1988 JEEP CHEROKEE engine

fuel reserve service schedule odometer airbag disable fuse box diagram maintenance schedule

Page 84 of 1378

JEEP CHEROKEE 1988 Service Repair Manual ELECTRONIC CONTROL UNIT (ECU)
Removal & Installation
Information not available from manufacturer.
COOLANT TEMPERATURE SENSOR (CTS)
Removal & Installatio

ELECTRONIC CONTROL UNIT (ECU)
Removal & Installation
Information not available from manufacturer.
COOLANT TEMPERATURE SENSOR (CTS)
Removal & Installation
Drain cooling system. Remove air cleaner assembly. Disconnect
electrical connector and remove sensor from block. To install, reverse
removal procedure. Refill cooling system.
OXYGEN (O2) SENSOR
Removal & Installation
Raise and support vehicle. Disconnect electrical connector
from sensor. Remove sensor from exhaust manifold. Install and tighten
sensor to 35 ft. lbs. (47 N.m). Reconnect electrical connector. Lower
vehicle.
THROTTLE POSITION SENSOR (TPS)
Removal
Disconnect electrical connector from TPS. Bend lock tabs away
from retaining screws and remove screws. Remove TPS.
Installation
With throttle valve in normal closed position, install TPS.
Install TPS retaining screws. Perform OUTPUT CHECK.
NOTE: Throttle position sensor is nonadjustable. Only output
voltage can be monitored.
Output Check (Manual Transmission Only)
1) Connect negative lead of digital voltmeter to terminal "B"
and positive lead to terminal "A" of TPS connector. Do not disconnect
electrical connector. Insert leads through back of connector. It may
be necessary to remove throttle body from vehicle to gain access to
connector.
2) Turn ignition on, engine off. With throttle closed and
resting against idle stop, input voltage should be about 5 volts. Move
positive lead from terminal "B" to terminal "C" and read voltage
output. Output voltage should be about 0.8 volt with throttle closed
and resting against idle stop.
3) If voltage is not as specified, loosen lower retaining
screw and pivot sensor for large adjustments. Loosen upper retaining
screw and pivot sensor for small adjustments. Adjust sensor so output
voltage reading equals 16 percent of input voltage. If voltage
specifications cannot be obtained, replace sensor. Remove voltmeter.
Tighten screws and bend retaining tabs into position.
ALL OTHER SENSORS, SOLENOIDS & SWITCHES
Removal & Installation
Removal of sensors, switches, and solenoids is accomplished
by disconnecting the electrical and/or vacuum connectors and removing
or detaching the component. To install, reverse removal procedure.
TESTING
NOTE: Refer to Figs. 8-10 for Testing information.

Page 88 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Fig. 11: Comanche Engine Control System Wiring Diagram

Page 89 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Fig. 12: Cherokee Engine Control System Wiring Diagram

Page 91 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual �\ \ \ \ \ \ \ ABBREVIATION DEFINITION$

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ABBREVIATION DEFINITION

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B/P Backpressure

BAC By-Pass Air Control

BAP Barometric Absolute Pressure Sensor

BARO Barometric

BBDC Before Bottom Dead Center

BCM Body Control Module

BDC Bottom Dead Center

BHP Brake Horsepower

BLK Black

BLU Blue

BMAP Barometric & Manifold Absolute Pressure Sensor

BOO Brake On-Off Switch

BP Barometric Pressure sensor

BPS Barometric Pressure Sensor

BPT Backpressure Transducer

BRN Brown

BTDC Before Top Dead Center

BTU British Thermal Unit

BVSV Bimetallic Vacuum Switching Valve

Baro. Barometric

Batt. Battery

Bbl. Barrel (Example: 4-Bbl.)

Blst. Ballast

Blwr. Blower

Brkr. Breaker

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"C" ABBREVIATION TABLE
"C" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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C Celsius (Degrees)

C(3) I Computer Controlled Coil Ignition

C(4) Computer Controlled Catalytic Converter

CANP Canister Purge solenoid

CARB California Air Resources Board

CAT Catalytic Converter

CB Circuit Breaker

CBD Closed Bowl Distributor

CBVV Carburetor Bowl Vent Valve

cc Cubic Centimeter

CCC Computer Command Control

CCD Computer Controlled Dwell

CCM Central Control Module

CCO Converter Clutch Override

CCOT Cycling Clutch Orifice Tube

CCW Counterclockwise

CDI Capacitor Discharge Ignition

CEC Computerized Engine Control

CFI Central Fuel Injection

CID Cubic Inch Displacement

CID Cylinder Identification sensor

CIS Continuous Injection System

CIS-E Continuous Injection System-Electronic

CKT Circuit

CLR Clear

CNG Compressed Natural Gas

Page 93 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \ \b\ \ \ \ \ \ EAC Electric Assist Choke$

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EAC Electric Assist Choke

EACV Electric Air Control Valve

EBCM Electronic Brake Control Module

ECA Electronic Control Assembly

ECAT Electronically Controlled Automatic Transaxle

ECM Electronic Control Module

ECT Engine Coolant Temperature Sensor

ECU Electronic Control Unit or Engine Control Unit

EDF Electric Drive Fan relay assembly

EDIS Electronic Distributorless Ignition System

EEC Electronic Engine Control

EECS Evaporative Emission Control System

EEPROM Electronically Erasable PROM

EFE Early Fuel Evaporation

EFI Electronic Fuel Injection

EGO Exhaust Gas Oxygen sensor (see HEGO)

EGR Exhaust Gas Recirculation system

EGRC EGR Control solenoid or system

EGRV EGR Vent solenoid or system

EMR Emission Maintenance Reminder Module

ESA Electronic Spark Advance

ESC Electronic Spark Control

EST Electronic Spark Timing

ETR Emergency Tensioning Retractor

EVAP Fuel Evaporative System

EVIC Electronic Vehicle Information Center

EVO Electronic Variable Orifice

EVP EGR Valve Position Sensor

EVR EGR Valve Regulator

EVRV Electronic Vacuum Regulator Valve

Elect. Electronic

Eng. Engine

Evap. Evaporative

Exc. Except

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"F" ABBREVIATION TABLE
"F" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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F Fahrenheit (Degrees)

F/B Fuse Block

FBC Feedback Carburetor

FI Fuel Injector or Fuel Injection

FICD Fast Idle Control Device

FIPL Fuel Injector Pump Lever

FP Fuel Pump

FPM Fuel Pump Monitor

FPR-VSV Fuel Pressure Regulator Vacuum Switching Valve

FWD Front Wheel Drive

Fed. Federal

Ft. Lbs. Foot Pounds

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"G" ABBREVIATION TABLE
"G" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

Page 95 of 1378

JEEP CHEROKEE 1988 Service Repair Manual Ign. Ignition

In. Inches

Inj. Injector

Ign. Ignition

In. Inches

Inj. Injector

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"J" ABBREVIATION TABLE
"J" ABBREVIATION TABLE\
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J/B Junction Block

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"K" ABBREVIATION TABLE
"K" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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k/ohms 1000 ohms (kilo as in k/ohms)

kg Kilograms (weight)

kg/cm Kilograms Per Square Centimeter

KAM Keep Alive Memory

KAPWR Keep Alive Power

KM/H Kilometers Per Hour

KOEO Key On Engine Off

KOER Key On Engine Running

KS Knock Sensor

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"L" ABBREVIATION TABLE
"L" ABBREVIATION TABLE\
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L Liter(s)

L/D Light Duty

LCD Liquid Crystal Display

LED Light Emitting Diode

LH Left Hand

LOS Limited Operation Strategy

LT BLU Light Blue

LT GRN Light Green

LUS Lock-Up Solenoid

Lbs. Pounds

Lt(s). Light(s)

Lugg. Luggage

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"M" ABBREVIATION TABLE
"M" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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mA Milliamps

mV Millivolts

mfd. Microfarads

Page 98 of 1378

JEEP CHEROKEE 1988 Service Repair Manual RVB Rear Vacuum Break

RWAL Rear Wheel Anti-Lock Brake

RWD Rear Wheel Drive

RVB Rear Vacuum Break

RWAL Rear Wheel Anti-Lock Brake

RWD Rear Wheel Drive

Recirc. Recirculate or Recirculation

Reg. Regulator

Rly. Relay

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"S" ABBREVIATION TABLE
"S" ABBREVIATION TABLE\
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SAW Spark Angle Word

SBC Single Bed Converter

SBEC Single Board Engine Controller

SC Super Charged

SCC Spark Control Computer

SCS Air Suction Control Solenoid

SDM Supplemental Restraint System Diagnostic Module

SDU SRS Diagnostic Unit

SEN Sensor

SES Service Engine Soon

SFI Sequential (Port) Fuel Injection

SIG RTN Signal Return circuit

SIL Shift Indicator Light

SIR Supplemental Inflatable Restraint

SMEC Single Module Engine Controller

SOHC Single Overhead Cam

SOL or Sol. Solenoid

SPFI Sequential Port Fuel Injection

SPK Spark Control

SPOUT Spark Output Signal

SRS Supplemental Restraint System (Air Bag)

SS 3/4-4/3 Shift Solenoid circuit

SSI Solid State Ignition

STAR Self-Test Automatic Readout

STI Self Test Input circuit

STO Self-Test Output

SUB-O2 Sub Oxygen Sensor

Sen. or Sens. Sensor

Sol. Solenoid

Sprchg. Supercharger

Strg. Steering

Susp. Suspension

Sw. Switch

Sys. System

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"T" ABBREVIATION TABLE
"T" ABBREVIATION TABLE\
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T.V. Throttle Valve

TAB Thermactor Air By-Pass

TAC Thermostatic Air Cleaner

TAD Thermactor Air Diverter

TAN Tan

TBI Throttle Body Injection

Page 101 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \003 A/C C O M PR ESSO R O IL C HEC KIN G 1988 J e ep C hero ke e A/C General Servicing COMPRESSOR OIL CHECK * PLEASE READ THIS FIRST * CAUTION: When discharging ai$

\003
A/C C O M PR ESSO R O IL C HEC KIN G

1988 J e ep C hero ke e
A/C General Servicing
COMPRESSOR OIL CHECK
* PLEASE READ THIS FIRST *
CAUTION: When discharging air conditioning system, use only approved
refrigerant recovery/recycling equipment. Make every attempt
to avoid discharging refrigerant into the atmosphere.
ISOLATING COMPRESSOR - GRAND WAGONEER ONLY
1) Connect service gauge set to the compressor service valves
and open compressor valves slightly (turn clockwise). Start engine and\
operate air conditioning. Slowly turn compressor suction valve
clockwise toward closed (front-seated) position.
2) When suction pressure is reduced to zero or less, turn off
engine and compressor and quickly turn suction valve stem in to full
front-seated position. Suction pressure should be slightly above zero.
Turn discharge valve into front-seated position.
3) To check oil lever, slowly open crankcase plug to relieve
any remaining pressure. After oil level is correct, cap service gauge
parts on both valves. Back-seat suction service valve to allow
refrigerant to enter compressor. Open discharge valve halfway.
4) Loosen discharge service valve cap, allowing refrigerant
pressure to force air out of compressor. Back-seat service valve and
tighten cap. Compressor is now ready for operation.
REFRIGERANT OIL
Only new, pure, moisture-free refrigerant oil should be used
in the air conditioning system. This oil is highly refined and
dehydrated to a point where moisture content is less than 10 parts per
million. The oil container must be tightly closed at all times when
not in use, or moisture will be absorbed from the air and introduced
into the refrigeration system.
DISCHARGING SYSTEM
CAUTION: When discharging air conditioning system, use only approved
refrigerant recovery/recycling equipment. Make every attempt
to avoid discharging refrigerant into the atmosphere.
If compressor has stem-type service valves, it can be
isolated and removed without discharging entire system. Otherwise,
discharge system completely using approved refrigerant
recovery/recycling equipment before loosening any fittings.
DISCONNECTING LINES & FITTINGS
After system is discharged, carefully clean area around all
fittings to be opened. Always use 2 wrenches when tightening or
loosening fittings to avoid twisting or distorting lines. Cap or plug
all openings as soon as lines are removed. Do not remove caps until
immediately before connections are made. This will keep entry of air
and moisture to a minimum, reducing the chance of damage to
components.

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