mileage JEEP CHEROKEE 1988 Service Repair Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
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CO M PU TE R R ELE A R N P R O CED URES
1988 J e ep C hero ke e
GENERAL INFORMATION
Computer Relearn Procedures
All Models
* PLEASE READ THIS FIRST *
The following general procedures are to be used if
driveability problems are encountered after power loss or battery has
been disconnected. These procedures may provide an aid in eliminating
these problems.
To reduce the possibility of complaints, after any service
which requires battery power to be disconnected, vehicle should be
road tested.
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
Customers often complain of driveability problems during
relearn stage because vehicle acts differently then before being
serviced. Depending on type and make of vehicle and how it is
equipped, the following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be
disconnected, vehicle should be road tested. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select
"D" and allow engine to idle for one minute.
* Accelerate at normal throttle position (20-50%) until vehicle
shifts into top gear.
* Cruise at light to medium throttle.
* Decelerate to a stop, allowing vehicle to downshift, and use
brakes normally.
* Process may be repeated as necessary.
Manual Transmission
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If equipped, the EMR light (some models may use a reminder
flag) reminds vehicle operator that an emission system maintenance is
required. This indicator is activated after a predetermined
time/mileage.
When performing a smog check inspection, ensure EMR indicator
is not activated. On models using an EMR light, light should glow when
ignition switch is turned to ON position and should turn off when
engine is running.
If an EMR flag is present or an EMR light stays on with
engine running, fail vehicle and service or replace applicable
emission-related components. To reset an EMR indicator, refer to
appropriate MAINTENANCE REMINDER LIGHTS in the MAINTENANCE section.
MALFUNCTION INDICATOR LIGHT (MIL)
The Malfunction Indicator Light (MIL) is used to alert
vehicle operator that the computerized engine control system has
detected a malfunction (when it stays on all the time with engine
running). On some models, the MIL may also be used to display trouble
codes.
As a bulb and system check, malfunction indicator light will
glow when ignition switch is turned to ON position and engine is not
running. When engine is started, light should go out.
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5 - Transmission/(Transfer Case)
A * Auto Column Shift (2WD)
B * Auto Floor Shift (Part Time 4WD)
C * Auto Floor Shift (Full Time 4WD)
D * Auto Floor Shift (2WD)
E * Auto Column Shift (Part Time 4WD)
J * Auto Column Shift (Full Time 4WD)
L * 5-Speed Manual Floor Shift (Part Time 4WD)
N * 5-Speed Manual Floor Shift (Full Time 4WD)
S * 4-Speed Manual Floor Shift (2WD)
W * 5-Speed Manual Shift (2WD)
X * 4-Speed Manual Floor Shift (Part Time 4WD)
6-7 - Body Style
73 * Cherokee Wagon 2-Door (2WD)
74 * Cherokee Wagon 4-Door (2WD)
75 * Wagoneer Wagon 4-Door (4WD)
77 * Cherokee Wagon 2-Door (4WD)
78 * Cherokee Wagon 4-Door (4WD)
8 - Trim Package
1 * Custom
2 * Pioneer
3 * Chief
4 * Laredo
5 * Base
5 * Wagoneer
6 * Limited
K * Cherokee Base (2WD)
L * Pioneer (2WD)
M * Laredo (2WD)
9 - Check Digit
* Manufacturer Assigned
10 - Model Year
E * 1984
F * 1985
G * 1986
H * 1987
J * 1988
11 - Assembly Plant
T * Toledo, Ohio
12-17 - Sequential Serial Number
* Production Sequence
MAINTENANCE SERVICE INFORMATION
SEVERE & NORMAL SERVICE DEFINITION
NOTE: Use the Severe Service schedule if the vehicle to be serviced
is operated under ANY (one or more) of these conditions:
Service is recommended at specified mileage intervals of
vehicle operation. Service schedules are based on the following
primary operating conditions:
Severe Service
* Short Trips (About 15 Miles)
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* Cold Climate Operation
* Towing Or Heavily Loading
* Severe Dust Conditions
* Sustained High Speed Operation
* Off-Road Driving
* Hot Weather, Stop-And-Go Driving
* Extensive Idling Conditions (Taxi Or Delivery Type Service)
Normal Service
* Driven More Than 10 Miles Daily
* No Severe Service Operating Conditions
CAMSHAFT TIMING BELT REPLACEMENT INFORMATION (TURBO-DIESEL)
CAUTION: Failure to replace a faulty camshaft timing belt may result
in serious engine damage.
The condition of camshaft drive belts should always be
checked on vehicles which have more than 50,000 miles. Although some
manufacturers do not recommend belt replacement at a specified
mileage, others require it at 60,000-100,000 miles. A camshaft drive
belt failure may cause extensive damage to internal engine components
on most engines, although some designs do not allow piston-to-valve
contact. These designs are often called "Free Wheeling".
Many manufacturers changed their maintenance and warranty
schedules in the mid-1980's to reflect timing belt inspection and/or
replacement at 50,000-60,000 miles. Most service interval schedules
reflect these changes.
Belts or components should be inspected and replaced if any
of the following conditions exist:
* Cracks Or Tears In Belt Surface
* Missing, Damaged, Cracked Or Rounded Teeth
* Oil Contamination
* Damaged Or Faulty Tensioners
* Incorrect Tension Adjustment
SERVICE LABOR TIMES
SERVICE LABOR TIMES TABLE (HOURS)\
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Application Mile Service Mile Service
2.1L (Turbo Diesel)
Automatic Transmission ........... 4.3 ................ 4.5
Manual Transmission .............. 3.6 ................ 3.8
2.5L
Automatic Transmission ........... 5.6 ................ 3.5
Manual Transmission .............. 4.9 ................ 3.5
2.8L
Automatic Transmission ........... 5.8 ................ 3.7
Manual Transmission .............. 5.1 ................ 3.7
4.0L
Automatic Transmission ........... 5.7 ................ 3.6
Manual Transmission .............. 5.0 ................ 3.6
( 1) - Add .8 hr. for vehicles equipped with 4WD.
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WARNING: DO NOT USE starting fluids (ether) or flammable liquids to
aid the starting of a Cummins Turbo-Diesel. NEVER pour diesel
fuel, flammable liquids or starting fluids into the air
cleaner canister, air intake or turbocharger housing in an
attempt to start the vehicle. A flash fire may result causing
personal injury.
TRANSFER CASE
CAUTION: Both drive axles are disengaged when transmission gear is
in Neutral position. Always set parking brake when leaving
vehicle unattended.
CAUTION: Never attempt to engage Low range when vehicle is moving
faster than 2-3 MPH (3-5 KM/H). Transfer case damage may
result.
GASOLINES CONTAINING ALCOHOL
CAUTION: Exclusive use of gasohol is not recommended. Vehicle test
results have shown that significant fuel system corrosion
can result when gasohol is used exclusively. Fuel additives
which are now being sold as octane enhancers are not
recommended. Most of these products contain high
concentrations of methanol.
WARRANTY INFORMATION
CAUTION: Due to the different warranties offered in various regions
and the variety of after-market extended warranties
available, please refer to the warranty package that came
with the vehicle to verify all warranty options.
BASIC NEW CAR WARRANTY
Jeep Corporation warrants to the original purchaser that the
vehicle is free from defects under normal use and service for 12
months or 12,000 miles, whichever comes first.
POWERTRAIN PROTECTION LIMITED WARRANTY
Begins at 12 months or 12,000 miles and lasts for 7 years or
70,000 miles, whichever comes first. Warranty covers Engine,
Transmission, Transfer Case, and Drive Shaft/Drive Axle(s) for RWD &
4WD.
Items not covered include, normal scheduled maintenance,
tune-ups, clutch adjustments, lack of proper maintenance, and vehicles
on which the mileage cannot readily be determined. A 100.00 deductible
on 2WD models and a 150.00 deductible on 4WD models applies to each
repair visit.
Powertrain Warranty also covers cost of towing to nearest
Jeep Dealer if vehicle cannot be driven due to failure of a covered
powertrain part.
ANTI-CORROSION PERFORATION WARRANTY
Warrants the sheet metal parts of the vehicle against
perforation (rust-through) due to corrosion. It covers any body sheet
metal panel for unlimited mileage during the first 36 months. Outer-
body sheet metal panels are covered for 7 years or 100,000 miles,
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Fig. 5: Identification Label Locations
Courtesy of American Motors Corp.
SPARK PLUG REPLACEMENT INTERVALS
Spark plug replacement intervals, if given, are for Original
Equipment Manufacturer (OEM) installed or specified plugs. If vehicle
is equipped with platinum type or other non-OEM type spark plugs,
follow replacement interval specified by spark plug manufacturer.
OXYGEN SENSOR
If vehicle is equipped with an oxygen sensor, replace at 82,
500 miles or when the emissions maintenance reminder light remains on
continuously with the key in the ON position, whichever occurs first.
SEVERE & NORMAL SERVICE DEFINITIONS
CAUTION: Use the Severe Service schedule if the vehicle to be serviced
is operated under ANY (one or more) of these conditions:
Service is recommended at mileage intervals based on vehicle
operation. Normal Service and Severe Service are based on the
following primary operating conditions:
Severe Service
* Short Trips (About 15 Miles)
* Desert Or Cold Climate Operation
* Towing Or Heavily Loaded
* Severe Dust Conditions
* Hot Weather, Stop-And-Go Driving
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![JEEP CHEROKEE 1988 Service Repair Manual Conditions (Taxi \
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Or Delivery Type Replace Engine Oil 6,000 Miles or 6 Month")
Conditions (Taxi \
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Or Delivery Type Replace Engine Oil 6,000 Miles or 6 Months
Service) Filter
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Replace Front And/Or 12,000 Miles
Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Driving Off-Road Replace Engine Oil 3,000 Miles or 3 Months
Or In Salty Or
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Filter
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Replace 4WD: Engine 50 Hours
Oil
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Replace Front And/Or 12,000 Miles
Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Driving In Water Replace Engine Oil 3,000 Miles or 3 Months
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Replace Engine Oil 6,000 Miles or 6 Months
Filter
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Service Lube Prop 3,000 Miles
Shaft If
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Replace A/T Fluid 12,000 Miles
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Rear Axle Oil
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Replace M/T Fluid Oil 18,000 Miles
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Service Lube Prop Daily
Shaft Slip
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1) - Perform these services at the mileage, hours of operation, or
number of months (since last time), whichever comes first.
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Rear ......................................... 2.5 Pts. (1.2L)
Rear (Trac-Lok) (
4) .......................... 2.5 Pts. (1.2L)
(
1) - Capacities are recommended or calculated levels. Always use
dipstick (if available) to measure level.
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2) - Includes 2.3 qts. for coolant recovery bottle.
(
3) - Fill to bottom of filler plug hole.
(
4) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant
additive first, then add new fluid.
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Service Labor Times
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Application Hours
2.5L
Automatic Transmission ................................... 3.5
Manual Transmission ...................................... 3.5
2.8L
Automatic Transmission ................................... 3.7
Manual Transmission ...................................... 3.7
4.0L
Automatic Transmission ................................... 3.6
Manual Transmission ...................................... 3.6
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LUBRICATION SPECIFICATIONS
LUBRICATION SPECIFICATIONS TABLE\
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Application Fluid Specifications
Automatic Transmission ......................... Dexron-IIE ATF
Brake Master Cylinder ......... DOT 3 (SAE J-1703F) Brake Fluid
Engine Coolant .......... Alugard 340-2 & Water (50/50 Mixture)
Engine Oil ( 1)
Gasoline Engine
Temperature Range
Above 30
F (-1
C) ....... SAE 20W-40 Or 20W-50 API SH/CD
Above 0
F (-18
C) ........ SAE 10W-30 Or 10W-40 API SH/CD
Less Than 60
F (16
C) .............. SAE 5W-30 API SH/CD
Drive Axles ............................... SAE 75W-90 API GL-5
Drive Axles (Trac-Lok) ( 2) ............... SAE 80W-140 API GL-5
Drive Axles (Trailer Towing) ............. SAE 80W-140 API GL-5
Hydraulic Clutch .............. DOT 3 (SAE J-1703F) Brake Fluid
Manual Transmission ....................... SAE 75W-90 API GL-5
Manual Steering Box .............. Multi-Purpose NLGI Grade 2EP
Power Steering Pump ...................... Power Steering Fluid
Transfer Case .................................. Dexron-IIE ATF
Brake Caliper Bushings ....... GE 661 or DOW 111 Silicone Grease
Caliper Slide Pins .......... GE 661 or DOW 111 Silicone Grease
Wheel Bearings ........... Mopar Multi-Purpose NLGI Grade GC-LB
Drive Shaft U-Joints ....... Mopar Multi-Purpose NLGI Grade 2EP
Steering Linkage ( 4)( 5) ...... Mopar Multi-mileage or equivalent
Ball Joints ( 4)( 6) ........... Mopar Multi-mileage or equivalent
Weatherstrip ......................... Silicone Spray Lubricant
( 1) - SAE 10W-30 SH/CD is preferred.
( 2) - Add 4 ozs. (118 ml) of Limited-Slip differential lubricant
additive when changing fluid.
( 3) - For vehicles operating under heavy-duty towing conditions,
use SAE 75W-140 Synthetic lube.
NOTE: Before using SAE 75W-140 Synthetic the old fluid must be
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setting, see ENGINE
PERFORMANCE
Vacuum leak Eliminate vacuum leak
EGR valve malfunction Replace EGR valve
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Poor Gasoline Cracked or broken vacuum Replace vacuum hoses
Mileage hoses
Vacuum leaks Repair vacuum leaks
Defective ignition wires Replace wires
Incorrect choke setting Readjust setting, see
ENGINE PERFORMANCE
Defective vacuum advance Replace vacuum advance
Defective spark plugs Replace spark plugs
Binding carburetor power Eliminate binding
piston
Dirt in carburetor jets Clean and/or replace
jets
Incorrect float adjustment Readjust float
setting, see FUEL
Defective power valve Replace power valve,
see ENGINE PERFORMANCE
Incorrect idle speed Readjust idle speed
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Engine Stalls Improper float level Readjust float level
Leaking needle valve and Replace needle valve
seat and seat
Vacuum leaks Eliminate vacuum
leaks
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VACUUM PUMP - DIESEL TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
NOTE: Diesel engines mechanical diagnosis is the same as gasoline
engines for items such as noisy valves, bearings, pistons,
etc. The following trouble shooting covers only items
pertaining to diesel engines.
VACUUM PUMP (DIESEL) TROUBLE SHOOTING CHART
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CONDITION POSSIBLE CAUSE CORRECTION \
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