OBD port JEEP YJ 1995 Service And Repair Manual

USING ON-BOARD DIAGNOSTIC SYSTEM
GENERAL INFORMATION
The Powertrain Control Module (PCM) monitors
critical input and output circuits of the charging sys-
tem, making sure they are operational. A Diagnostic
Trouble Code (DTC) is assigned to each input and
output circuit monitored by the OBD system. Some
circuits are checked continuously and some are
checked only under certain conditions.
If the OBD system senses that a monitored circuit
is bad, it will put a DTC into electronic memory. The
DTC will stay in electronic memory as long as the
circuit continues to be bad. The PCM is programmed
to clear the memory after 50 engine starts, if the
problem does not occur again.
DIAGNOSTIC TROUBLE CODES
Diagnostic Trouble Codes (DTC) are two-digit num-
bers flashed on the malfunction indicator (Check En-
gine) lamp that identify which circuit is bad. A DTC
description can also be read using the DRB scan tool.
Refer to Group 14 - Fuel Systems for more informa-
tion.
A DTC does not identify which component in a cir-
cuit is bad. Thus, a DTC should be treated as a
symptom, not as the cause for the problem. In some
cases, because of the design of the diagnostic test
procedure, a DTC can be the reason for another DTCto be set. Therefore, it is important that the test pro-
cedures be followed in sequence, to understand what
caused a DTC to be set.
See Generator Diagnostic Trouble Code chart for
DTC's which apply to the charging system. Refer to
the Powertrain Diagnostic Procedures manual to di-
agnose an on-board diagnostic system trouble code.
RETRIEVING DIAGNOSTIC TROUBLE CODES
To start this function, cycle the ignition switch ON-
OFF-ON-OFF-ON within 5 seconds. This will cause
any DTC stored in the PCM memory to be displayed.
The malfunction indicator (Check Engine) lamp will
display a DTC by flashing on and off. There is a
short pause between flashes and a longer pause be-
tween digits. All DTC's displayed are two-digit num-
bers, with a four-second pause between codes.
An example of a DTC is as follows:
(1) Lamp on for 2 seconds, then turns off.
(2) Lamp flashes 4 times pauses and then flashes 1
time.
(3) Lamp pauses for 4 seconds, flashes 4 times,
pauses, then flashes 7 times.
The two DTC's are 41 and 47. Any number of
DTC's can be displayed, as long as they are in mem-
ory. The lamp will flash until all stored DTC's are
displayed (55 = end of test).
GENERATOR DIAGNOSTIC TROUBLE CODE
8A - 22 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICSJ

USING ON-BOARD DIAGNOSTIC SYSTEM
The Powertrain Control Module (PCM) monitors
critical input and output circuits of the speed control
system, making sure they are operational. A Diagnos-
tic Trouble Code (DTC) is assigned to each input and
output circuit monitored by the OBD system. Some
circuits are checked continuously and some are
checked only under certain conditions.
If the OBD system senses that a monitored circuit
is bad, it will put a DTC into electronic memory. The
DTC will stay in electronic memory as long as the
circuit continues to be bad. The PCM is programmed
to clear the memory after 50 engine starts, if the
problem does not occur again.
DIAGNOSTIC TROUBLE CODES
Diagnostic Trouble Codes (DTC) are two-digit num-
bers flashed on the malfunction indicator (Check En-
gine) lamp that identify which circuit is bad. A DTC
description can also be read using the DRB scan tool.
Refer to Group 14 - Fuel Systems for more informa-
tion.
A DTC does not identify which component in a cir-
cuit is bad. Thus, a DTC should be treated as a
symptom, not as the cause for the problem. In some
cases, because of the design of the diagnostic test
procedure, a DTC can be the reason for another DTC
to be set. Therefore, it is important that the test pro-
cedures be followed in sequence, to understand what
caused a DTC to be set.
See Speed Control Diagnostic Trouble Code chart
for DTC's which apply to the speed control system.Refer to the Powertrain Diagnostic Procedures man-
ual to diagnose an on-board diagnostic system trou-
ble code.
RETRIEVING DIAGNOSTIC TROUBLE CODES
To start this function, cycle the ignition switch ON-
OFF-ON-OFF-ON within 5 seconds. This will cause
any DTC stored in the PCM memory to be displayed.
The malfunction indicator (Check Engine) lamp will
display a DTC by flashing on and off. There is a
short pause between flashes and a longer pause be-
tween digits. All DTC's displayed are two-digit num-
bers, with a four-second pause between codes.
An example of a DTC is as follows:
(1) Lamp on for 2 seconds, then turns off.
(2) Lamp flashes 1 time pauses and then flashes 5
times.
(3) Lamp pauses for 4 seconds, flashes 3 times,
pauses, then flashes 4 times.
The two DTC's are 15 and 34. Any number of
DTC's can be displayed, as long as they are in mem-
ory. The lamp will flash until all stored DTC's are
displayed (55 = end of test).
If a DTC 15 is observed, see diagnosis for Vehicle
Speed Sensor in this group. If a DTC 34 is observed,
see diagnosis for Speed Control Servo and Power-
train Control Module in this group. Correct any prob-
lems found in your diagnosis, then recheck for DTC
after corrections are completed.
VEHICLE SPEED SENSOR
For diagnosis of the VSS, refer to the appropriate
Powertrain Diagnostic Procedures manual.
SPEED CONTROL DIAGNOSTIC TROUBLE CODE
JVEHICLE SPEED CONTROL SYSTEM 8H - 5

MULTI-PORT FUEL INJECTION (MFI)ÐGENERAL DIAGNOSIS
INDEX
page page
Automatic Shutdown (ASD) Relay Testing....... 46
Camshaft Position Sensor Test............... 46
Crankshaft Position Sensor Test.............. 47
Diagnostic Trouble Code (DTC)............... 54
DRB Scan Tool........................... 54
Engine Coolant Temperature Sensor Test....... 46
Extended Idle Switch Test................... 48
Fuel Injector Test......................... 51
Fuel Pump Relay Testing................... 47
Fuel System Pressure Test.................. 51
General Information....................... 35
Idle Air Control Motor Test................... 49
Intake Manifold Air Temperature Sensor Test..... 46Manifold Absolute Pressure (Map) Sensor Test . . . 47
On-Board Diagnostics (OBD)................. 51
Oxygen Sensor (O2S) Heating Element Test..... 48
Pcm System Schematics.................... 41
Powertrain Control Module (PCM) 60-Way
Connector............................. 40
RelaysÐOperation/Testing.................. 50
Starter Motor Relay Test.................... 51
Throttle Position Sensor (TPS) Test............ 48
Torque Converter Clutch Relay Test............ 48
Vehicle Speed Sensor Test.................. 48
Visual Inspection.......................... 35
GENERAL INFORMATION
All 2.5L 4-cylinder and 4.0L 6-cylinder engines are
equipped with sequential Multi-Port Fuel Injection
(MFI). The MFI system provides precise air/fuel ra-
tios for all driving conditions.
VISUAL INSPECTION
A visual inspection for loose, disconnected, or incor-
rectly routed wires and hoses should be made. This
should be done before attempting to diagnose or ser-
vice the fuel injection system. A visual check will
help spot these faults and save unnecessary test and
diagnostic time. A thorough visual inspection will in-
clude the following checks:
(1) Verify that the 60-way connector is fully in-
serted into the connector of the powertrain control
module (PCM) (Figs. 1 or 2). Verify that the connec-
tor mounting bolt is tightened to 4 Nzm (35 in. lbs.)
torque.(2) Inspect the battery cable connections. Be sure
they are clean and tight.
(3) Inspect fuel pump relay and air conditioning
compressor clutch relay (if equipped). Inspect ASD
relay and radiator fan relay (if equipped) connec-
tions. Inspect starter motor relay connections. In-
spect relays for signs of physical damage and
corrosion. The relays are installed in the power dis-
tribution center (PDC) (Figs. 3 or 4).
(4) Inspect ignition coil connections. Verify that coil
secondary cable is firmly connected to coil (Figs. 5 or
6).
(5) Verify that distributor cap is correctly attached
to distributor. Be sure that spark plug cables are
firmly connected to the distributor cap and the spark
plugs in their correct firing order. Be sure that coil
cable is firmly connected to distributor cap and coil.
Be sure that camshaft position sensor wire connector
is firmly connected to harness connector (Figs. 7 or
8). Inspect spark plug condition. Refer to Group 8D,
Fig. 1 PCMÐYJ Models
Fig. 2 PCMÐXJ Models
JFUEL SYSTEM GENERAL DIAGNOSIS 14 - 35

CYLINDER COMBUSTION PRESSURE
LEAKAGE TEST DIAGNOSIS..............9-7
CYLINDER COMPRESSION PRESSURE
TEST................................9-5
CYLINDER DISPOSALÐXJ, LIFTGATE
SUPPORT ROD......................23-63
CYLINDER ENGINE, VACUUM ROUTING
SCHEMATICÐ2.5L 4...................25-3
CYLINDER ENGINE, VACUUM ROUTING
SCHEMATICÐ4.0L 6...................25-3
CYLINDER HEAD COVER, ENGINE....9-22,9-64
CYLINDER HEAD, ENGINE...........9-25,9-67
CYLINDER HEAD GASKET FAILURE
DIAGNOSIS, ENGINE....................9-5
CYLINDER INSTALLATION (NON-ABS),
MASTER............................5-16
CYLINDER INSTALLATION, WHEEL........5-58
CYLINDER OVERHAUL (4-CYLINDER
MODELS), MASTER....................5-16
CYLINDER OVERHAUL, WHEEL...........5-57
CYLINDER REMOVAL (NON-ABS),
MASTER............................5-15
CYLINDER REMOVAL, WHEEL...........5-57
CYLINDER SERVICE, IGNITION SWITCH
AND KEY...........................8D-26
CYLINDERÐCOMBINATION VALVE,
MASTER............................5-15
CYLINDERÐXJ, DOOR KEY LOCK.......23-47
CYLINDERÐXJ, LIFTGATE SUPPORT
ROD...............................23-62
CYLINDERÐYJ, FULL-METAL DOOR KEY
LOCK..............................23-139
CYLINDERÐYJ, TAILGATE LOCK.......23-122
CYLINDER/POWER BOOSTER TEST,
MASTER.............................5-8
CYLINDER/POWER BRAKE BOOSTER,
MASTER............................5-34
CYLINDER/STRIKERÐXJ, LIFTGATE
LATCH/KEY LOCK....................23-61
DAMAGED OR WORN THREADS, REPAIR....9-4
DAMPER, ENGINE.....................9-17
DAMPER, STEERING.............19-17,19-20
DAMPER, VIBRATION..............9-30,9-72
DASH PANEL INSULATOR PANELÐXJ....23-12
DATA LINK CONNECTOR; ANTI-LOCK
BRAKES (XJ)......................8W-32-2
DATA LINK CONNECTOR; ANTI-LOCK
BRAKES (XJ-RHD).................8W-32-2
DATA LINK CONNECTOR; ANTI-LOCK
BRAKES (YJ)......................8W-32-2
DATA LINK CONNECTOR; FUEL/IGNITION
(XJ).............................8W-30-5
DATA LINK CONNECTOR; FUEL/IGNITION
(YJ).............................8W-30-5
DATA LINK CONNECTOR;
TRANSMISSION CONTROLS (XJ-RHD) . . 8W-31-1
DATA LINK CONNECTOR; FUEL/IGNITION
(XJ-RHD).........................8W-30-4
DATA LINK CONNECTORÐPCM INPUT....14-22
DATA LINK CONNECTORÐPCM OUTPUT . . 14-27
DATA, VEHICLE DIMENSION.....Intro.-5,Intro.-6
DATA, VEHICLE LOAD................Intro.-5
DATAÐXJ, VEHICLE LOAD............Intro.-7
DATAÐYJ, VEHICLE LOAD............Intro.-8
DAYTIME RUNNING LAMP (DRL)
MODULE; FRONT LIGHTING (XJ)......8W-50-2
DAYTIME RUNNING LAMP (DRL)
MODULEÐCANADIAN VEHICLES ONLY;
FRONT LIGHTING (YJ)
..............8W-50-2
DAYTIME RUNNING LIGHTS (CANADA
ONLY)ÐXJ
.........................8L-15
DAYTIME RUNNING LIGHTS (CANADA
ONLY)ÐYJ
.........................8L-30
DECODING, VEHICLE CODE
...........Intro.-5
DECODING, VEHICLE IDENTIFICATION
NUMBER (VIN)
.....................Intro.-4
DEFLECTORÐXJ, COWL WEATHERSTRIP
SEAL/CROSSMEMBER AIR
.............23-11
DEFOGGER RELAY
....................8N-3
DEFOGGER RELAY/TIMER
...............8N-1
DEFOGGER RELAY/TIMER REMOVE/
INSTALL
............................8N-4
DEFOGGER SWITCH
...............8N-1,8N-3
DEFOGGER SWITCH REMOVE/INSTALL
....8N-4
DEFROSTER NOZZLE AND DUCT
........24-33
DELAY FUNCTION TROUBLE
DIAGNOSISÐXJ, HEADLAMP
...........8L-14DELAY MODULE, HEADLAMP; FRONT
LIGHTING (XJ)....................8W-50-2
DELAY MODULE, HEADLAMP; FRONT
LIGHTING (XJ-RHD)................8W-50-1
DELAY MODULE REPLACEMENTÐXJ,
HEADLAMP.........................8L-14
DELAY MODULEÐXJ, SENTINEL
HEADLAMP.........................8L-14
DELIVERY SYSTEM, FUEL...............14-3
DEMAGNETIZING, COMPASS............8C-5
DEPTH INFORMATION, PINION GEAR;
FRONT SUSPENSION AND AXLE..........2-39
DEPTH INFORMATION, PINION GEAR;
REAR SUSPENSION AND AXLES..........3-21
DEPTH VARIANCE, PINION GEAR; FRONT
SUSPENSION AND AXLE................2-40
DEPTH VARIANCE, PINION GEAR; REAR
SUSPENSION AND AXLES...........3-22,3-39
DESCRIPTION; HEATING AND AIR
CONDITIONING............24-19,24-23,24-32
DESCRIPTION; TRANSMISSION AND
TRANSFER CASE....................21-165
DESCRIPTION/SYSTEM OPERATION,
MULTI-PORT FUEL INJECTION
(MFI)ÐCOMPONENT..................14-19
DESIGNATIONS, LABELS/PLATES, CODES
AND DIMENSIONS..................Intro.-1
DESIGNATIONS, VEHICLE.............Intro.-1
DESIGNATIONS, VEHICLE CODE........Intro.-1
DETECTION AND REPAIRÐXJ,
STATIONARY GLASS WATER LEAK.......23-76
DETECTION AND REPAIRÐYJ,
STATIONARY GLASS WATER LEAK.......23-150
DEVICES, ELECTROSTATIC DISCHARGE
(ESD) SENSITIVE; WIRING
DIAGRAMSÐGENERAL INFORMATION
(XJ)...............................8W-2
DIAGNOSING PARKING BRAKE
MALFUNCTIONS.......................5-8
DIAGNOSIS; AUDIO SYSTEMS...........8F-2
DIAGNOSIS; BATTERY/STARTING/
CHARGING SYSTEMS DIAGNOSTICS.....8A-10,
8A-11,8A-17,8A-3
DIAGNOSIS; CHIME/BUZZER WARNING
SYSTEMS...........................8U-2
DIAGNOSIS; COOLING SYSTEM...........7-4
DIAGNOSIS; HORNS...................8G-2
DIAGNOSIS; INSTRUMENT PANEL AND
GAUGESÐXJ....................8E-27,8E-5
DIAGNOSIS; OVERHEAD CONSOLE........8C-2
DIAGNOSIS; POWER LOCKS.............8P-2
DIAGNOSIS; POWER MIRRORS..........8T-1
DIAGNOSIS; POWER SEATS.............8R-2
DIAGNOSIS; POWER WINDOWS..........8S-1
DIAGNOSIS; REAR WINDOW DEFOGGER . . . 8N-1
DIAGNOSIS; RESTRAINT SYSTEMS.......8M-2
DIAGNOSIS; STEERING................19-37
DIAGNOSIS; TURN SIGNAL AND HAZARD
WARNING SYSTEMS...................8J-3
DIAGNOSIS; VEHICLE SPEED CONTROL
SYSTEM............................8H-2
DIAGNOSIS, 2.5L STARTER NOISE.......8A-16
DIAGNOSIS, 30RH/32RH TRANSMISSION . 21-70
DIAGNOSIS, ABS BRAKE.................5-3
DIAGNOSIS, ANTILOCK ECU AND HCU......5-3
DIAGNOSIS, AW-4 TRANSMISSION.....21-176
DIAGNOSIS, AXLE NOISE/VIBRATION;
FRONT SUSPENSION AND AXLE..........2-18
DIAGNOSIS, AXLE NOISE/VIBRATION;
REAR SUSPENSION AND AXLES..........3-9
DIAGNOSIS, BATTERY..................8A-4
DIAGNOSIS, BELT.....................7-38
DIAGNOSIS, CHARGING SYSTEM........8A-19
DIAGNOSIS, CLUTCH...................6-3
DIAGNOSIS, COMPASS/THERMOMETER....8C-4
DIAGNOSIS (CONT.), COOLING SYSTEM . . . 7-10,
7-11,7-12,7-7,7-8,7-9
DIAGNOSIS (CONT.), SERPENTINE DRIVE
BELT ...............................7-40
DIAGNOSIS (CONT'D), DISCONNECT
AXLE/SHIFT MOTOR
...................2-30
DIAGNOSIS (CONT'D), SERVICE; FRONT
SUSPENSION AND AXLE
................2-21
DIAGNOSIS (CONT'D), SERVICE; REAR
SUSPENSION AND AXLES
...............3-12
DIAGNOSIS, CONVERTER HOUSING
LEAK
..............................21-75
DIAGNOSIS, COOLING SYSTEM
...........7-6DIAGNOSIS, CYLINDER COMBUSTION
PRESSURE LEAKAGE TEST...............9-7
DIAGNOSIS, DISCONNECT AXLE/SHIFT
MOTOR.............................2-29
DIAGNOSIS, ENGINE....................9-5
DIAGNOSIS, ENGINE CYLINDER HEAD
GASKET FAILURE......................9-5
DIAGNOSIS, EXHAUST SYSTEM..........11-2
DIAGNOSIS, FOG LAMP...........8L-21,8L-3
DIAGNOSIS, GEAR LEAKAGE............19-10
DIAGNOSIS, HEADLAMP...........8L-20,8L-2
DIAGNOSIS, HEATER..................24-17
DIAGNOSIS, HEATING SYSTEM..........24-18
DIAGNOSIS, IGNITION SECONDARY
CIRCUIT...........................8D-10
DIAGNOSIS INFORMATION, GENERAL;
CLUTCH..............................6-3
DIAGNOSIS INFORMATION, GENERAL;
TRANSMISSION AND TRANSFER CASE . . 21-176
DIAGNOSIS, INTAKE MANIFOLD
LEAKAGE.............................9-5
DIAGNOSIS, MANUAL STEERING
SYSTEM............................19-38
DIAGNOSIS, MULTI-PORT FUEL
INJECTION (MFI)ÐGENERAL...........14-35
DIAGNOSIS, NP231 SERVICE..........21-285
DIAGNOSIS, NP242 SERVICE..........21-308
DIAGNOSIS, PERFORMANCE............24-14
DIAGNOSIS, POWER STEERING SYSTEM . . 19-3,
19-4,19-5,19-6,19-7,19-8,19-9
DIAGNOSIS, PUMP LEAKAGE...........19-10
DIAGNOSIS, RADIO....................8F-3
DIAGNOSIS, SERPENTINE DRIVE BELT.....7-39
DIAGNOSIS, SERVICE; FRONT
SUSPENSION AND AXLE................2-20
DIAGNOSIS, SERVICE; PROPELLER
SHAFTS.............................16-3
DIAGNOSIS, SERVICE; REAR
SUSPENSION AND AXLES...............3-11
DIAGNOSIS, SERVICE; TRANSMISSION
AND TRANSFER CASE . 21-180,21-181,21-34,21-2
DIAGNOSIS, SERVICE BRAKE.............5-4
DIAGNOSIS, SPRING AND SHOCK;
FRONT SUSPENSION AND AXLE......2-13,2-15
DIAGNOSIS, SPRING AND SHOCK; REAR
SUSPENSION AND AXLES.............3-3,3-6
DIAGNOSIS, SPRING AND SHOCK
ABSORBER........................3-3,3-6
DIAGNOSIS, STARTER NOISE...........8A-16
DIAGNOSIS, STARTING SYSTEM........8A-12
DIAGNOSIS, SUSPENSION AND
STEERING SYSTEM.....................2-7
DIAGNOSIS, THERMOMETER............8C-2
DIAGNOSIS, TORQUE CONVERTER . 21-86,21-87,
21-88
DIAGNOSIS, TRANSMISSION . 21-78,21-79,21-80,
21-81,21-82,21-83,21-84,21-85
DIAGNOSIS, VIBRATION..........22-10,22-11
DIAGNOSISÐLUBRICATION SERVICE......9-12
DIAGNOSISÐXJ, DOME/COURTESY
LAMP TROUBLE.....................8L-16
DIAGNOSISÐXJ, HEADLAMP DELAY
FUNCTION TROUBLE..................8L-14
DIAGNOSISÐXJ, LIGHTED VANITY
MIRROR TROUBLE...................8L-16
DIAGNOSISÐYJ, DOME/COURTESY
LAMP TROUBLE.....................8L-31
DIAGNOSTIC CONNECTOR, ABS.......5-35,5-3
DIAGNOSTIC PROCEDURESÐXJ.........8L-1
DIAGNOSTIC PROCEDURESÐYJ........8L-19
DIAGNOSTIC SYSTEM, USING
ON-BOARD; BATTERY/STARTING/
CHARGING SYSTEMS DIAGNOSTICS.....8A-22
DIAGNOSTIC SYSTEM, USING
ON-BOARD; VEHICLE SPEED CONTROL
SYSTEM............................8H-5
DIAGNOSTIC TROUBLE CODE (DTC)......14-54
DIAGNOSTIC TROUBLE CODE,
GENERATOR........................8A-22
DIAGNOSTIC TROUBLE CODE, SPEED
CONTROL
...........................8H-5
DIAGNOSTICS (OBD), ON-BOARD;
COOLING SYSTEM
.....................7-4
DIAGNOSTICS (OBD), ON-BOARD; FUEL
SYSTEM
............................14-51
DIAGNOSTICS, ON-BOARD
.............8D-15
DIAGRAM INDEX; AIR CONDITIONING/
HEATER (XJ)
......................8W-42-2
JINDEX 7
Description Group-Page Description Group-Page Description Group-Page

MULTI-FUNCTION SWITCH TESTING
PROCEDURESÐXJ....................8L-4
MULTI-PORT FUEL INJECTION
(MFI)ÐCOMPONENT DESCRIPTION/
SYSTEM OPERATION..................14-19
MULTI-PORT FUEL INJECTION
(MFI)ÐCOMPONENT REMOVAL/
INSTALLATION.......................14-58
MULTI-PORT FUEL INJECTION
(MFI)ÐGENERAL DIAGNOSIS...........14-35
NAMEPLATES (ADHESIVE-BACKED)ÐYJ,
EXTERIOR.........................23-120
NAMEPLATESÐXJ, EXTERIOR..........23-26
NEUTRAL SWITCH, PARK..............14-63
NO LUBRICATION, COMPONENTS
REQUIRING...........................0-2
NOISE DIAGNOSIS, 2.5L STARTER.......8A-16
NOISE DIAGNOSIS, STARTER...........8A-16
NOISE, GEAR AND BEARING; FRONT
SUSPENSION AND AXLE................2-18
NOISE, GEAR AND BEARING; REAR
SUSPENSION AND AXLES................3-9
NOISE OR VIBRATION, TIRE.............22-4
NOISE SUPPRESSION, RADIO............8F-2
NOISE/VIBRATION DIAGNOSIS, AXLE;
FRONT SUSPENSION AND AXLE..........2-18
NOISE/VIBRATION DIAGNOSIS, AXLE;
REAR SUSPENSION AND AXLES..........3-9
NO-LEAD FUEL TANK FILLER TUBE......14-13
NON-INTERMITTENT WIPE SWITCH
TESTING...........................8K-14
NON-TILT STEERING COLUMN............19-60
NORMAL BRAKING MODE, ABS
OPERATION IN.......................5-35
NORMAL OPERATING CONDITIONS........5-3
NOTATIONÐSAE AND METRIC, THREAD . Intro.-13
NOTES, CAUTIONS, AND WARNINGS;
WIRING DIAGRAMSÐGENERAL
INFORMATION (XJ)...................8W-1
NOZZLE AND DUCT, DEFROSTER........24-33
NOZZLE REMOVE/INSTALL, LIFTGATE
WASHER...........................8K-24
NOZZLE/TUBEÐXJ, FUEL FILLER........23-26
NP231 SERVICE DIAGNOSIS...........21-285
NP231 TRANSFER CASE........21-283,21-305
NP231 TRANSFER CASE, LEGEND......21-306
NP231/NP242 TORQUE SPECIFICATIONS . 21-344
NP242 SERVICE DIAGNOSIS...........21-308
NP242 TRANSFER CASE........21-307,21-331
NP242 TRANSFER CASE, LEGEND......21-332
NUMBER (VIN) DECODING, VEHICLE
IDENTIFICATION....................Intro.-4
NUMBER (VIN) PLATE, VEHICLE
IDENTIFICATION....................Intro.-4
NUT TIGHTENING, WHEEL..........5-54,5-59
NUT, WHEEL LUG....................22-12
(OHMS)ÐCOOLANT TEMPERATURE
SENSOR/MANIFOLD AIR
TEMPERATURE, SENSOR RESISTANCE
....14-46
OIL CHANGE AND FILTER
REPLACEMENT, ENGINE
................0-16
OIL COOLERS, TRANSMISSION
..........7-36
OIL, ENGINE
.........................0-15
OIL FILTER, ENGINE
...................0-17
OIL FILTER REPLACEMENT
............21-103
OIL PAN
........................9-36,9-77
OIL PRESSURE, ENGINE
.................9-7
OIL PRESSURE GAUGE
..............8W-40-2
OIL PRESSURE WARNING LAMP;
INSTRUMENT CLUSTER (XJ)
.........8W-40-2
OIL PRESSURE WARNING LAMP;
INSTRUMENT CLUSTER (XJ-RHD)
.....8W-40-1
OIL PUMP
.......................9-39,9-81
OIL PUMP OVERHAUL
.........21-131,21-216
OIL PUMP SEAL REPLACEMENT
........21-199
OIL PUMP WEAR LIMITS, AW-4
........21-338
OIL, REFRIGERANT
...................24-12
OIL SEAL REPLACEMENT, INNER AXLE
SHAFT
..............................2-35
OIL SEAL REPLACEMENT, TIMING CASE
COVER
..........................9-30,9-73
OIL SEALS, REAR MAIN
............9-49,9-89
OIL SEALS, VALVE SPRINGS
.............9-23
ON-BOARD DIAGNOSTIC SYSTEM,
USING; BATTERY/STARTING/CHARGING
SYSTEMS DIAGNOSTICS
...............8A-22ON-BOARD DIAGNOSTIC SYSTEM,
USING; VEHICLE SPEED CONTROL
SYSTEM............................8H-5
ON-BOARD DIAGNOSTICS.............8D-15
ON-BOARD DIAGNOSTICS (OBD);
COOLING SYSTEM.....................7-4
ON-BOARD DIAGNOSTICS (OBD); FUEL
SYSTEM............................14-51
ONLY, DAYTIME RUNNING LAMP (DRL)
MODULEÐCANADIAN VEHICLES;
FRONT LIGHTING (YJ)..............8W-50-2
ONLY, POWER STEERING PRESSURE
SWITCHÐ2.5L ENGINE................14-63
ONLY, TORQUE CONVERTER CLUTCH
(TCC) SOLENOID AND RELAYÐ2.5L
ENGINE; TRANSMISSION CONTROLS
(XJ).............................8W-31-1
ONLY, TRANSMISSION CONTROL
MODULEÐ4.0L ENGINE;
TRANSMISSION CONTROLS (XJ)......8W-31-1
OPENING PANEL (GOP)ÐXJ, GRILLE
AND GRILLE.........................23-3
OPENING WEATHERSTRIP SEALÐXJ,
LIFTGATE...........................23-64
OPENING WEATHERSTRIP SEALSÐXJ,
DOOR WINDOW GLASS AND DOOR......23-55
OPERATING SPECIFICATIONS, PUMP......19-3
OPERATION, ACCELERATION SWITCH.....5-37
OPERATION, AIR CONDITIONING; AIR
CONDITIONING/HEATER (XJ).........8W-42-2
OPERATION, AIR CONDITIONING; AIR
CONDITIONING/HEATER (XJ-RHD).....8W-42-2
OPERATION AND APPLICATION CHARTS,
GEARTRAIN........................21-169
OPERATION AND SERVICE, ABS..........5-33
OPERATION AND WEAR
COMPENSATION, CALIPER..............5-45
OPERATION, BRAKE WARNING LIGHT......5-5
OPERATION, CLUTCH...................6-2
OPERATION, COMPONENT
IDENTIFICATION/SYSTEM...............8D-1
OPERATION, ECU.....................5-37
OPERATION, HCU.....................5-36
OPERATION, HEATER AND A/C...........24-1
OPERATION IN ANTILOCK BRAKING
MODE, ABS..........................5-36
OPERATION IN NORMAL BRAKING
MODE, ABS..........................5-35
OPERATION, MULTI-PORT FUEL
INJECTION (MFI)ÐCOMPONENT
DESCRIPTION/SYSTEM................14-19
OPERATION, PARKING BRAKE...........5-60
OPERATION, POWER BRAKE BOOSTER....5-23
OPERATION, POWER STEERING
PUMPÐINITIAL......................19-15
OPERATION, WHEEL SPEED SENSOR......5-37
ORDERÐ2.5L 4-CYLINDER ENGINE,
ENGINE FIRING......................8D-32
ORDERÐ4.0L 6-CYLINDER ENGINE,
ENGINE FIRING......................8D-32
O-RING SEAL, FLOW CONTROL VALVE
FITTING............................19-14
ORNAMENTATION, WHEEL..............22-6
OUTER SCUFF PLATESÐXJ............23-89
OUTLET VACUUM MOTOR
REPLACEMENT, HEATER/DEFROSTER/
INSTRUMENT PANEL..................24-26
OUTPUT, AIR CONDITIONING (A/C)
CLUTCH RELAYÐPCM................14-26
OUTPUT, AUTO SHUTDOWN (ASD)
RELAYÐPCM.......................14-26
OUTPUT, DATA LINK CONNECTORÐPCM . . 14-27
OUTPUT, EMR LAMPÐPCM
............14-27
OUTPUT, FUEL INJECTORSÐPCM
.......14-27
OUTPUT, FUEL PUMP RELAYÐPCM
......14-27
OUTPUT, GENERATOR FIELDÐPCM
......14-27
OUTPUT, GENERATOR LAMPÐPCM
......14-27
OUTPUT, IDLE AIR CONTROL (IAC)
MOTORÐPCM
.......................14-27
OUTPUT, IGNITION COILÐPCM
.........14-28
OUTPUT, MALFUNCTION INDICATOR
LAMPÐPCM
........................14-28
OUTPUT, RADIATOR FAN RELAYÐPCM
. . . 14-28
OUTPUT, SCI TRANSMITÐPCM
.........14-29
OUTPUT, SHIFT INDICATORÐPCM
.......14-29
OUTPUT, SPEED CONTROLÐPCM
.......14-29
OUTPUT, TACHOMETERÐPCM
..........14-29OUTPUT, TORQUE CONVERTER CLUTCH
RELAYÐPCM.......................14-29
OUTPUT VOLTAGE SPECIFICATIONS......8A-23
OUTS, TAKE; WIRING DIAGRAMSÐ
GENERAL INFORMATION (XJ)...........8W-2
OVERDRIVE COMPONENTS, FOURTH
GEAR.............................21-167
OVERDRIVE PLANETARY GEAR AND
CLUTCH OVERHAUL.................21-218
OVERDRIVE SUPPORT OVERHAUL......21-226
OVERHAUL, 30RH/32RH TRANSMISSION . 21-119
OVERHAUL (4-CYLINDER MODELS),
MASTER CYLINDER...................5-16
OVERHAUL, ADAPTER/EXTENSION
HOUSING INSPECTION AND PARK
LOCK COMPONENT..................21-127
OVERHAUL, AW-4 TRANSMISSION......21-201
OVERHAUL, DIFFERENTIAL..............3-46
OVERHAUL, DIRECT CLUTCH..........21-228
OVERHAUL, FIRST-REVERSE BRAKE
PISTON AND TRANSMISSION CASE.....21-247
OVERHAUL, FORWARD CLUTCH........21-232
OVERHAUL, FRONT CLUTCH...........21-134
OVERHAUL, FRONT PLANETARY GEAR . . . 21-237
OVERHAUL, GOVERNOR AND PARK
GEAR.............................21-127
OVERHAUL, MANUAL VALVE SHAFT.....21-215
OVERHAUL, OIL PUMP.........21-131,21-216
OVERHAUL OR FLUID/FILTER CHANGE,
REFILLING AFTER.............21-100,21-182
OVERHAUL, OVERDRIVE PLANETARY
GEAR AND CLUTCH..................21-218
OVERHAUL, OVERDRIVE SUPPORT.....21-226
OVERHAUL, OVERRUNNING CLUTCHÐ
LOW-REVERSE DRUMÐREAR
SUPPORT.........................21-125
OVERHAUL, PLANETARY GEAR TRAIN . . . 21-141
OVERHAUL, REAR CLUTCH............21-138
OVERHAUL, REAR SERVO AND BAND . . . 21-146
OVERHAUL, TRANSFER CASE
DISASSEMBLY................21-289,21-310
OVERHAUL, TRANSMISSION
DISASSEMBLY...................21-37,21-5
OVERHAUL, TRANSMISSION VALVE
BODY.............................21-250
OVERHAUL, WHEEL CYLINDER...........5-57
OVERHEAD CONSOLE; OVERHEAD
CONSOLE (XJ)....................8W-49-1
OVERHEAD CONSOLE; OVERHEAD
CONSOLE (XJ-RHD)................8W-49-1
OVERHEAD CONSOLE REMOVE/INSTALL . . . 8C-6
OVERHEAD CONSOLEÐXJ; BODY
COMPONENTSÐXJ VEHICLES..........23-93
OVERHEAD CONSOLEÐXJ; LAMPS......8L-17
OXYGEN (O2S) SENSOR; EMISSION
CONTROL SYSTEMS...............25-6,25-7
OXYGEN (O2S) SENSOR; FUEL SYSTEM . . 14-63
OXYGEN (O2S) SENSOR; IGNITION
SYSTEMS......................8D-23,8D-5
OXYGEN (O2S) SENSOR TESTS.........8D-15
OXYGEN (O2S) SENSORÐPCM INPUT....14-24
OXYGEN SENSOR, HEATED; FUEL/
IGNITION (XJ).....................8W-30-3
OXYGEN SENSOR, HEATED; FUEL/
IGNITION (YJ).....................8W-30-3
OXYGEN SENSOR, HEATED; FUEL/
IGNITION (XJ-RHD)................8W-30-3
OXYGEN SENSOR (O2S) HEATING
ELEMENT TEST
......................14-48
PACK MEASUREMENT AND
ADJUSTMENT, DIFFERENTIAL SHIM
.......2-43
PACK REQUIREMENTS, AW-4 CLUTCH
AND BRAKE
........................21-341
PACKAGE CLUSTER, GAUGE
.......8E-31,8E-43
PAINT
............................23-158
PAINT AND TRIM REPAIR PRODUCTSÐ
XJ, AFTERMARKET
..................23-159
PAINT AND TRIM REPAIR PRODUCTSÐ
YJ, AFTERMARKET
..................23-160
PAINTED SURFACE TOUCH-UP
.........23-158
PAN, OIL
........................9-36,9-77
PANEL AND GAUGESÐYJ, INSTRUMENT
. . 8E-24
PANEL COMPONENTSÐYJ,
INSTRUMENT
......................23-152
PANEL DIMMER SWITCH REMOVE/
INSTALL, HEADLAMP OR
..............8E-42
PANEL EXTENSIONÐXJ, QUARTER TRIM
. 23-87
JINDEX 19
Description Group-Page Description Group-Page Description Group-Page