sensor JEEP CHEROKEE 1988 Service Repair Manual









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EMISSIONS RECALL - OXYGEN SENSOR REPLACEMENT
Dear Chrysler Vehicle Owner:
Chrysler Corporation and the Environmental Protection Agency has
determined that the oxygen sensor on certain Cherokee, Wagoneer and
Comanche models may be susceptible to failure. Failure of the oxygen
sensor may cause your vehicle to be in violation of Federal Emissions
Standards. For this reason, we are asking you to return your vehicle,
identified by the Vehicle Identification Number on the enclosed form,
to your dealer for a special service repair. This service will be
provided free of charge.
The needed instructions have been sent to all involved dealers. The
service will not hurt your engine performance or fuel economy. To
obtain this service:
* Contact your Jeep/Eagle dealer as soon as possible to make an
appointment for the free service.
* Take the enclosed Owner Notification Form with you at the time of
your appointment and give it to your dealer. The form identifies
the vehicle and recall for which service is required.
* The dealer will inspect and replace the oxygen sensor if
necessary. The service will take about one-half hour, but
additional time may be required depending on how service
appointments are scheduled and processed.
In order to ensure your full protection under the emission warranty
made applicable to your vehicle under Federal law, and your right to
participate in future recalls, it is recommended that you have your
vehicle serviced as soon as possible. Failure to do so could legally
be determined to be a lack of proper maintenance of your vehicle.
Further, without this repair your vehicle may fail a state or local
emission inspection test.
If you have any problem obtaining the service, please contact the
Chrysler Zone Service Office in your area. (It is listed under
"Service Assistance" in your Owner's Manual.} A Zone representative
will arrange for prompt servicing of your vehicle. If you are still
unable to obtain the repair as described in this letter within a
reasonable time, you may also contact the Manufacturers Operations
Division of the Environmental Protection Agency (6405d), 401 M Street
S. W., Washington, D. C. 20460.
We regret any inconvenience this action may cause, but trust you
understand our interest in clean air and in your continuing
satisfaction with our product. Thank you for your prompt attention to
this important matter.
Customer Services Field Operations
Chrysler Corporation









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COMPLETION REPORTING & REIMBURSEMENT
Claims for vehicles which have been serviced must be submitted on
the DIAL System. Claims submitted will be used by Chrysler to record
recall service completions and provide dealer payments.

Use ONE of the following labor operation numbers and time
allowances:
Labor Operation No.: 25561181 - Inspect Oxygen Sensor
Time Allowance: 0.2 hr.
Labor Operation No.: 25561182 - Replace Oxygen Sensor
Time Allowance: 0.3 hr.
Add the cost of the recall parts package plus applicable dealer
allowance to your claim.
Parts Return
Initially, a small number of oxygen sensors are required to be
returned to the Warranty Material Return Center. When an adequate
number of returned parts have been accumulated, Parts Return Documents
will no longer be generated and parts are to be discarded.
NOTE: See Warranty Policy and Procedure Manual, Chapter 6,
Subsection H for complete recall claim processing and
material return instructions.
Vehicle Not Available
If a vehicle is not available for service for a known reason, let us
know by filling out the pre-addressed Vehicle Disposition Form portion
of the Owner Notification Form or describe the reason on a postcard
and mail to:
Chrysler Corporation 429-10-04
P.O. Box 1919
Detroit, Michigan 48231-1919
Following the above procedures will expedite the processing of your
claim.
If you have any questions or need assistance in completing this
action, please contact your Zone Service Office.

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

82,500 MILE (132,000 KM) SERVICE
82,500 MILE (132,000 KM) SERVICE







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Service Or Inspect 









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Verify Last Major Service Was Performed 




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 Check Fluid Levels 




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 Check Cooling System Hoses and Clamps 




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 Check Exhaust System & Heat Shielding 




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 Inspect Brake System 




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 Inspect C/V Joint boots (4WD) 




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 Inspect Underside of Vehicle (Bolts & Threaded Fasteners) 




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 Check/Lube Manual Steering Gear 




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 Check Drive Shaft Seals 




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 Lubricate Ball Joints, Steering Linkage & Suspension 




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 Lube Drive Shaft U-Joints and Slip Splines 




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 Lube Front Axle Drive Joint and Pivot Bearings (4WD) 




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 Rotate Tires and Adjust Air Pressure (Including Spare) 











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Replace 









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 Engine Oil 




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 Oil Filter, if it has not been changed in the last 12 months 




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 O2 Sensor (1987-89) 




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 Flush and Fill Engine Coolant, if not done in last 24 months 











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Lubrication Specifications 










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Application Specification 



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 

Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB 

Door & Hood Hinges ............................ Light Engine Oil 

SPA R K C O NTR O L S YSTE M

1988 J e ep C hero ke e
1988 Exhaust Emission Systems
JEEP SPARK CONTROL SYSTEMS
DESCRIPTION
Jeep vehicles use spark control devices to assist ignition
system in controlling exhaust emissions. They are Spark Control
Temperature Override (CTO) valve, Non-Linear Vacuum Regulator (NLVR)\
valve, Forward Delay Valve, Reverse Delay Valve and on 4-cylinder
engines, Vacuum Spark Control Delay Valve. System application depends
upon engine size, emissions category and vehicle model.
COOLANT TEMPERATURE SENSOR (CTS)
The coolant temperature sensor is located in the intake
manifold coolant jacket. This sensor provides a voltage signal to the
Electronic Control Unit (ECU). The ECU uses this signal to determine
engine temperature. During cold engine operation, the ECU responds by
increasing ignition advance and inhibiting EGR operation.
NON-LINEAR VACUUM REGULATOR VALVE (NLVR)
NLVR valve is used on carbureted 6.0L models. This valve
supplies vacuum advance unit with a regulated combination of manifold
and carburetor ported vacuum when engine load is low and switches to
supply only carburetor ported vacuum as load increases.
Fig. 1: Non-Linear Vacuum Regulator Valve
Courtesy of Chrysler Motors.
OPERATION

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* S TE ER IN G U NIF O RM IN SPEC TIO N G UID ELIN ES *

1 988 J e ep C hero ke e
GENERAL INFORMATION
Steering, Suspension, Wheel Alignment, Wheels and Tires
Motorist Assurance Program
Standards For Automotive Repair
All Makes and Models
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
CONTENTS
Motorist Assurance Program (MAP)
OVERVIEW
OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
Steering and Suspension
AIR RIDE SUSPENSION
AIR RIDE SUSPENSION - AIR SHOCKS AND AIR STRUTS
AIR RIDE SUSPENSION - AIR SPRING VALVES
AIR RIDE SUSPENSION - AIR SPRINGS
AIR RIDE SUSPENSION - COMPRESSORS
AIR RIDE SUSPENSION - HEIGHT SENSORS
AIR RIDE SUSPENSION - MODULES
AIR RIDE SUSPENSION - RELAYS (COMPRESSOR)
AIR RIDE SUSPENSION - SWITCHES (ON/OFF)
AIR RIDE SUSPENSION - TORSION SPRINGS (COUNTER BALANCING)
AIR RIDE SUSPENSION - TUBING
AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WIRING HARNESSES
BALL JOINTS
BUSHINGS
CENTER LINKS
CONTROL ARM SHAFTS
CONTROL ARMS
DRAG LINKS
ELECTRONIC RIDE CONTROL SHOCKS AND STRUTS
IDLER ARMS
KING PINS
PITMAN ARMS
POWER STEERING HOSES
POWER STEERING (HYDRAULIC) PUMPS
RADIUS ARMS
RELAY RODS
SHOCK ABSORBERS, STRUT CARTRIDGES AND STRUT ASSEMBLIES
SPINDLES
SPRINGS - COIL, LEAF AND TORSION BAR
STEEL POWER STEERING LINES
STEERING ARMS
STEERING DAMPERS
STEERING GEARS (EXCEPT RACK AND PINION)
STEERING GEARS - RACK AND PINION
STEERING KNUCKLES
STRIKE OUT BUMPERS
STRUT RODS
STRUT UPPER BEARING PLATE ASSEMBLIES
SWAY BAR LINKS
SWAY BARS

AIR RIDE SUSPENSION - COMPRESSORS
AIR RIDE SUSPENSION - COMPRESSOR INSPECTION








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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A ............ Require replacement.
Connector loose ......... A .. Require repair or replacement.
Does not build pressure . A .......... ( 1) Further inspection
required.
Excessive run time ...... B .......... ( 2) Further inspection
required.
Inoperative ............. A ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
( 1) - If failure to build pressure is traced to the
compressor, require replacement.
( 2) - If excessive run time is traced to the compressor,
require replacement.









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AIR RIDE SUSPENSION - HEIGHT SENSORS
AIR RIDE SUSPENSION - HEIGHT SENSOR INSPECTION








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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
corroded, affecting
structural integrity .... A .......... Require replacement of
corroded part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware

threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Dust boot missing ....... 2 ........ (1) Suggest replacement.
Dust boot split ......... 2 ........ ( 1) Suggest replacement.
Dust boot torn .......... 2 ........ ( 1) Suggest replacement.
Housing cracked ......... A ............ Require replacement.
Lead routing incorrect .. B .. Require rerouting according to
vehicle manufacturer's
specifications.
Loose ................... B ... Require adjustment to vehicle
manufacturer's specifications.
Missing ................. C ............ Require replacement.
Output signal incorrect . A .. Require repair or replacement.
Wire lead damaged ....... A .. Require repair or replacement.
( 1) - This condition can lead to damage of the sliding magnet,
which, in turn, causes premature sensor failure.









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AIR RIDE SUSPENSION - MODULES
AIR RIDE SUSPENSION - MODULE INSPECTION








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Condition Code Procedure
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Housing cracked ......... 2 .. Suggest repair or replacement.
Inoperative ............. A ............ Require replacement.
Missing ................. C ............ Require replacement.









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AIR RIDE SUSPENSION - RELAYS (COMPRESSOR)
AIR RIDE SUSPENSION - RELAY (COMPRESSOR) INSPECTION








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Condition Code Procedure
Housing cracked ......... 2 ........ ( 1) Suggest replacement.
Intermittent ............ A ............ Require replacement.
Missing ................. C ............ Require replacement.
Output signal incorrect . A ............ Require replacement.
( 1) - If moisture enters the relay, it can reduce life
expectancy or impair function.









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AIR RIDE SUSPENSION - SWITCHES (ON/OFF)

\003
* S U SPEN SIO N U NIF O RM IN SPEC TIO N G UID ELIN ES *

1 988 J e ep C hero ke e
GENERAL INFORMATION
Steering, Suspension, Wheel Alignment, Wheels and Tires
Motorist Assurance Program
Standards For Automotive Repair
All Makes and Models
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
CONTENTS
Motorist Assurance Program (MAP)
OVERVIEW
OVERVIEW OF SERVICE REQUIREMENTS & SUGGESTIONS
Steering and Suspension
AIR RIDE SUSPENSION
AIR RIDE SUSPENSION - AIR SHOCKS AND AIR STRUTS
AIR RIDE SUSPENSION - AIR SPRING VALVES
AIR RIDE SUSPENSION - AIR SPRINGS
AIR RIDE SUSPENSION - COMPRESSORS
AIR RIDE SUSPENSION - HEIGHT SENSORS
AIR RIDE SUSPENSION - MODULES
AIR RIDE SUSPENSION - RELAYS (COMPRESSOR)
AIR RIDE SUSPENSION - SWITCHES (ON/OFF)
AIR RIDE SUSPENSION - TORSION SPRINGS (COUNTER BALANCING)
AIR RIDE SUSPENSION - TUBING
AIR RIDE SUSPENSION - WARNING LAMPS
AIR RIDE SUSPENSION - WIRING HARNESSES
BALL JOINTS
BUSHINGS
CENTER LINKS
CONTROL ARM SHAFTS
CONTROL ARMS
DRAG LINKS
ELECTRONIC RIDE CONTROL SHOCKS AND STRUTS
IDLER ARMS
KING PINS
PITMAN ARMS
POWER STEERING HOSES
POWER STEERING (HYDRAULIC) PUMPS
RADIUS ARMS
RELAY RODS
SHOCK ABSORBERS, STRUT CARTRIDGES AND STRUT ASSEMBLIES
SPINDLES
SPRINGS - COIL, LEAF AND TORSION BAR
STEEL POWER STEERING LINES
STEERING ARMS
STEERING DAMPERS
STEERING GEARS (EXCEPT RACK AND PINION)
STEERING GEARS - RACK AND PINION
STEERING KNUCKLES
STRIKE OUT BUMPERS
STRUT RODS
STRUT UPPER BEARING PLATE ASSEMBLIES
SWAY BAR LINKS
SWAY BARS

AIR RIDE SUSPENSION - COMPRESSORS
AIR RIDE SUSPENSION - COMPRESSOR INSPECTION








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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware
threads damaged ........ A ... Require repair or replacement
of part with damaged threads.
Attaching hardware
threads stripped
(threads missing) ...... A ..... Require replacement of part
with stripped threads.
Connector bent .......... A .. Require repair or replacement.
Connector broken ........ A ............ Require replacement.
Connector loose ......... A .. Require repair or replacement.
Does not build pressure . A .......... ( 1) Further inspection
required.
Excessive run time ...... B .......... ( 2) Further inspection
required.
Inoperative ............. A ............ Require replacement.
Leaking ................. A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
( 1) - If failure to build pressure is traced to the
compressor, require replacement.
( 2) - If excessive run time is traced to the compressor,
require replacement.









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AIR RIDE SUSPENSION - HEIGHT SENSORS
AIR RIDE SUSPENSION - HEIGHT SENSOR INSPECTION








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Condition Code Procedure
Attaching hardware bent . B ... Require repair or replacement
of bent part.
Attaching hardware
broken ................. A ... Require replacement of broken
part.
Attaching hardware
corroded, affecting
structural integrity .... A .......... Require replacement of
corroded part.
Attaching hardware
loose .................. A ... Require repair or replacement
of loose part.
Attaching hardware
missing ................ C .. Require replacement of missing
part.
Attaching hardware