1988 JEEP CHEROKEE Service Repair Manual

** Draw @ 12 Volts Amp Output
Standard ......... (1) 4.0-5.0 Amps ................. 56
Optional ......... ( 1) 4.0-5.0 Amps ................. 66
Optional ......... ( 1) 4.0-5.0 Amps ................. 78
( 1) - At 80
F (27C).








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ALTERNATOR REGULATORS
All models use Delco-Remy solid state regulators, integral
with alternator. Regulator is nonadjustable.
BELT ADJUSTMENT
BELT ADJUSTMENT TABLE TENSION IN LBS. (KG) USING STRAND TENSION GAUGE








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Application New Belts Used Belts
"V"-Belts ......... 125-155 (57-70) ............... 90-115 (41-52\
)
Serpentine ........ 180-200 (82-91) .............. 140-160 (63-72\
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REPLACEMENT INTERVALS
REPLACEMENT INTERVALS TABLE








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Component Interval (Miles)
Air Filter ........................................ 30,000
Fuel Filter ....................................... 30,000
Oil & Filter ........................................ 7500
PCV Valve ......................................... 30,000
Spark Plugs ....................................... 30,000









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CAPACITIES
FLUID CAPACITIES TABLE








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Application Quantity
Auto. Trans. (Dexron II)
Wrangler ............................... 8.0 qts. (7.6L)
All Others ............................. 8.5 qts. (8.0L)
Cooling System
Wrangler .............................. 10.5 qts. (9.9L)
All Others ........................... 12.0 qts. (11.4L)
Crankcase (Includes Filter)
Wrangler ............................... 5.0 qts. (4.7L)
All Others ............................. 6.0 qts. (5.7L)
Drive Axle
Front .................................. 2.5 pts. (1.2L)
Rear
Comanche
Standard Capacity .................. 2.5 pts. (1.2L)
Metric Ton Axle .................... 4.8 pts. (2.3L)
All Others ........................... 2.5 pts. (1.2L)
Fuel Tank
Cherokee & Wagoneer
Standard ............................ 13.5 gals. (51L)

Optional .............................. 20 gals. (76L)
Comanche
Standard .............................. 16 gals. (60L)
Optional ............................ 23.5 gals. (89L)
Wrangler
Standard .............................. 15 gals. (57L)
Optional .............................. 20 gals. (75L)
Manual Transmission
AX4 .................................... 7.8 pts. (3.7L)
AX5 .................................... 7.4 pts. (3.5L)
BA 10/5 ................................ 3.5 pts. (1.6L)
Transfer Case (Dexron II)
Wrangler .............................. 3.25 pts. (1.5L)
All Others
Command Trac ......................... 2.2 pts. (1.0L)
Select Trac .......................... 3.0 pts. (1.4L)









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SYSTEM REFRIGERANT CAPACITIES TABLE








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Application Ozs.
All Models ............................................ 36









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TU RN S IG NALS & H AZA R D F LA SH ER S

1988 J e ep C hero ke e
1988 Turn Signal & Hazard Light Systems
JEEP
DESCRIPTION
Turn signals and hazard flashers systems use a common turn
signal/hazard light switch assembly mounted within upper steering
column housing.
FLASHER LOCATIONS
Hazard
Mounted on fuse block.
Turn Signal
Mounted on fuse block.
TROUBLE SHOOTING
NOTE: Following trouble shooting is only information available
from manufacturer.
Hazard Lights (Comanche, Cherokee & Wagoneer)
If lights do not come on with hazard switch turned on, check
hazard/stop light fuse by operating stop lights. If fuse is okay,
check turn signal flasher, turn signal/hazard switch, and related
wiring. If only one hazard light does not work, check bulb.
Turn Signals (Comanche, Cherokee & Wagoneer)
If all turn signals do not work, check turn/back-up light
fuse by operating back-up lights. If fuse is okay, check turn signal
flasher, turn signal/hazard switch, and related wiring. If only one
turn signal does not work, check bulb.
TESTING
NOTE: Following trouble shooting is only information available
from manufacturer.
Hazard Indicators (Wrangler)
1) Turn ignition and hazard warning switch "ON". Check for
pulsating voltage at Light Blue (left indicator) and Dark Blue (right\
indicator) wires. If voltage is present, go to next step. If voltage
is not present, replace turn signal switch.
2) Remove bulbs for turn signal indicators. Measure
resistance across bulb terminals. If resistance is zero ohms, replace
light bulb(s). If resistance readings are not zero ohms, go to next
step.
3) Check for pulsating voltage at battery side of bulb
sockets. If voltage is present, go to next step. If voltage is not
present, repair open circuit between socket and turn signal switch
steering column connector.
4) Turn ignition off and check resistance on ground side of
bulb sockets. If resistance is zero ohms, hazard indicator circuit is
okay. If resistance reading is not zero ohms, repair open in ground
circuit.
Hazard Lights (Wrangler)

1) Check operation of stop lights. If stop lights come on, go
to next step. If not, check hazard/stop light fuse. If fuse is okay,
check for voltage on battery side of hazard/stop light fuse. If
voltage is not present, repair open circuit between fusible link and
fuse block.
2) Remove hazard flasher and check for voltage on battery
side of hazard flasher at fuse block. If voltage is present, go to
next step. If voltage is not present, repair open circuit to fuse
block.
3) Measure resistance across turn signal flasher terminals.
If resistance across flasher is zero ohms, replace flasher. If
resistance is other than zero ohms, install flasher and turn ignition
on.
4) Check for voltage at Brown wire of turn signal switch
steering column connector. If voltage is present, go to next step. If
voltage is not present, repair open circuit between flasher and turn
signal switch connector.
5) Turn hazard warning switch "ON". Check for pulsating
voltage at Light Blue, Dark Blue, Yellow, and Dark Green wires. If
voltage is present, hazard light circuit is okay. If voltage is not
present, replace turn signal switch.
Turn Signals (Wrangler)
1) Turn ignition on and check operation of back-up lights. If
lights come on, go to step 3). If back-up lights do not come on, check
turn signal/back-up light fuse.
2) If fuse is okay, check for voltage at battery side of turn
signal/back-up light fuse. If voltage is not present, repair open
circuit between fuse block and ignition switch. If voltage is present,
go to next step.
3) Remove turn signal flasher and measure resistance across
flasher terminals. If resistance across flasher is zero ohms, replace
turn signal flasher. If flasher is okay, install flasher and turn
ignition on.
4) Check for voltage on battery side of flasher at fuse
block. If voltage is present, go to next step. If voltage is not
present, repair open circuit to fuse block.
5) Disconnect turn signal switch at steering column
connector. Place turn signal switch in left turn position and measure
resistance between Yellow and Purple wires. If resistance across wires
is zero ohms, replace turn signal switch. If resistance is other than
zero ohms, go to next step.
6) Place turn signal switch in right turn position and
measure resistance between Dark Green and Purple wires. If resistance
across wires is zero ohms, replace turn signal switch. If resistance
is other than zero ohms, turn signal circuit is okay.
Turn Signal Indicators (Wrangler)
1) Turn ignition on. Place turn signal switch in left turn
position and check for pulsating voltage at Light Blue wire. If
voltage is present, go to next step. If voltage is not present,
replace turn signal switch.
2) Place turn signal switch in right turn position and check
for pulsating voltage at Dark Blue wire. If voltage is not present,
replace turn signal switch. If voltage is present, go to next step.
3) Remove bulbs from turn signal indicators. Measure
resistance across bulb terminals. If resistance is zero ohms, replace
light bulb(s). If resistance readings are not zero ohms, turn ignition\
on.
4) Place turn signal switch in left and right turn position
and check for pulsating voltage at battery side of bulb sockets. If
voltage is present, go to next step. If voltage is not present, repair
open circuit between socket(s) and steering column connector.

5) Turn ignition off and check resistance on ground side of
bulb sockets. If resistance is zero ohms, turn signal indicator
circuit is okay. If resistance reading is not zero ohms, repair open
in ground circuit.

UNIV ER SA L J O IN TS

1988 J e ep C hero ke e
1988 Drive Shafts - Universal Joints
All Manufacturers
MAINTENANCE
Whenever drive shaft is removed from vehicle of if slip yoke
sticks in extension housing seal, clean yoke with solvent. Lubricate
inside diameter of seal with synthetic oil seal lubricant, and outside
diameter of seal with transmission fluid.
OVERHAUL
NOTE: Universal joints should not be disassembled unless external
leakage or damage has occurred.
Before disassembly, scribe alignment marks on yoke and shaft
to allow reassembly in original position. If joints are rusted or
corroded, apply penetrating oil before pressing out bearing cups or
trunnion pin.
CROSS SHAFT & ROLLER TYPE UNIVERSAL JOINTS
There are 2 different retaining methods used for bearing
cups, either snap rings or nylon retainers. Joints with snap rings may
be taken apart and reassembled, using same cross shaft and bearings.
Joints with nylon retainers are disassembled by breaking nylon
retainers. Retainers must be replaced after service.
Removal & Disassembly
1) Disconnect yoke or flange attaching bolts and remove drive
shaft from vehicle.
NOTE: DO NOT use a pry bar to hold drive shaft while loosening
bolts. Damage to bearing seals may result.
Fig. 1: Exploded View of Jeep Constant Velocity Type Universal Joint
2) Remove retaining strap (if equipped). Remove bushing
retainers from yoke. Press out rollers and bearings. Remove last
roller and bushing assembly by pressing on end of cross shaft.

3) Remove cross shaft assembly from yoke. DO NOT remove seal
retainers from cross shaft. Cross shaft and retainers are serviced as
an assembly.
Reassembly
1) Coat roller and bearing assemblies with lubricant, and
fill reservoirs in ends of cross. Place cross assembly in drive shaft
yoke, and place roller and bushing assemblies into position.
2) Press both bushing assemblies into yoke until retainers
can be installed, being careful to keep cross aligned in center of
bushings. Install retainers, then repeat procedure for remaining
bushings.
CONSTANT VELOCITY (CV) TYPE
NOTE: To prevent damage to constant velocity joints, center ball
when removing drive shaft assembly. When handling drive shaft
after removal, support shafts on both sides of constant
velocity joint if drive shaft is being moved horizontally.
DO NOT allow one end to hang free or one shaft to bend at
sharp angle. After removal, shaft may be carried vertically
without damage.
Removal & Disassembly (Jeep)
1) Disconnect yoke attaching bolts and flange attaching
bolts, and remove drive shaft from vehicle. Mark joint so that center
yoke, end yoke, and cross shafts will be installed in original
positions.
2) Pry out all snap rings and press bearing out enough to
allow bearing end to be clamped in vise. Tap on yoke until it is free
of bearing.
3) Repeat procedure for remaining bearings. Remove remaining
parts from center yoke assembly.
Reassembly
1) Pack all bearings with specified grease. Assemble center
yoke components in reverse order of disassembly.
2) Using arbor press or vise, press 2 opposing bearings into
osition at same time until all bearings are installed. Be sure cross
shafts and yokes remain aligned during this process.
3) Check for free movement of joint. If bind exists, seat
bearings by sharply rapping yokes with brass hammer. Never hammer on
bearings.
4) Install drive shaft in vehicle, making sure marks made
during disassembly are aligned.
Installation (All Models)
NOTE: The drive shaft assembly, with cross and bearings installed,
must have its yoke ears at each end of the shaft on same
plane.
1) Before installing drive shaft, clean yoke and inspect
machined surface for scratches, nicks or burrs.
2) Provide support for drive shaft during installation to
prevent damage to universal joints. Position front end of shaft and
aligning marks noted during removal.
3) Install and attach 2 clamps to pinion yoke. Install 4
screws and lock washer assemblies on CV joint at transfer case. Use
press bar to prevent assembly from rotating while attaching screw
assemblies.