1988 JEEP CHEROKEE ignition

fuel type door lock check engine service reset bolt pattern fuse chart

Page 94 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \ \b\ \ \ \ \ \ g grams$

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g grams

GND or GRND Ground

GRN Green

GRY Gray

Ga. Gauge

Gals. gallons

Gov. Governor

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"H" ABBREVIATION TABLE
"H" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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H/D Heavy Duty

HAC High Altitude Compensation

HC Hydrocarbons

HEDF High Speed Electro Drive Fan relay or circuit

HEGO Heated Exhaust Gas Oxygen Sensor

HEGOG HEGO Ground circuit

HEI High Energy Ignition

HLDT Headlight

HO High Output

HP High Performance

HSC High Swirl Combustion

HSO High Specific Output

HTR Heater

HVAC Heating

Headlt. Headlight

Hg Mercury

Hgt. Height

Htr. Heater

Hz Hertz (Cycles Per Second)

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"I" ABBREVIATION TABLE
"I" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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I.D. Inside Diameter

IAC Idle Air Control

IACV Idle Air Control Valve

IC Integrated Circuit

ID Identification

IDM Ignition Diagnostic Monitor

IGN Ignition system or circuit

ILC Idle Load Compensator

In. Hg Inches of Mercury

INCH Lbs. Inch Pounds

INFL REST Inflatable Restraint

INJ Injector or Injection

IP Instrument Panel

IPC Instrument Panel Cluster

ISA Idle Speed Actuator

ISC Idle Speed Control

ISS Idle Stop Solenoid

ITS Idle Tracking Switch

IVSV Idle Vacuum Switching Valve

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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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 97 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual "P" ABBREVIATION TABLE "P" ABBREVIATION TABLE�\ \ \ \ \ \ \$

"P" ABBREVIATION TABLE
"P" ABBREVIATION TABLE\
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ABBREVIATION DEFINITION

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"P" Park

P/C Printed Circuit

P/N Park/Neutral

P/S Power Steering

PAV Pulse Air Valve

PC-SOL Purge Control Solenoid

PCM Powertrain Control Module

PCS Purge Control Solenoid

PCSDM Passenger Compartment Sensor/Diagnostic Module

PCV Positive Crankcase Ventilation

PFE Pressure Feedback EGR sensor or circuit

PFI Port Fuel Injection (see MA SEFI)

PGM-CARB Programmed Carburetor

PGM-FI Programmed Fuel Injection

PIP Profile Ignition Pickup

PNK Pink

PPL Purple

PRNDL Park Reverse Neutral Drive Low

PROM Programmable Read-Only Memory

psi Pounds Per Square Inch

PSPS Power Steering Pressure Switch

PTC Positive Temperature Coefficient

PTO Power Take-Off

PWR GND Power Ground circuit

Pkg. Package

Press. Pressure

Prog. Programmed or Programmable

Pts. Pints

Pwr. Power

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"Q" ABBREVIATION TABLE
"Q" ABBREVIATION TABLE\
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Qts. Quarts

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"R" ABBREVIATION TABLE
"R" ABBREVIATION TABLE\
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RABS Rear Anti-Lock Brake System

RAC Remote Accessory Control

RAM Random Access Memory

RAP Retained Accessory Power

RECIRC Recirculation

RED Red

RH Right Hand

ROM Read Only Memory

RPM Revolutions Per Minute

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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ABBREVIATION DEFINITION

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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 99 of 1378

JEEP CHEROKEE 1988 Service Repair Manual TCC Torque Converter Clutch

TCCS Toyota Computer Control System

TDC Top Dead Center

TCC Torque Converter Clutch

TCCS Toyota Computer Control System

TDC Top Dead Center

TDCL Total Diagnostic Communication Link

TFI Thick Film Ignition system

TGS Top Gear Switch (cancels SIL in top gear)

THERMAC Thermostatic Air Cleaner

THS Transmission Hydraulic Switch

TP/TPS Throttle Position Sensor

TPI Tuned Port Injection

TPS Throttle Position Sensor/Switch

TS Temperature Sensor

TSB Technical Service Bulletin

TTS Transmission Temperature Switch

TV Thermovalve

TWC Three-Way Catalyst

Temp. Temperature

Trans. Transaxle/Transmission

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"V" ABBREVIATION TABLE
"V" ABBREVIATION TABLE\
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V Valve

VAF Vane Air Flow sensor or circuit

VAPS Variable Assist Power Steering

VAT Vane Air Temperature

VATS Vehicle Anti-Theft System

VBATT Vehicle Battery Voltage

VCC Viscous Converter Clutch

VIN Vehicle Identification Number

VIO Violet

VLR Volt Loop Reserve

VM Vacuum Modulator

VM Vane Meter

VOM Volt-Ohmmeter (Analog)

VPWR Vehicle Power supply voltage (10-14 volts)

VREF Voltage Reference (ECA supplied reference voltage

VRV Vacuum Regulator Valve

VSC Vehicle Speed Control sensor or signal

VSS Vehicle Speed Sensor or signal

VSV Vacuum Switching Valve

Vac. Vacuum

Volt. Voltage

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"W" ABBREVIATION TABLE
"W" ABBREVIATION TABLE\
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W/ With

W/O Without

WAC WOT A/C Cut-off switch or circuit

WAC Wide Open Throttle A/C Switch

WHT White

WOT Wide Open Throttle

YEL Yellow

Page 183 of 1378

JEEP CHEROKEE 1988 Service Repair Manual be obtained. During high speeds "on" time may be 10 percent and "off"
time 90 percent. During low speeds with high electrical loads, "on"
time may be 90 percent and "off" time 10 percent.
SI

be obtained. During high speeds "on" time may be 10 percent and "off"
time 90 percent. During low speeds with high electrical loads, "on"
time may be 90 percent and "off" time 10 percent.
SI SERIES
A rectifier bridge, connected to stator windings, contains 6
diodes (3 positive and 3 negative) molded into an assembly. This
rectifier bridge changes stator AC voltage into DC voltage, which
appears at output terminal.
Alternator field current is supplied through a diode trio
which is also connected to stator windings. A capacitor is mounted to
end frame, protecting rectifier bridge and diodes from high voltage
and suppressing radio interference noise.
TROUBLE SHOOTING
NOTE: See the TROUBLE SHOOTING - BASIC PROCEDURES article
in the GENERAL TROUBLE SHOOTING section.
TESTING
PRELIMINARY INFORMATION
NOTE: Before making electrical checks, visually inspect all
terminals for clean, tight connections. Check alternator
mounting bolts and drive belt tension. Battery must be in
good condition to test charging system.
TESTING (ON-VEHICLE)
CS SERIES
Over/Undercharged Battery (W/ STandard Instruments)
1) If an overcharging condition is suspected, run engine at a
moderate speed. Connect a voltmeter across battery terminals. If
voltmeter indicates more than 16 volts, replace alternator.
2) If an undercharging condition is suspected, disconnect
2
wire connector from alternator. Turn ignition on with engine off.
Connect a voltmeter between terminal "L" in wiring harness and ground.
Record reading.
3) If terminal "I" is used, connect voltmeter between
terminal "I" and ground. Record reading. If voltmeter reads battery
voltage, circuits are okay. If voltmeter reads zero, this indicates an
open circuit between terminal checked and battery. Repair as
necessary.
Overcharged Battery (W/ Gauges)
If an overcharging condition is suspected, run engine at a
moderate speed. Connect a voltmeter across battery terminals. If
voltmeter indicates more than 16 volts, replace alternator.
Alternator Output Test (W/ Standard Instruments Or Gauges)
1) Run engine at moderate speed, all electrical accessories
off. Measure voltage across battery, if above 16 volts, replace
alternator.
2) Connect an ammeter in circuit at "BAT" terminal of
alternator. Turn on all available accessories. Connect a battery load
tester across battery. Operate engine at 2000 RPM and adjust battery
load tester as required to obtain maximum current output while

Page 184 of 1378

JEEP CHEROKEE 1988 Service Repair Manual maintaining 13 volts or more.
3) Output must be within 15 amps of rated output stamped on
alternator. If output is not within 15 amps of rated output, replace
alternator.
SI SERIES

maintaining 13 volts or more.
3) Output must be within 15 amps of rated output stamped on
alternator. If output is not within 15 amps of rated output, replace
alternator.
SI SERIES
Overcharged Or Undercharged Battery
1) If an overcharging condition is suspected, attach a
voltmeter across battery terminals. Run engine at a moderate speed
with all accessories off. If voltmeter reads 15.5 volts or more,
remove alternator for repair.
2) If an undercharging condition is suspected, turn ignition
on. Connect a voltmeter from alternator "BAT" terminal to ground.
Voltmeter should read 12 volts. Connect voltmeter between No. 1
terminal and ground. Voltmeter should read one volt or more.
3) Connect voltmeter between No. 2 terminal and ground.
Voltmeter should read 12 volts. A zero reading on any connection
indicates an open between connection and battery. Opens in the No. 2
lead may be between terminals at the crimp between harness wire and
terminal, or in wire.
Alternator Output Test
1) Connect an ammeter in circuit at "BAT" terminal of
alternator. Turn on all available accessories. Connect a carbon pile
across battery. Operate engine at 2000 RPM and adjust carbon pile as
required to obtain maximum current output.
2) Ampere output must be within 10 amps of rated output. If
output is not within 10 amps of rated output, ground field winding by
inserting a screwdriver into test hole. Repeat step 1).
3) If output is increases to within 10 amps of rated output
with field grounded, regulator is defective. If output remains below
10 amps of rated output, check field winding, diode trio, rectifier
bridge, and stator.
CAUTION: Tab is within 3/4" of casting surface. DO NOT force tool
beyond 1" into end frame. If test hole is not accessible,
proceed to BENCH TESTING.
BENCH TESTING
NOTE: There are no internal checks for CS series alternators.
SI SERIES
Rotor Field Winding Test
1) To check for grounds, attach ohmmeter leads to shaft and
slip ring (each ring in turn). If reading is not infinity, replace
rotor.
2) To test for open field, attach ohmmeter leads to each slip
ring. Resistance should measure about 2.4
2.8 ohms on 12SI series, or
1.72.1 ohms on 17SI series. If not, replace rotor.

Page 192 of 1378

$JEEP CHEROKEE 1988 Service Repair Manual \003 AN TI- L O CK B RAK E S A FE TY P R EC AU TIO NS 1988 J e ep C hero ke e GENERAL INFORMATION Anti-Lock Brake Safety Precautions * PLEASE READ THIS FIRST *$

\003
AN TI- L O CK B RAK E S A FE TY P R EC AU TIO NS

1988 J e ep C hero ke e
GENERAL INFORMATION
Anti-Lock Brake Safety Precautions
* PLEASE READ THIS FIRST *
This article is intended for general information purposes
only. This information may not apply to all makes and models. If
vehicle is equipped with Anti-Lock Brake System (ABS), refer to
appropriate ANTI-LOCK BRAKE SYSTEM article in the BRAKES section for
description, operation, depressurizing, testing, system bleeding,
trouble shooting and servicing of specific system.
WARNING: Failure to depressurize ABS could lead to physical injury.
ANTI-LOCK BRAKE SAFETY PRECAUTIONS
WARNING: Failure to depressurize ABS could lead to physical injury.
* NEVER open a bleeder valve or loosen a hydraulic line
while ABS is pressurized.
* NEVER disconnect or reconnect any electrical connectors
while ignition is on. Damage to ABS control unit may result.
* DO NOT attempt to bleed hyudarulic system without first
referring to the appropriate ANTI-LOCK BRAKE SYSTEM article
in the BRAKES section.
* Only use specially designed brake hoses/lines on ABS equipped
vehicles.
* DO NOT tap on speed sensor components (sensor, sensor rings).
Sensor rings must be pressed into hubs, NOT hammered into
hubs. Striking these components can cause demagnetization or
a loss of polarization, affecting the accuracy of the speed
signal returning to the ABS control unit.
* DO NOT mix tire sizes. Increasing the width, as long as tires
remain close to the original diameter, is acceptable. Rolling
diameter must be identical for all 4 tires. Some
manufacturers recommend tires of the same brand, style and
type. Failure to follow this precaution may cause inaccurate
wheel speed readings.
* DO NOT contaminate speed sensor components with grease. Only
use recommended coating, when system calls for an
anti-corrosion coating.
* When speed sensor components have been removed, ALWAYS check
sensor-to-ring air gaps when applicable. These specifications
can be found in each appropriate article.
* ONLY use rocommended brake fluids. DO NOT use silicone brake
fluids in an ABS equipped vehicle.
* When instlling transmittion devices (CB's, telephones, etc.)
on ABS equipped vehicles, DO NOT locate the antenna near the
ABS control unit (or any control unit).
* Disconnect all on-board computers, when using electric
welding equipment.
* DO NOT expose the ABS control unit to prolonged periods of
high heat (185
F/85C for 2 hours is generally considered a
maximum limit).

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