light JEEP CHEROKEE 1988 Service Owner's Manual
[x] Cancel search | Manufacturer: JEEP, Model Year: 1988, Model line: CHEROKEE, Model: JEEP CHEROKEE 1988Pages: 1378, PDF Size: 19.9 MB
Page 188 of 1378
or threaded studs. Observe reading and reverse test lead connections.
See Fig. 5 .
2) If both readings are the same, replace rectifier bridge. A
good bridge will give a high and low reading. Retest all terminals (6
tests with insulated heat sink).
3) Connect test leads to insulated heat sink and one edge of
the 3 terminals. Observe reading and reverse connections. Repeat test
on all terminals (6 tests with insulated heat sink).
4) When all 12 tests have been made, testing is complete. DO
NOT use high voltage light to check bridge. DO NOT replace diode trio
or rectifier bridge unless at least one pair of readings is the same
(with leads reversed).
Fig. 5: Bench Testing Rectifier Bridge
OVERHAUL
NOTE: There are no overhaul procedures for CS130 alternators.
INSPECTION
Wash all metal parts except bearings, stator and rotor.
Inspect rotor slip rings. They may be cleaned with 400 grit or finer
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how fast accelerator is depressed.
5) After throttle position is checked, technician will be
instructed to drive the vehicle. The DRB-II will indicate if a
requested action is seen by the TCM. If technician is requested to
perform a particular operation and TCM does not acknowledge the
action, press ENTER key to continue testing.
6) The TCM will instruct technician to accelerate vehicle at
light throttle to ensure transmission shifts through all gears,
indicating proper valve body solenoid operation.
7) During road test, ensure vehicle can be accelerated slowly
and evenly to allow transmission to enter all gear ranges without
downshifting or braking. If a failure is sensed, a diagnostic trouble
code will be displayed on DRB-II.
NOTE: If TCM senses a failure, control logic activates a specified
valve body solenoid to obtain a certain gear depending on
failure. Because transmission diagnostic trouble codes are
displayed one at a time, multiple diagnostic trouble codes
must be identified by retesting transmission.
STATE DISPLAY MODE
NOTE: STATE DISPLAY mode must be selected from AW4 MENU. See
ENTERING AW4 MENU under RETRIEVING DIAGNOSTIC TROUBLE CODES .
Select 3) STATE DISPLAY on DRB-II.
Module Information
When selecting module information option, the TCM version
will be indicated by a 2-digit number. Information can be used to
verify proper TCM application.
Sensor
1) When selecting sensor option, TPS and RPM indications will
be shown. The TPS indicator will display a 7 segment bar graph,
indicating TPS position and throttle plate angle.
2) A properly operating TPS should indicate 7 segments
through full throttle travel. The RPM indicator will display
transmission output shaft revolutions per minute.
Brake Switch Or Input/Output
Display indicates brake switch status, indicating whether
brake pedal is applied or released. Display also indicates shift lever
position, whether a valve body solenoid is on or off and present
transmission operating gear.
DRB-II PROBLEMS & ERROR MESSAGES
CARTRIDGE ERROR
1) If CARTRIDGE ERROR message is displayed, disconnect DRB-II
from transmission diagnostic connector. DO NOT touch keys on DRB-II
keypad. Reconnect DRB-II to transmission diagnostic connector and note
display.
2) If CARTRIDGE ERROR message is displayed, replace DRB-II
cartridge and proceed with diagnostics. If KEYPAD TEST FAILURE message
is displayed, replace DRB-II and proceed with diagnostics.
HIGH BATTERY
If HIGH BATTERY message is displayed, use external voltmeter
to check battery voltage at battery terminals. If battery voltage is
11.7-13.0 volts, replace DRB-II. If battery voltage is not 11.7-13.0
Page 266 of 1378
used with 2.5.L
The DRB-II has determined that the wrong Transmission Control
Unit (TCU) has been installed in the vehicle. There are two
transmission control units available for the Jeep AW4 transmission.
One is for the 4-cylinder 2.5L engine and the other is for the 6-
cylinder 4.0L engine.
1) using the DRB-II, read MODULE INFO. See HELP 1 for
assistance.
2) Determine what vehicle should be in the vehicle.
* 2.5L Engine: TCU 02 (Used in earlier years only)
* 4.0L Engine: TCU 01 (1993-94)
3) If the wrong transmission control unit is installed, the
vehicle shift points will be slightly different (the 2.5L engine TCU
has higher shift points).
TEST 10A - TESTING FOR INTERMITTENT SPEED SENSOR
NOTE: Perform TEST 1A - VERIFICATION OF THE COMPLAINT
before proceeding.
Fig. 115: Test 10A - Flow Chart (1 of 2)
Fig. 116: Test 10A - Schematic (Cherokee)
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Installation
1) Install brake switch in retainer. Reconnect brake switch
electrical connector.
2) To check brake switch adjustment, slightly depress brake
pedal and note operation of brake switch plunger. Brake switch plunger
should fully extend when brake pedal free play is taken up and brake
application begins.
3) Clearance between brake switch plunger and brake pedal
should be approximately 1/8". If clearance is not within
specification, pull brake pedal rearward as far as possible.
4) Brake pedal should contact brake switch plunger, pushing
brake switch backward in retainer to provide proper adjustment. Ensure
brake lights operate.
5) Recheck clearance between brake switch plunger and brake
pedal with brake pedal depressed and free play taken up. Reinstall
lower steering column cover or trim panels.
NEUTRAL SAFETY SWITCH
NOTE: Neutral safety switch may be referred to as park/neutral or
gear select switch.
Removal
1) Apply parking brake. Raise and support vehicle. Disconnect
electrical connector at neutral safety switch. Pry lock washer tabs
away from retaining nut. See Fig. 126.
2) Remove retaining nut, lock washer and adjusting bolt. See
Fig. 126 . Remove neutral safety switch from manual valve shaft.
Installation
1) Disconnect shift control rod from transmission shift
lever. Rotate transmission shift lever fully rearward and then forward
2 detents to Neutral position.
2) Install neutral safety switch on manual valve shaft.
Install adjusting bolt but DO NOT tighten at this time.
3) Install lock washer and retaining nut. Tighten retaining
nut to specification. See TORQUE SPECIFICATIONS. DO NOT bend over lock
washer tabs at this time.
4) Ensure transmission is still in Neutral. Rotate neutral
safety switch and align neutral standard line with vertical groove on
manual valve shaft. See Fig. 126.
5) Tighten the adjusting bolt to specification. Refer to the
TORQUE SPECIFICATIONS table. Bend lock washer tabs over. Reconnect
shift control rod and electrical connector. Ensure vehicle starts in
Park and Neutral only.
Fig. 126: Installing Neutral Safety Switch
Courtesy of Chrysler Corp.
SPEED SENSOR
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All Models ............................... 15-20 (1.1-1.4) \
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MANUAL BLEEDING
NOTE: When bleeding disc brakes, air may tend to cling to caliper
walls. Lightly tap caliper, while bleeding, to aid in
removal of air.
1) Fill master cylinder. Install bleeder hose to first
bleeder valve to be serviced. See BLEEDING SEQUENCE table. Submerge
other end of hose in clean glass jar partially filled with clean brake
fluid. See Fig. 4.
2) Open bleeder valve 3/4-1 turn. Depress brake pedal slowly
through full travel. Close bleeder valve and release pedal. Repeat
procedure until flow of fluid shows no signs of air bubbles.
NOTE: When bleeding brake system manually, ensure bleeder valve is
closed when brake pedal is released.
Fig. 4: Wheel Cylinder Bleeding Procedure
Courtesy of American Motors/Jeep Corp.
BLEEDING SEQUENCE
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\003
* B RAK E S YSTE M U NIF O RM IN SPEC TIO N G UID ELIN ES *
1 988 J e ep C hero ke e
GENERAL INFORMATION
Brake Systems - Motorist Assurance Program
Standards For Automotive Repair
All Makes & Models
CONTENTS
OVERVIEW OF MOTORIST ASSURANCE PROGRAM
OVERVIEW OF SERVICE REQUIREMENTS AND SUGGESTIONS
ACCELEROMETERS (G SENSOR OR LATERAL)
ACCUMULATORS
ANCHOR PINS
ANTI-LOCK BRAKE SYSTEMS
BACKING PLATES
BRAKE FLUID
BRAKE FRICTION MATERIAL
BRAKE PADS
BRAKE PEDALS
BRAKE SHOES
BRAKE SHOE HARDWARE
BRAKE STOPLIGHT SWITCHES
BULB SOCKETS
BULBS AND LEDS
CALIPER HARDWARE
CALIPERS
CONTROLLERS
DIGITAL RATIO AXLE CONTROLLERS AND BUFFERS (DRAC AND DRAB)
DISABLE SWITCHES
DRUMS
ELECTRICAL PUMPS AND MOTORS
ELECTRONIC CONTROLLERS
FLUID
FLUID LEVEL SENSOR SWITCHES
FOUR WHEEL DRIVE SWITCHES
FRICTION MATERIAL
G SENSORS
HOSES
HYDRAULIC MODULATORS
HYDRO-BOOSTERS
HYDRO-ELECTRIC BOOSTERS (POWERMASTER)
IGNITION DISABLE SWITCHES
LATERAL ACCELERATION SWITCHES
LEDS
LENSES
MASTER CYLINDERS
MODULATORS
MOTORS
PARKING BRAKE SWITCHES
PARKING BRAKE SYSTEMS
PADS
PEDAL TRAVEL SWITCHES
PEDALS
POWERMASTER
PUMPS
PRESSURE DIFFERENTIAL SWITCHES
PRESSURE SWITCHES
RELAYS
ROTORS
SELF-ADJUSTING SYSTEMS
Page 283 of 1378
SHOE HARDWARE
SHOES
SOCKETS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
STEEL BRAKE LINES
STOPLIGHT SWITCHES
SWITCHES
TIRES
TOOTHED RINGS (TONE WHEEL)
VACUUM BOOSTERS
VACUUM HOSES
VALVES
WHEEL ATTACHING HARDWARE
WHEEL BEARINGS, RACES AND SEALS
WHEEL CYLINDERS
WIRING HARNESSES
INTRODUCTION TO MOTORIST ASSURANCE PROGRAM (MAP)
OVERVIEW OF MOTORIST ASSURANCE PROGRAM
The Motorist Assurance Program is the consumer outreach
effort of the Automotive Maintenance and Repair Association, Inc.
(AMRA). Participation in the Motorist Assurance Program is drawn from
retailers, suppliers, independent repair facilities, vehicle
manufacturers and industry associations.
Our organization's mission is to strengthen the relationship
between the consumer and the auto repair industry. We produce
materials that give motorists the information and encouragement to
take greater responsibility for their vehicles-through proper,
manufacturer-recommended, maintenance. We encourage participating
service and repair shops (including franchisees and dealers) to adopt:\
1) a Pledge of Assurance to their Customers and
2) the Motorist Assurance Program Standards of Service.
All participating service providers have agreed to subscribe
to this Pledge and to adhere to the promulgated Standards of Service
demonstrating to their customers that they are serious about customer
satisfaction.
These Standards of Service require that an inspection of the
vehicle's (problem) system be made and the results communicated to the\
customer according to industry standards. Given that the industry did
not have such standards, the Motorist Assurance Program successfully
promulgated industry inspection communication standards in 1994-95 for
the following systems: Exhaust, Brakes, ABS, Steering and Suspension,
Engine Maintenance and Performance, HVAC, and Electrical Systems.
Further, revisions to all of these inspection communication standards
are continually re-published. In addition to these, standards for
Drive Train and Transmissions have recently been promulgated.
Participating shops utilize these Uniform Inspection & Communication
Standards as part of the inspection process and for communicating
their findings to their customers.
The Motorist Assurance Program continues to work
cooperatively and proactively with government agencies and consumer
groups toward solutions that both benefit the customer and are
mutually acceptable to both regulators and industry. We maintain the
belief that industry must retain control over how we conduct our
business, and we must be viewed as part of the solution and not part
of the problem. Meetings with state and other government officials
(and their representatives), concerned with auto repair and/or
consumer protection, are conducted. Feedback from these sessions is
brought back to the association, and the program adjusted as needed.
To assure auto repair customers recourse if they were not
Page 287 of 1378
NOTE: Electro-magnetic interference (EMI) may be caused by
incorrect installation of accessories or components. EMI can
result in improper system operation.
BACKING PLATES
BACKING PLATE INSPECTION \
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Condition Code Procedure
Anchor pin bent ......... B .. Require repair or replacement.
Anchor pin broken ....... A ............ Require replacement.
Anchor pin worn, affecting
structural integrity ... B ............ Require replacement.
Backing plate bent ...... B .. Require repair or replacement.
Backing plate broken .... A ............ Require replacement.
Backing plate cracked ... B .. Require repair or replacement.
Corroded, affecting
structural integrity .... A ............ Require replacement.
Loose ................... B .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Shoe lands worn ......... A .. Require repair or replacement.
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BRAKE FLUID
CAUTION: Most manufacturers prohibit the use of DOT 5 brake fluid
in a system equipped with ABS.
DOT 3, DOT 4, and DOT 5.1 brake fluids are clear or light
amber in color. DOT 5 brake fluid is violet in color. Correct fluid
required for the brake system is stamped on the master cylinder cover.
BRAKE FLUID INSPECTION
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Condition Code Procedure
Beyond service interval . 3 .. Suggest flushing and refilling
with correct fluid.
Brake fluid type
incorrect .............. B .. Require flushing and refilling
with correct fluid.
Contaminated, for example,
fluid other than brake
fluid present .......... A or B ....... ( 1) Require service.
Hydraulic component ..... 3 .. Suggest flushing and refilling
overhaul or replacement with correct fluid.
Rubber master cylinder
cover gasket distorted
and gummy .............. A .......... ( 2) Require replacement
of gasket.
( 1) - If a fluid other than brake fluid is present in the brake
system which DOES affect the rubber parts, the required
service is to:
* Remove all components having rubber parts from the
system.
* Flush lines with denatured alcohol or brake cleaner
* Repair or replace all components having rubber parts
* Flush and fill with correct brake fluid. (Code A)
If a fluid other than brake fluid is present in the brake
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system which DOES NOT affect the rubber parts, the required
service is to flush and fill with the correct brake fluid.
(Code B)
( 2) - This condition may indicate contaminated brake fluid.
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BRAKE FRICTION MATERIAL
See FRICTION MATERIAL .
BRAKE PADS
See FRICTION MATERIAL .
BRAKE PEDALS
BRAKE PEDAL INSPECTION \
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Condition Code Procedure
Bent, affecting
performance ............ A .. Require repair or replacement.
Broken .................. A .. Require repair or replacement.
Pedal pad missing ....... C .... Require replacement of pedal
pad.
Pedal pad worn .......... 1 ............ Suggest replacement.
Pivot bushings worn,
affecting performance .. A .... Require replacement of pivot
bushings.
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BRAKE SHOES
See FRICTION MATERIAL .
BRAKE SHOE HARDWARE
See also SELF-ADJUSTING SYSTEMS .
BRAKE SHOE HARDWARE INSPECTION
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Condition Code Procedure
Broken .................. A ............ Require replacement.
Distorted ............... A ............ Require replacement.
Missing ................. C ............ Require replacement.
Surfaces rust-pitted .... 1 ............ Suggest replacement.
Worn, affecting
performance ............ A ............ Require replacement.
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BRAKE STOPLIGHT SWITCHES
BRAKE STOPLIGHT INSPECTION \
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Condition Code Procedure
Bent .................... B ............ Require replacement.
Broken .................. A ............ Require replacement.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Page 298 of 1378
Wear indicator device
(mechanical) contacts
rotor .................. .. ......... (6) Further inspection
required.
Worn close to minimum
specifications ......... 1 ........ ( 7) Suggest replacement.
Worn to, or below minimum
specifications ......... B ............ Require replacement.
( 1) - Identify and repair cause of contamination prior to
replacing friction material.
( 2) - When reconditioning or replacing drums or rotors,
replacement of friction material may be suggested
depending on the severity of the grooves or ridges.
( 3) - Some vehicles use pads that are tapered by design. Refer
to specific vehicle application. If not normal, require
replacement of pads and correction of cause.
( 4) - Uneven pad thickness is normal on some vehicles. Refer to
specific vehicle applications.
( 5) - The pad wear indicator light may come on due to other
electrical problems.
( 6) - Explain to the customer that the purpose of the wear
indicator is to alert him or her to check for friction
wear. Wear indicators may be bent or broken. Therefore,
the friction material must be measured. The need for
friction material replacement is determined based upon
the conditions stated in this section. Periodic inspection
is suggested.
( 7) - When the part appears to be close to the end of its useful
life, replacement may be suggested.
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G SENSORS
See ACCELEROMETERS .
HOSES
HOSE INSPECTION \
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............. A ... Require repair or replacement
of hardware.
Blistered ............... B ............ Require replacement.
Fitting threads damaged . A .. Require repair or replacement.
Fitting threads stripped
(threads missing) ...... A ............ Require replacement.
Incorrectly secured ..... B ................. Require repair.
Inner fabric
(webbing) cut .......... B ............ Require replacement.
Leaking ................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Outer covering is cracked
to the extent that
inner fabric of hose