1988 JEEP CHEROKEE Service Repair Manual

MAIN TE N AN CE R EM IN DER L IG HT R ESET P R O CED URES

1988 J e ep C hero ke e
1988-92 MAINTENANCE
Chrysler Motors Maintenance Reminder Lights
Jeep; Cherokee, Comanche, Wagoneer (1988-90), Wrangler
EMISSION MAINTENANCE INDICATOR LIGHT (1988-90)
Vehicles are equipped with an emission maintenance indicator
light on instrument cluster. This light will come on one time at 82,
500 miles to alert driver that emission service is required. At this
time, oxygen sensor and PCV valve must be replaced and all other
emission components should be inspected and serviced or replaced as
necessary.
Indicator timer is located under dash, near accelerator pedal
or to right of steering column. Timer cannot be reset. To turn off
light, timer must be replaced or disconnected. Since timer and sensor
are interdependent, if timer should fail prematurely, oxygen sensor
should be replaced at same time to preserve correct replacement
interval.
To replace timer on Cherokee, Comanche and Wagoneer models,
remove cruise control module (if equipped). Remove timer mounting
screws. Disconnect electrical connector. On Wrangler models, remove
timer mounting screws. Disconnect electrical connector. On all models,
install remaining components.
EMISSION MAINTENANCE INDICATOR LIGHT (1991-92)
Vehicles are equipped with an emission maintenance indicator
light on instrument cluster. This light will come on one time at 82,
500 miles to alert driver that emission service is required. At this
time, oxygen sensor must be replaced and all other emission components
should be inspected and serviced or replaced as necessary. Chrysler's
Diagnostic Readout Box (DRB-II) tester is required to reset the
emission maintenance indicator light.
Reset Procedure
Using DRB-II tester, access SELECT SYSTEMS. Select
appropriate engine. Select with or without A/C. Select FUEL &
IGNITION. Select ADJUSTMENTS. Select RESET EMR LIGHT. Reset EMR light.
When DRB-II is finished resetting light, DRB-II display will read EMR
LIGHT IS RESET.

METR IC C O NVER SIO NS

1988 J e ep C hero ke e
GENERAL INFORMATION
METRIC CONVERSIONS
METRIC CONVERSIONS
Metric conversions are making life more difficult for the
mechanic. In addition to doubling the number of tools required,
metric-dimensioned nuts and bolts are used alongside English
components in many new vehicles. The mechanic has to decide which tool
to use, slowing down the job. The tool problem can be solved by trial
and error, but some metric conversions aren't so simple. Converting
temperature, lengths or volumes requires a calculator and conversion
charts, or else a very nimble mind. Conversion charts are only part of
the answer though, because they don't help you "think" metric, or
"visualize" what you are converting. The following examples are
intended to help you "see" metric sizes:
LENGTH
Meters are the standard unit of length in the metric system.
The smaller units are 10ths (decimeter), 100ths (centimeter), and
1000ths (millimeter) of a meter. These common examples might help you
to visualize the metric units:
* A meter is slightly longer than a yard (about 40 inches).
* An aspirin tablet is about one centimeter across (.4 inches).
* A millimeter is about the thickness of a dime.
VOLUME
Cubic meters and centimeters are used to measure volume, just
as we normally think of cubic feet and inches. Liquid volume
measurements include the liter and milliliter, like the English quarts
or ounces.
* One teaspoon is about 4 cubic centimeters.
* A liter is about one quart.
* A liter is about 61 cubic inches.
WEIGHT
The metric weight system is based on the gram, with the most
common unit being the kilogram (1000 grams). Our comparable units are
ounces and pounds:
* A kilogram is about 2.2 pounds.
* An ounce is about 28 grams.
TORQUE
Torque is somewhat complicated. The term describes the amount
of effort exerted to turn something. A chosen unit of weight or force
is applied to a lever of standard length. The resulting leverage is
called torque. In our standard system, we use the weight of one pound
applied to a lever a foot long, resulting in the unit called a foot-
pound. A smaller unit is the inch-pound (the lever is one inch long).
Metric units include the meter kilogram (lever one meter long
with a kilogram of weight applied) and the Newton-meter (lever one

meter long with force of one Newton applied). Some conversions are:
* A meter kilogram is about 7.2 foot pounds.
* A foot pound is about 1.4 Newton-meters.
* A centimeter kilogram (cmkg) is equal to .9 inch pounds.
PRESSURE
Pressure is another complicated measurement. Pressure is
described as a force or weight applied to a given area. Our common
unit is pounds per square inch. Metric units can be expressed in
several ways. One is the kilogram per square centimeter (kg/cm
).
Another unit of pressure is the Pascal (force of one Newton on an area
of one square meter), which equals about 4 ounces on a square yard.
Since this is a very small amount of pressure, we usually see the
kiloPascal, or kPa (1000 Pascals). Another common automotive term for
pressure is the bar (used by German manufacturers), which equals 10
Pascals. Thoroughly confused? Try the examples below:
* Atmospheric pressure at sea level is about 14.7 psi.
* Atmospheric pressure at sea level is about 1 bar.
* Atmospheric pressure at sea level is about 1 kg/cm
.
* One pound per square inch is about 7 kPa.
CONVERSION FACTORS
CONVERSION FACTORS
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TO CONVERT TO  MULTIPLY BY 
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LENGTH
  

Millimeters (mm) Inches  .03937 

Inches Millimeters  25.4 

Meters (M) Feet  3.28084 

Feet Meters  .3048 

Kilometers(Km) Miles  .62137 
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AREA
  

Square Centimeters (cm) Square Inches  .155 

Square Inches Square Centimeters  6.45159 
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VOLUME
  

Cubic Centimeters Cubic Inches  .06103 

Cubic Inches Cubic Centimeters  16.38703 

Liters Cubic Inches  61.025 

Cubic Inches Liters  .01639 

Liters Quarts  1.05672 

Quarts Liters  .94633 

Liters Pints  2.11344 

Pints Liters  .47317 

Liters Ounces  33.81497 

Ounces Liters  .02957 
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WEIGHT
  

Grams Ounces  .03527 

Ounces Grams  28.34953 

Kilograms Pounds  2.20462 

Pounds Kilograms  .45359 
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WORK
  

Centimeter Kilograms Inch Pounds  .8676 

Pounds/Sq. Inch Kilograms/Sq.Centimeter .07031 

Bar Pounds/Sq. Inch  14.504 

Pounds/Sq. Inch Bar  .06895 

Atmosphere Pounds/Sq. Inch  14.696 

Pounds/Sq. Inch Atmosphere  .06805 
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TEMPERATURE
  

Centigrade Degrees Fahrenheit Degrees (Cx(9)/5)+32 

Fahrenheit Degrees Centigrade Degrees (F-32)x(5)/9 
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CONVERSION FACTORS (Cont.)
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INCHES DECIMALS mm

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1/64 ...................... .016 ........................ .397 

1/32 ...................... .031 ........................ .794 

3/64 ...................... .047 ....................... 1.191 

1/16 ...................... .063 ....................... 1.588 

5/64 ...................... .078 ....................... 1.984 

3/32 ...................... .094 ....................... 2.381 

7/64 ...................... .109 ....................... 2.778 

1/8 ....................... .125 ....................... 3.175 

9/64 ...................... .141 ....................... 3.572 

5/32 ...................... .156 ....................... 3.969 

11/64 ..................... .172 ....................... 4.366 

3/16 ...................... .188 ....................... 4.763 

13/64 ..................... .203 ....................... 5.159 

7/32 ...................... .219 ....................... 5.556 

15/64 ..................... .234 ....................... 5.953 

1/4 ....................... .250 ....................... 6.350 

17/64 ..................... .266 ....................... 6.747 

9/32 ...................... .281 ....................... 7.144 

19/64 ..................... .297 ....................... 7.541 

5/16 ...................... .313 ....................... 7.938 

21/64 ..................... .328 ....................... 8.334 

11/32 ..................... .344 ....................... 8.731 

23/64 ..................... .359 ....................... 9.128 

3/8 ....................... .375 ....................... 9.525 

25/64 ..................... .391 ....................... 9.992 

13/32 ..................... .406 ...................... 10.319 

27/64 ..................... .422 ...................... 10.716 

7/16 ...................... .438 ...................... 11.113 

29/64 ..................... .453 ...................... 11.509 

15/32 ..................... .469 ...................... 11.906 

31/64 ..................... .484 ...................... 12.303 

1/2 ....................... .500 ...................... 12.700 

33/64 ..................... .516 ...................... 13.097 

17/32 ..................... .531 ...................... 13.494 

35/64 ..................... .547 ...................... 13.891 

9/16 ...................... .563 ...................... 14.288 

37/64 ..................... .578 ...................... 14.684 

19/32 ..................... .594 ...................... 15.081 

39/64 ..................... .609 ...................... 15.478 

5/8 ....................... .625 ...................... 15.875 

41/64 ..................... .641 ...................... 16.272 

21/32 ..................... .656 ...................... 16.669 

43/64 ..................... .672 ...................... 17.066 

11/16 ..................... .687 ...................... 17.463 

45/64 ..................... .703 ...................... 17.859 

23/32 ..................... .719 ...................... 18.256 

47/64 ..................... .734 ...................... 18.653 

3/4 ....................... .750 ...................... 19.050 

49/64 ..................... .766 ...................... 19.447 

25/32 ..................... .781 ...................... 19.844 

51/64 ..................... .797 ...................... 20.241 

13/16 ..................... .813 ...................... 20.638 

53/64 ..................... .828 ...................... 21.034 

27/32 ..................... .844 ...................... 21.431 

55/64 ..................... .859 ...................... 21.828 

7/8 ....................... .875 ...................... 22.225 

57/64 ..................... .891 ...................... 22.622 

29/32 ..................... .906 ...................... 23.019 

59/64 ..................... .922 ...................... 23.416 

15/16 ..................... .938 ...................... 23.813 

61/64 ..................... .953 ...................... 24.209 

31/32 ..................... .969 ...................... 24.606 

63/64 ..................... .984 ...................... 25.003 

1 ......................... 1.000 ..................... 25.400 
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MIR RO RS - P O W ER

1988 J e ep C hero ke e
1988 Power Mirrors
JEEP
DESCRIPTION
Outside power rear view mirrors consist of door-mounted
mirrors with internal motor drive and backing plate. The Ford
electronic day/night mirror will change from normal to non-glare
position when glare reaches mirror. The non-glare functions only at
night.
TESTING
Mirror Motors & Switches
1) Ensure fuse is okay by operating interior lights. If
neither mirror operates, check for battery voltage at power mirror
switch assembly. Connect a voltmeter between terminal "G" (Red with
White stripe) and ground. If battery voltage is present, connect
voltmeter between terminals "G" and "F" (Black). If battery voltage is\
not present, check circuit at Red with White stripe wire and Black
wire.
2) If one mirror does not operate, connect a voltmeter across
power mirror switch assembly terminals. See Fig. 1. Voltage will be
present when control switch and mirror select switch are operated for
that motor.
Fig. 1: Jeep Switch Assembly Check Chart
Courtesy of American Motors/Jeep Corp.
3) If voltage is present but mirror does not operate, check
motor and wiring. If voltage is not present when 2 switches are on,

replace switch assembly.

PO W ER S TE ER IN G G EN ER AL S ER VIC IN G

1988 J e ep C hero ke e
1988 STEERING
Jeep Power Steering General Servicing
Cherokee, Comanche, Grand Wagoneer, Pickup, Wagoneer,
Wrangler
LUBRICATION
SERVICE INTERVALS
Check fluid at every oil change.
CHECKING FLUID LEVEL
Check fluid level with engine stopped and fluid hot or cold.
Fluid level must be at "FULL-HOT" or "FULL-COLD" mark on dipstick. On
models with remote reservoir, keep fluid level 0.5-1.0" from top of
reservoir with wheels turned fully to left.
RECOMMENDED FLUID TABLE









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Application Part Number
Jeep ............................................. 8993342









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REFILLING & BLEEDING SYSTEM
1) Fill reservoir to correct level. Operate engine until
fluid reaches normal operating temperature. Stop engine. Add fluid (if
necessary). Turn wheels to full left position. Add fluid to reservoir
to fill to "FULL-COLD" mark on dipstick.
2) Start and operate engine at fast idle. Recheck reservoir
level. Add to "FULL-COLD" mark on dipstick. Turn wheels from side to
side without contacting stops. Maintain fluid level just above pump
body.
3) When air is removed, return wheels to straight-ahead
position. Operate engine 2-3 minutes. Stop engine. Road test vehicle.
Recheck fluid level. Level should be at "FULL-HOT" position after
system has stabilized. Add fluid (if necessary). DO NOT overfill.
BELT TENSION (Tension in Lbs. Using Boroughs Tension Gauge)









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Application New Belt Used Belt
Jeep ................ ( 1) 125-155 ............... 90-115
( 1) - Cherokee, Comanche and Wagoneer is 120-140 lbs.









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TROUBLE SHOOTING
Refer to TROUBLE SHOOTING - BASIC PROCEDURES article in the
GENERAL TROUBLE SHOOTING section.
TESTING