fig. 5).
INSTALLATION
(1) Install coolant temperature sensor into the cyl-
inder block. Tighten to 28 Nzm (21 ft. lbs.) torque.
(2) Connect the wire connector.
(3) Fill the cooling system. Refer to Group 7, Cool-
ing System.
FUEL FILTER
Refer to the Fuel Delivery System section of this
group for removal/installation procedures.
FUEL INJECTOR
REMOVAL
(1) Remove the fuel rail. Refer to Fuel Rail Re-
moval in this section.
(2) Remove the clip(s) that retain the fuel injec-
tor(s) to the fuel rail (Fig. 6).
Fig. 3 Sensor LocationÐ2.5L Engine
Fig. 4 Sensor LocationÐ4.0L Engine
Fig. 5 Engine Coolant Temperature SensorÐTypical
Fig. 6 Injector Retaining Clips
JFUEL SYSTEM 14 - 55

REMOVAL
(1) Disconnect the electrical connector from the
IAC motor.
(2) Remove IAC motor torx head mounting bolts.
(3) Remove IAC motor.
INSTALLATION
(1) Install IAC motor into throttle body and
tighten retaining bolts.
(2) Connect electrical connector to IAC motor.
IGNITION COIL
Refer to Group 8D, Ignition Systems for removal/
installation procedures.
INTAKE MANIFOLD
Refer to Group 11, Exhaust System and Intake
Manifold for removal/installation procedures.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
The MAP sensor is located on the dash panel near
the rear of the engine cylinder head (valve) cover
(Fig. 9).
REMOVAL
(1) Disconnect the MAP sensor electrical connector
(Fig. 9).
(2) Disconnect the MAP sensor vacuum supply
hose (Fig. 9).
(3) Remove the MAP sensor mounting bolts and
remove MAP sensor.
INSTALLATION
(1) Install MAP sensor to dash panel and secure
with mounting bolts.
(2) Install the MAP sensor vacuum supply hose.
(3) Connect the MAP sensor electrical connector.
OXYGEN (O2S) SENSOR
The O2S sensor is installed in the exhaust down
pipe just below the exhaust manifold flange (Fig. 10).
REMOVAL
WARNING: THE EXHAUST MANIFOLD BECOMES
VERY HOT DURING ENGINE OPERATION. ALLOW
ENGINE TO COOL BEFORE REMOVING OXYGEN
SENSOR.
(1) Raise and support the vehicle.
(2) Separate the electrical connectors.
(3) Remove the O2S sensor from the exhaust man-
ifold. Snap-On oxygen sensor wrench (number YA
8875) may be used for removal and installation.
INSTALLATION
Threads of new factory oxygen sensors are coated
with anti-seize compound to aid in removal.
(1) Install the O2S sensor into the exhaust mani-
fold and tighten to 30 Nzm (22 ft. lbs.) torque.
(2) Connect the O2S sensor wire connector to the
main harness.
Fig. 8 Idle Air Control
MotorÐRemoval/InstallationÐTypical
Fig. 9 MAP SensorÐTypical
Fig. 10 Oxygen SensorÐTypical
JFUEL SYSTEM 14 - 57

pump. The power steering pump is a constant flow
rate and displacement, vane-type pump. The internal
parts in the housing operate submerged in fluid. The
flow control orifice is part of the high pressure line
fitting. The pressure relief valve inside the flow con-
trol valve limits the pump pressure.
Power steering pumps have different pres-
sure rates and are not interchangeable with
other pumps.
The power steering pump is connected to the steer-
ing gear via high pressure and return hose. The
pump shaft has a pressed-on drive pulley that is belt
driven by the crankshaft pulley (Fig. 3).
XJ vehicles with 2.5L engines and all YJ vehicles:
The reservoir is mounted at the front left side of the
engine compartment. XJ vehicles equipped with a
4.0L engine have the reservoir attached to the pump
body with spring clips.
STEERING COLUMNS
Two general types of steering columns are installed
on Jeep vehicles: a fixed, non-tilt column and a tilt
column (Fig. 4).
The ignition key/lock cylinder is located in the
steering column. When the key/lock cylinder is
turned to the LOCK position, the ignition switch and
steering shaft cannot be operated. For vehicles with
an automatic transmission, the lock mechanism also
prevents operation of the gear shift mechanism.The center, slip-type intermediate shaft is attached
to the steering gear and steering column shaft with
universal joints.
Both types of steering columns have anti-theft pro-
visions. They are energy-absorbing.
Fig. 3 TC Series Pump With Integral Reservoir
Fig. 4 Steering Columns
Fig. 2 Ratio Code Location
19 - 2 STEERINGJ

(3) Remove the steering column mounting bracket
to instrument panel nuts. Lower the steering column.
Refer to Steering Column Removal .
(4) Disconnect the park-lock cable from the steer-
ing column and bracket.
(5) Remove the center console and related trim.
(6) Pull the carpet backward to expose the cable at
the gear selector lever bell-crank (Fig. 3).
(7) Disconnect the cable eyelet from the bell-crank
(Fig. 3).
(8) Remove the cable from the shift bracket (Fig.
3).
INSTALLATION
(1) Route and install the cable.
(2) Position the carpet and install the retaining
screws, the accelerator pedal bracket, the panels and
the moldings.
(3) Install the center console and related trim.
(4) Raise the steering column, refer to Steering
Column Removal.
(5) Install the lower portion of the instrument
panel, refer to Group 8E, Instrument Panel.
(6) Connect the battery negative cable.
ADJUSTMENT
(1) Pry up the park-lock cable adjuster lock (Fig.
3).
(2) Connect the park-lock cable eyelet to the bell-
crank pin (Fig. 3).
(3) Place the gear selector in park.
(4) Insert a .030 - .035 pin between the pawl and
the park gate (Fig. 4).
(5) Push the spring-loaded cable adjuster forward.(6) Lower the cable into the mounting bracket un-
til the tabs are fully engaged in the adjuster (Fig. 3).
(7) Push the cable adjuster lock clamp downward
to lock it (Fig. 3).
(8) Remove the pin from the park gate.
(9) Test the park-lock cable operation:
²Turn the ignition switch key to the LOCK position
²Press inward on the gear selector handle release
button, the button should not move
²Turn the ignition switch key to the ON position
²Press inward on the gear selector handle release
button
²Move the gear selector handle to the DRIVE or
NEUTRAL position
²Attempt to turn the ignition switch key to the
LOCK position
²If the park-lock cable is correctly adjusted, the key
will not turn to the LOCK position;
²Press inward on the gear selector handle release
button
²Move the gear selector handle to the PARK posi-
tion
²Turn the ignition switch key to the LOCK position
²If the park-lock cable is correctly adjusted, the key
will turn to the LOCK position.
(10) If additional cable adjustment is needed, slide
the adjuster forward or rearward to obtain the cor-
rect position (Fig. 3).
Refer to Group 21, Transmission for additional in-
formation.COLUMN REPLACEMENTÐXJ
REMOVAL
CAUTION: Bumping, jolting and hammering on the
steering column shaft and gear shift tube must be
avoided during all service procedures.
Fig. 3 Park-Lock Cable
Fig. 4 Park-Lock Adjustment
19 - 46 STEERINGJ

(11) Disconnect the following items from the steer-
ing column connectors:
²Ignition switch wire harness
²Dimmer switch wire harness
²Turn signal switch wire harness
²Windshield wiper wire harness
²Cruise control wire harness (if equipped)
²Park-lock cable (if equipped)
(12) Remove the bolts that attach the toe plate to
the floor pan (Fig. 9).
(13) Carefully remove column from vehicle.
INSTALLATION
CAUTION: Bumping, jolting and hammering on the
steering column shaft and gear shift tube must be
avoided during all service procedures.
(1) Carefully position column in vehicle.
(2) Align the column shaft to steering gear cou-
pling. Install and tighten the bolt to 34 Nzm (25 ft.
lbs.) torque.
(3) As applicable, connect the following items to
the steering column connectors:
²Ignition switch wire harness
²Dimmer switch wire harness
²Turn signal switch wire harness
²Windshield wiper wire harness
²Cruise control wire harness (if equipped)
²Park-lock cable (if equipped)
(4) Install the support bracket on the column and
tighten the bolts to 20 Nzm (180 in. lbs.) torque.
(5) Raise the column up to the brake sled studs.
Connect the brace to the column stud.
(6) Install and tighten the column to brake sled
nuts to 30 Nzm (22 ft. lbs.) torque.
(7) Column shift vehicles, install the shift cable
grommet on the shift lever.
(8) Install and tighten the toe plate-to-floor pan
bolts to 8 Nzm (66 in. lbs.) torque.(9) Column shift vehicles, install the shift indicator
cable on the shift housing. Check operation.
(10) Install the lower portion of the instrument
panel, refer to Group 8E, Instrument Panel.
(11) Install steering wheel on column, refer to
Steering Wheel-Installation.
(12) Connect the negative (ground) cable to the
battery.
COLUMN REPLACEMENTÐYJ
REMOVAL
CAUTION: Bumping, jolting and hammering on the
steering column shaft and gear shift tube must be
avoided during all service procedures.
(1) Make sure the front wheels are in thestraight
aheadposition.
(2) Disconnect the negative (ground) cable from the
battery.
(3) Remove steering wheel from column, refer to
Steering Wheel-Removal.
(4) Column shift vehicles, disconnect the shift ca-
ble grommet by prying it from the shift lever.
(5) Disconnect the column shaft to steering gear
coupler upper bolt (Fig. 10).
(6) Remove the lower portion of the instrument
panel, refer to Group 8E, Instrument Panel.
(7) Remove two nuts holding steering column
bracket to brake sled (Fig. 11).
(8) Remove four bolts holding steering column
bracket to column.
(9) Disconnect the following items from the steer-
ing column connectors:
²Ignition switch wire harness
²Dimmer switch wire harness
²Turn signal switch wire harness
²Windshield wiper wire harness
²Cruise control wire harness (if equipped)
Fig. 9 Steering Column Mounting
Fig. 10 Column Shaft Coupler
19 - 48 STEERINGJ

(10) Remove the bolts that attach the toe plate to
the floor pan (Fig. 12).
(11) Carefully remove column from vehicle.
INSTALLATION
CAUTION: Bumping, jolting and hammering on the
steering column shaft and gear shift tube must be
avoided during all service procedures.
(1) Carefully position column in vehicle.
(2) Align the column shaft to steering gear cou-
pling. Install and tighten the bolt to 34 Nzm (25 ft.
lbs.) torque.
(3) As applicable, connect the following items to
the steering column connectors:
²Ignition switch wire harness
²Dimmer switch wire harness²Turn signal switch wire harness
²Windshield wiper wire harness
²Cruise control wire harness (if equipped)
(4) Install the support bracket on the column (Fig.
11) and tighten the bolts to 30 Nzm (270 in. lbs.)
torque.
(5) Install and tighten the column to brake sled
bolts (Fig. 11) to 30 Nzm (270 in. lbs.) torque.
(6) Column shift vehicles, install the shift cable
grommet on the shift lever.
(7) Install and tighten the toe plate to floor pan
bolts/nuts to 21.5 Nzm (192 in. lbs.) torque (Fig. 12).
(8) Install the lower portion of the instrument
panel, refer to Group 8E, Instrument Panel.
(9) Install steering wheel on column, refer to Steer-
ing Wheel-Installation.
(10) Connect the negative (ground) cable to the
battery.
Fig. 11 Column BracketFig. 12 Steering Column Mounting
JSTEERING 19 - 49

NON-TILT STEERING COLUMN
DISASSEMBLYÐCOLUMN OR CONSOLE SHIFT
Steering column removal from the vehicle is not
necessary for;
²Lockplate cover
²Lockplate
²Steering shaft retaining ring
²Canceling cam
²Turn signal switch
²Upper bearing preload spring
²Ignition key/lock cylinder service
The steering column must be removed from
the vehicle to service any other component.
(1) If the column is removed for service, fabricate a
support fixture to clamp it in a vise (Fig. 1).
(2) Remove the steering wheel. Refer to the re-
moval procedure.
(3) Remove the lockplate cover.
WARNING: THE LOCKPLATE RETAINS A VERY
STRONG, SPRING FORCE. DO NOT ATTEMPT TO
REMOVE THE STEERING SHAFT RETAINING SNAP
RING WITHOUT USING LOCKPLATE COMPRESSOR
C-4156 (J23653-B).
(4) Compress the lockplate with Compressor
C-4156 (J-23653-B) and release the steering shaft re-
taining snap ring (Fig. 2).
(5) Remove the lockplate compressor tool and the
retaining snap ring. Discard the snap ring.CAUTION: When the steering shaft retaining snap
ring is removed, the steering shaft is no longer re-
tained within the column.
(6) Remove the lockplate, canceling cam, upper
bearing preload spring, and the thrust washer from
the steering column/shaft (Fig. 3).
Fig. 2 Retaining Snap Ring Removal
Fig. 3 Steering Column Disassembly
Fig. 1 Steering Column Support Fixture
19 - 50 STEERINGJ