1988 JEEP CHEROKEE door lock
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CO Carbon Monoxide
CO2 Carbon Dioxide
CONV Convertible
CP Canister Purge
CPA Connector Position Assurance
CPS Crank Position Sensor
CTS Coolant Temperature Sensor
CV Check Valve or Constant Velocity
CVC Constant Vacuum Control
CW Clockwise
CYL or Cyl. Cylinder
Calif. California
Carb. Carburetor
Chrg. Charging
Circ. Circuit
Cntrl. Control
Comp. Compressor or Compartment
Conn. Connector
Cont. Continued
Conv. Convertible or Converter
Cu. In. Cubic Inch
Cyl. Cylinder
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"D" ABBREVIATION TABLE
"D" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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"D" Drive
DBC Dual Bed Catalyst
DC Direct Current or Discharge
DDD Dual Diaphragm Distributor
DERM Diagnostic Energy Reserve Module
DFI Digital Fuel Injection
DIC Driver Information Center
DIS Direct Ignition System
DIS Distributorless Ignition System
DIST Distribution
DISTR Distributor
DK BLU Dark Blue
DK GRN Dark Green
DME Digital Motor Electronics (Motronic System)
DOHC Double Overhead Cam
DOT Department of Transportation
DP Dashpot
DRB-II Diagnostic Readout Box
DVOM Digital Volt/Ohm Meter (see VOM)
Def. Defogger or Defroster
Def. Defrost
Defog. Defogger
Diag. Diagnostic
Dist. Distributor or Distribution
Dr. Door
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"E" ABBREVIATION TABLE
"E" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
Page 118 of 1378
HEATER HOSES
HIGH PRESSURE RELIEF VALVES (HPRV)
IDLERS
IN-LINE FILTERS
METAL FITTINGS
METAL LINES
MIX AND AIR CONTROL DOORS (BLEND DOORS)
O-RINGS
ORIFICE TUBES
PILOT-OPERATED ABSOLUTES (POAS)
PLENUMS
PRESSURE CONTROL VALVES
PRESSURE SENSORS
PULLEYS
RADIATORS
RECEIVER-DRIERS
REFRIGERANT
REFRIGERANT OIL
RELAYS
SEALS
SERVICE PORTS
SPRING LOCK COUPLINGS
SUCTION THROTTLING VALVES (STVS)
SWITCHES (ELECTRICAL)
TENSIONERS
THERMISTORS AND PRESSURE SENSORS
THERMOSTATS AND HOUSINGS
VACUUM HOSES AND TUBES
VACUUM RESERVOIRS
VACUUM TUBES
VALVES IN RECEIVER (VIRS)
WATER PUMPS (ELECTRIC AUXILIARY)
WIRING HARNESSES AND CONNECTORS
MOTORIST ASSURANCE PROGRAM (MAP)
OVERVIEW
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
Page 158 of 1378
2000 ....................... 27.82 ........................... 2.1
3000 ....................... 26.82 ........................... 3.1
4000 ....................... 25.82 ........................... 4.1
5000 ....................... 24.92 ........................... 5.0
6000 ....................... 23.92 ........................... 6.0
7000 ....................... 23.02 ........................... 6.9
8000 ....................... 22.22 ........................... 7.7
9000 ....................... 21.32 ........................... 8.6
10,000 ..................... 20.52 ........................... 9.4
(1) - Add correction shown to gauge readings
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OPERATIONAL TEST GAUGE READINGS
Normal System Operating Pressures (PSI) ( 1)
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Low Side High Side
Gauge Gauge
Application (Suct.) (Disc.\
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Jeep 1980-87
(Thermostatic Switch) ........ 5-24 ................... 208-250\
1988
(Accumulator Type) ........... 24-50 .................. 160-250\
( 1) - Pressure readings given are for a system in good operating
condition, at sea level and an ambient temperature of 80
F
(27C). \
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AIR CONDITIONING SYSTEM PERFORMANCE CHECK TABLE \
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PERFORM TESTS: SHOULD BE: IF: \
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Temperature Check Temperature Check is
* Switch to LOW
blower
* Close doors Too warm-Check control lever
* Check outlet 35-45
F (1.7-7.2C) operation, heater water valve,
temperature. cooling system and gauge
readings.
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Visual Check Visual Check Shows:
* Compressor Quiet, no leaks Noisy-Check belts, oil level,
seals, gaskets, reed valves.
* Condenser Free of Blocked-Clean off. Plugged-
obstructions Flush or replace.
* Receiver- Dry and warm to Frosty-Check for restriction,
Drier touch. replace desiccant.
* Sight Glass Clear or few Bubbly, foamy or streaks-
bubbles Check gauge readings.
* High Side Dry and warm to Frosty or very hot-Check for
touch. restriction or overcharge.
* Low Side Dry and cool to Frosty or warm-Check for
Lines touch. restriction, low charge or
bad valve.
Page 171 of 1378
* Switch to LOW
blower.
* Close doors. Too warm - Check control
lever operation, heater
water valve, cooling
system and gauge readings.
* Check outlet
temperature. 35-45
F (1.7-7.2 C)\
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Visual Check Visual Check Shows:
* Compressor Quiet, No Leaks Noisy - Check belts, oil
level, seals, gaskets,
reed valves.
* Condenser Free of Obstructions Blocked - Clean off.
Plugged - Flush or
replace.
* Receiver-Drier Dry and warm to Frosty - Check for re-
touch striction, replace
Desicant.
* Sight Glass Clear or few bubbles Bubbly, foamy or streaks -
Check gauge readings.
* High Side Lines Dry and warm to Frosty or very hot - Check
touch for restriction or
overcharge.
* Low Side Lines Dry and cool to Frosty or warm - Check for
touch restriction, low charge or
bad valve.
* Expansion Valve Dry Frosty - Check for moisture
or restriction. Check
sensing bulb.
* STV Dry and cool to Frosty or warm - Check
touch gauge readings for valve
malfunction.
* Evaporator Dry and cold to Freezing or warm - Check
touch expansion valve, STV or
thermo switch.
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Gauge Readings Gauge Readings are:
* High Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
* Low Side Gauge See Pressure Chart Above or below normal - See
A/C DIAGNOSIS.
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PRESSURE CHARTS
Page 179 of 1378
TESTING
VACUUM MOTOR & TEMPERATURE SENSOR
1) Remove air cleaner assembly from vehicle and allow to
cool to room temperature. Look through air cleaner duct and observe
position of air diverter valve. It should be fully open to outside
air.
2) Reinstall assembly on carburetor and connect hot air duct
and manifold vacuum hose. Start engine and observe position of air
valve in snorkel. It should be fully closed to outside air.
3) Move throttle lever rapidly to 1/2 to 3/4 opening and
release. Air diverter valve should open and then close again. Allow
engine to warm to operating temperature and observe position of air
valve in snorkel. It should be fully open to outside air.
4) If valve does not move to fully close off outside air at
83
F (28 C) or less with vacuum applied, check for binding of duct,
vacuum leaks in hose connections or disconnected vacuum motor. If
valve mechanism operates freely and no vacuum leaks are detected,
connect hose from intake manifold vacuum source directly to vacuum
motor.
5) If air valve now moves to close off outside air, replace
thermal sensor switch. If valve still does not move to close off
outside air, replace air cleaner assembly and vacuum motor assembly.
TRAP DOOR
1) With engine off, remove air cleaner and check position of
trap door. It should be closed.
2) Remove vacuum hose from intake manifold vacuum source and
apply an external vacuum source of approximately 2-4 in. Hg vacuum.
Trap door should open.
3) If door does not open, apply vacuum directly to vacuum
motor. If door does not open, check for binding and adjust as
necessary. If door swings freely, replace vacuum motor.
4) If door opens during step 3), check vacuum hose for
blockage, cracks or leaks. Correct as necessary and retest as
specified in step 2).
5) If hoses are not defective, remove reverse delay valve,
join vacuum hose and retest from step 2). If door opens, replace
reverse delay valve.
REVERSE DELAY VALVE
1) Connect external vacuum source to port on White side of
delay valve. Connect one end of 24" (610 mm) section of rubber hose
to vacuum gauge and other end to port on colored side of valve.
2) With a constant 10 in. Hg vacuum applied, note time
required for vacuum gauge pointer to move from 0-8 in. Hg.
Page 368 of 1378
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DO OR L O CKS - P O W ER
1988 J e ep C hero ke e
1988 Power Door Locks
JEEP
DESCRIPTION
Jeep vehicles with power door locks use a motor-actuated lock
system, controlled by rocker switches. Operation of switch assembly
controls the actuator motor.
Power door locks are protected by a 30-amp circuit breaker
located in the fuse block. Power door locks will not operate from
outside the vehicle.
TESTING
SWITCH
Using ohmmeter, test switches for continuity. Connect
ohmmeter across terminals as shown. See Fig. 1. Continuity should
exist between terminals in all positions.
Fig. 1: Checking Switch Continuity
Courtesy of Chrysler Motors.
ACTUATOR MOTOR
Connect ammeter to actuator motor terminals. Operate door
switch and note reading. Current draw should not exceed 8 amps at room
temperature. Actuator should complete full travel within one second.
Replace actuator motor if not within specification.
CIRCUIT BREAKER
1) Disconnect harness connector from fuse block. Using test
light, check fuse block harness connection for voltage. If there is no
battery voltage at connection, check for burnt fusible link in engine
compartment.
2) Check circuit breaker continuity if voltage exists. Using
ohmmeter, test circuit breaker for continuity. Replace circuit breaker
if no continuity exists.
3) If circuit breaker tests okay, check for battery voltage
at circuit breaker connection of fuse block with wiring harness
installed. If voltage exists at wiring harness but not at circuit
breaker connection, check fuse block for damage.
REMOVAL & INSTALLATION
Page 369 of 1378
DOOR LOCK SWITCH
Disconnect battery negative cable. Remove door trim panel.
Remove switch housing from inner door panel. Pry wiring retaining
clips upward while disconnecting wiring. Depress retainer clips
through holes in switch housing. Remove switch assembly. To install,
reverse removal procedure.
ACTUATOR MOTOR
1) Disconnect battery negative cable. Remove door trim panel.
Drill out actuator motor retaining rivets using a 1/4" drill bit.
2) Disconnect actuator rod from bellcrank. Disconnect wires
from actuator motor, and remove motor. To install, reverse removal
procedure, using new rivets.
Page 485 of 1378
B+ Latch Relay On center of right front
wheelwell.
Choke Relay On right front wheelwell.
Door Lock/Unlock Relays Under dash, behind right kick
panel.
Fog Light Relay Behind right headlight, on
wheelwell.