2002 JEEP GRAND CHEROKEE Fluid level

Component Page
RIGHT FRONT WHEEL SPEED
SENSOR....................... 8W-80-115
RIGHT HEADLAMP LEVELING MOTOR
(BUILT-UP-EXPORT)............. 8W-80-115
RIGHT HIGH BEAM HEADLAMP..... 8W-80-116
RIGHT INSTRUMENT PANEL
SPEAKER...................... 8W-80-116
RIGHT LIFTGATE AJAR SWITCH..... 8W-80-116
RIGHT LOW BEAM HEADLAMP..... 8W-80-116
RIGHT MULTI-FUNCTION SWITCH . . . 8W-80-116
RIGHT REAR DOOR LOCK
MOTOR/AJAR SWITCH........... 8W-80-117
RIGHT REAR DOOR SPEAKER....... 8W-80-117
RIGHT REAR LAMP ASSEMBLY...... 8W-80-117
RIGHT REAR WHEEL SPEED
SENSOR....................... 8W-80-117
RIGHT REMOTE RADIO SWITCH.... 8W-80-117
RIGHT SIDE REPEATER LAMP
(BUILT-UP-EXPORT)............. 8W-80-118
RIGHT VISOR/VANITY LAMP........ 8W-80-118
SEAT BELT SWITCH............... 8W-80-118
SEAT MODULE C1 (PREMIUM)...... 8W-80-118
SEAT MODULE C2 (PREMIUM)...... 8W-80-119
SENTRY KEY IMMOBILIZER
MODULE...................... 8W-80-119
SHIFTER ASSEMBLY
(C201 DIESEL).................. 8W-80-119
SHIFTER ASSEMBLY (GAS)......... 8W-80-120
SHIFTER ASSEMBLY C1 (DIESEL).... 8W-80-120
SHIFTER ASSEMBLY C2 (DIESEL).... 8W-80-120
SIREN (BUILT-UP-EXPORT)......... 8W-80-120
SPEED CONTROL SWITCH NO. 1.... 8W-80-120
SPEED CONTROL SWITCH NO. 2.... 8W-80-121
SUNROOF CONTROL MODULE...... 8W-80-121
SUNROOF MOTOR C1.............. 8W-80-121
SUNROOF MOTOR C2.............. 8W-80-121
SUNROOF SWITCH................ 8W-80-121Component Page
TEMPERATURE VALVE
ACTUATOR (MTC)............... 8W-80-122
THROTTLE POSITION
SENSOR (4.0L).................. 8W-80-122
THROTTLE POSITION
SENSOR (4.7L).................. 8W-80-122
TRAILER TOW BRAKE
LAMP RELAY................... 8W-80-122
TRAILER TOW CIRCUIT
BREAKER...................... 8W-80-122
TRAILER TOW CONNECTOR........ 8W-80-123
TRAILER TOW LEFT TURN
RELAY........................ 8W-80-123
TRAILER TOW RIGHT TURN
RELAY........................ 8W-80-123
TRANSFER CASE POSITION
SENSOR....................... 8W-80-123
TRANSMISSION CONTROL
MODULE (4.7L)................. 8W-80-124
TRANSMISSION CONTROL
MODULE C1 (DIESEL)........... 8W-80-125
TRANSMISSION CONTROL
MODULE C2 (DIESEL)........... 8W-80-125
TRANSMISSION SOLENOID (4.0L).... 8W-80-125
TRANSMISSION SOLENOID
ASSEMBLY (DIESEL)............ 8W-80-126
TRANSMISSION SOLENOID/TRS
ASSEMBLY (4.7L)................ 8W-80-126
UNDERHOOD LAMP............... 8W-80-126
VEHICLE INFORMATION CENTER . . . 8W-80-127
VISCOUS/CABIN HEATER
(DIESEL)...................... 8W-80-127
WASHER FLUID LEVEL SWITCH.... 8W-80-127
WASTEGATE SOLENOID
(DIESEL)...................... 8W-80-127
WATER IN FUEL SENSOR
(DIESEL)...................... 8W-80-127
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 5

BODY CONTROL MODULE C1 - GRAY 26 WAY
CAV CIRCUIT FUNCTION
1 Z132 20BK/OR GROUND
2 G52 20YL HEADLAMP SWITCH MUX
3 E19 20RD PANEL LAMPS DIMMER SIGNAL
4- -
5 G70 20BR/TN (BUILT-UP-EXPORT LHD
RHD)HOOD AJAR SWITCH SENSE
6 G26 20LB KEY-IN IGNITION SWITCH SENSE
7 G76 18TN/YL RIGHT REAR DOOR AJAR SWITCH SENSE
8 E2 20OR PANEL LAMPS DRIVER
9 E2 20OR PANEL LAMPS DRIVER
10 E2 20OR PANEL LAMPS DRIVER
11 - -
12 E2 20OR PANEL LAMPS DRIVER
13 E2 20OR PANEL LAMPS DRIVER
14 Z132 20BK/OR GROUND
15 D25 20YL/VT/WT PCI BUS
16 L80 20WT/DG HEADLAMP SWITCH RETURN
17 D19 20VT/OR BODY CONTROL MODULE FLASH ENABLE
18 - -
19 - -
20 G69 20BK/OR VTSS INDICATOR DRIVER
21 - -
22 V14 20RD/VT WIPER ON/OFF RELAY CONTROL
23 M20 20BR/OR COURTESY LAMP LOAD SHED
24 M2 20YL COURTESY LAMP DRIVER
25 Z234 20BK GROUND
26 - -
BODY CONTROL MODULE C2 - GRAY 22 WAY
CAV CIRCUIT FUNCTION
1 C103 20DG A/C SWITCH SIGNAL
2 V10 20BR WASHER PUMP SWITCH SENSE
3 V48 20RD/GY WIPER HIGH CONTROL
4 L40 20BR HIGH BEAM SWITCH SENSE
5 V11 20BK/TN WASHER FLUID SWITCH SENSE
6 P134 20TN/LG PASSENGER SEAT HEATER SWITCH MUX
7 P133 20TN/DG DRIVER SEAT HEATER SWITCH MUX
8 X20 20RD/YL RADIO CONTROL MUX
9 G31 20VT/LG AMBIENT TEMPERATURE SENSOR SIGNAL
10 L109 20WT ULTRALIGHT SENSOR SIGNAL
11 V52 20DG/RD WINDSHIELD WIPER SWITCH MUX
12 C81 20LB/WT REAR WINDOW DEFOGGER SWITCH SENSE
13 - -
14 - -
15 L27 20WT/TN FOG LAMP SWITCH SENSE
16 C201 20LB/YL EVAPORATOR TEMPERATURE SENSOR SIGNAL
17 G18 20PK/BK COOLANT LEVEL SWITCH SENSE
18 P132 20OR/BK SEAT HEATER SWITCH SENSOR GROUND
19 X10 20RD/BK RADIO CONTROL MUX RETURN
20 G32 20BK/LB SENSOR GROUND
21 L110 20BK/YL ULTRALIGHT SENSOR RETURN
22 V9 20WT/BK WINDSHIELD WIPER SWITCH RETURN
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 11

CONTROLLER ANTILOCK BRAKE - BLACK 24 WAY
CAV CIRCUIT FUNCTION
1 Z101 12BK/OR GROUND
2 B1 18YL/DB RIGHT REAR WHEEL SPEED SENSOR SIGNAL
3 B2 18YL RIGHT REAR WHEEL SPEED SENSOR 12 VOLT
SUPPLY
4- -
5 D25 18VT/YL PCI BUS
6 B6 18WT/DB RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
7 B7 18WT RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT
SUPPLY
8- -
9 A20 12RD/DB FUSED B(+)
10 F20 18DB/PK FUSED IGNITION SWITCH OUTPUT (RUN)
11 D52 18LG/WT (DIESEL) CAN C BUS(+)
12 - -
13 B22 18DG/YL VEHICLE SPEED SENSOR SIGNAL
14 D51 18DG/WT (DIESEL) CAN C BUS(-)
15 - -
16 Z102 12BK/OR GROUND
17 G9 18GY/BK BRAKE FLUID LEVEL SWITCH SENSE
18 L50 18WT/TN PRIMARY BRAKE SWITCH SIGNAL
19 B3 18LG/DB LEFT REAR WHEEL SPEED SENSOR SIGNAL
20 B4 18LG LEFT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
21 Z231 18BK GROUND
22 B8 18RD/DB LEFT FRONT WHEEL SPEED SENSOR SIGNAL
23 B9 18RD LEFT FRONT WHEEL SPEED SENSOR 12 VOLT
SUPPLY
24 A10 12RD/DG FUSED B(+)
COOLANT LEVEL SENSOR - LT. GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 G18 20PK/BK (EXCEPT LHD GAS) COOLANT LEVEL SWITCH SENSE
1 G18 18PK/BK (LHD GAS) COOLANT LEVEL SWITCH SENSE
2 Z307 20BK GROUND
CRANKCASE HEATER (DIESEL) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 Z18 20BR GROUND
2 F15 20RD/DG FUSED AUTO SHUT DOWN RELAY OUTPUT
8W - 80 - 64 8W-80 CONNECTOR PIN-OUTWJ

VEHICLE INFORMATION CENTER - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1- -
2 D25 20YL/VT PCI BUS
3 F70 20PK FUSED B(+)
4 Z155 20BK/OR GROUND
5 G5 20DB/WT FUSED IGNITION SWITCH OUTPUT (RUN-START)
6- -
VISCOUS/CABIN HEATER (DIESEL) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 A82 16PK/LG VISCOUS/CABIN HEATER RELAY OUTPUT
2 Z18 16BK GROUND
WASHER FLUID LEVEL SWITCH - GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 V11 20BK/TN WASHER FLUID SWITCH SENSE
2 Z141 20BK GROUND
WASTEGATE SOLENOID (DIESEL)-2WAY
CAV CIRCUIT FUNCTION
1 F15 18DB/WT FUSED AUTO SHUT DOWN RELAY OUTPUT
2 Y42 18OR/DB WASTEGATE SOLENOID CONTROL
WATER IN FUEL SENSOR (DIESEL) - BLACK 3 WAY
CAV CIRCUIT FUNCTION
1 K4 20BK/LB SENSOR GROUND
2 G123 20DG/WT WATER IN FUEL SENSOR SIGNAL
3 F15 20RD/DG FUSED AUTO SHUT DOWN RELAY OUTPUT
WJ8W-80 CONNECTOR PIN-OUT 8W - 80 - 127

CONNECTOR NAME/
NUMBERCOLOR LOCATION FIG.
Trailer Tow Brake Lamp Relay BK Left Quarter Panel N/S
Trailer Tow Circuit Breaker BK Left Quarter Panel N/S
Trailer Tow Connector BK In Rear Bumper 39
Trailer Tow Left Turn Relay BK Left Quarter Panel N/S
Trailer Tow Right Turn Relay BK Left Quarter Panel N/S
Transfer Case Position Sensor BK On Transfer Case 7
Transmission Control Module
(4.7L)BK Rear of Engine Compartment 14, 15, 18
Transmission Control Module
C1 (Diesel)BK Right Rear Side of Engine
CompartmentN/S
Transmission Control Module
C2 (Diesel)BK Right Rear Side of Engine
Compartment8
Transmission Solenoid (4.0L
Gas)BK Left Side of Transmission 12
Transmission Solenoid
Assembly (Diesel)BK On Transmission 8
Transmission Solenoid/TRS
Assembly (4.7L)GY Left Side of Transmission 16
Underhood Lamp BK At Lamp 6
Vehicle Information Center BK In Overhead Console N/S
Viscous/Cabin Heater (Diesel) BK Left Rear of Engine Compartment N/S
Washer Fluid Level Switch GY Left Front of Engine Compartment 3, 4
Wastegate Solenoid (Diesel) Near Power Distribution Center N/S
Water In Fuel Sensor (Diesel) BK Left Rear of Engine Compartment N/S
GROUNDS
GROUND NUMBER LOCATION FIG.
G100 (4.0L and Diesel) Near Starter N/S
G100 (4.7L) Near Intake Plenum N/S
G101 Near Battery 2
G102 Right Side of Engine 14, 15
G103 Right Side of Engine 7, 8, 10, 11, 14, 15
G104 (4.0L) Right Rear of Engine 10, 11
G104 (4.7L) Left Side of Engine 13
G105 Right Side of Engine 8
G106 Left Side of Engine Compartment 3, 4
G107 Left Side of Engine Compartment 3, 4
G108 Near Power Distribution Center 5
G200 Near Airbag Control Module 19, 20, 21, 22
G201 Near Airbag Control Module 19, 20, 21, 22
G300 Near Right Front Seat 34, 36
G301 Near Left Front Seat 33, 35
WJ8W-91 CONNECTOR/GROUND/SPLICE LOCATION 8W - 91 - 11
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

SPLICE
NUMBERLOCATION FIG.
S147 (Diesel) In T/O for Controller Anti-Lock Brake 4
S151 In Headlamp Assembly N/S
S152 In Headlamp Assembly N/S
S153 In Headlamp Assembly N/S
S154 In Headlamp Assembly N/S
S155 In Headlamp Assembly N/S
S156 In Headlamp Assembly N/S
S158 4.7L RHD Near T/O for Fuel Injector No. 1 13
S159 In T/O for C101 N/S
S160 (4.7L High
Output)In T/O for C102 N/S
S162 (Diesel) In T/O for Wastegate Solenoid 4, 8
S163 Near T/O for Leak Detection Pump 3
S165 (Diesel) Near T/O for Left Front Wheel Speed Sensor 4
S168 Near T/O for Intake Air Temperature Sensor 7, 8
S169 Near T/O for Engine Control Module C1 7, 8
S170 Near T/O for Engine Control Module C2 7, 8
S171 Near T/O for C113 7
S172 Near T/O for C113 7
S174 Near Washer Fluid Level Switch Connector 3
S176 Near T/O for Intake Air Temperature Sensor 7
S200 In Trough Near T/O for Passenger Heated Seat Switch 21
S200 (RHD) Upper Center Instrument Panel 22
S201 In Trough Near T/O for Front Power Outlet 21
S201 (RHD) Near T/O for Power Connector 22
S202 In Trough Near T/O for Passenger Heated Seat Switch 21
S202 (RHD) Upper Center Instrument Panel 22
S203 In Trough Near T/O for Cigar Lighter 21
S203 (RHD) Lower Center Instrument Panel 22
S204 In Trough Near T/O for Power Connector 21
S204 (RHD) Right Center Instrument Panel 22
S205 Near T/O for Adjustable Pedal Switch 21
S205 (RHD) Upper Center Instrument Panel 22
S206 Near T/O for Adjustable Pedals Switch N/S
S206 (RHD) Upper Center Instrument Panel 22
S207 In Trough Near T/O for Radio Connectors 21
S207 (RHD) Upper Center Instrument Panel 22
S208 In Trough Near T/O for Radio Connectors 21
S208 (RHD) Upper Center Instrument Panel 22
S209 In Trough Near T/O for Left Courtesy Lamp 21
S209 (RHD) Lower Center Instrument Panel 22
S210 In Trough Near T/O for Left Courtesy Lamp 21
8W - 91 - 14 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONWJ
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR FAN. DO
NOT WEAR LOOSE CLOTHING.
(48) Start the engine, inspect for leaks and correct
the fluid levels, as necessary.
SPECIFICATIONS
ENGINE - 4.0L
DESCRIPTION SPECIFICATION
Engine Type In-line 6 Cylinder
Bore and Stroke 98.4 x 86.69 mm
(3.88 x 3.413 in.)
Displacement 4.0L (242 cu. in.)
Compression Ratio 8.8:1
Firing Order 1±5±3±6±2±4
Lubrication Pressure Feed±Full Flow
Filtration
Cooling System Liquid Cooled±Forced
Circulation
Cylinder Block Cast Iron
Crankshaft Cast Nodular Iron
Cylinder Head Cast Iron
Camshaft Cast Iron
Pistons Aluminum Alloy
Combustion Chamber Dual-Quench
Connecting Rods Cast Malleable Iron
CAMSHAFT
Hydraulic Tappet
ClearanceZero Lash
Bearing Clearance 0.025 to 0.076 mm
(0.001 to 0.003 in.)
DESCRIPTION SPECIFICATION
Bearing Journal Diameter
No. 1 51.54 to 51.56 mm
(2.029 to 2.030 in.)
No. 2 51.28 to 51.31 mm
(2.019 to 2.020 in.)
No. 3 51.03 to 51.05 mm
(2.009 to 2.010 in.)
No. 4 50.78 to 50.80 mm
(1.999 to 2.000 in.)
Base Circle Runout
(MAX)0.03 mm
(0.001 in.)
Valve Lift
Intake 10.350 mm (0.4075 in.)
Exhaust 10.528 mm (0.4145 in.)
Valve Timing
Intake
Opens 12.4É BTDC
Closes 60.9É ABDC
Exhaust
Opens 49.8 BBDC
Closes 29.2É ATDC
Valve Overlap 41.6É
Intake Duration 253.3É
Exhaust Duration 259.É
CRANKSHAFT
End Play 0.038 to 0.165 mm
(0.0015 to 0.0065 in.)
Main Bearing Journal
Diameter
No. 1-6 63.489 to 63.502 mm
(2.4996 to 2.5001 in.)
No. 7 63.449 to 63.487 mm
(2.4980 to 2.4995 in.)
9 - 14 ENGINE - 4.0LWJ
ENGINE - 4.0L (Continued)

(5) If the leak is not detected, very slowly turn the
crankshaft and watch for leakage. If a leak is
detected between the crankshaft and seal while
slowly turning the crankshaft, it is possible the
crankshaft seal surface is damaged. The seal area on
the crankshaft could have minor nicks or scratches
that can be polished out with emery cloth.
CAUTION: Use extreme caution when crankshaft
polishing is necessary to remove minor nicks and
scratches. The crankshaft seal flange is especially
machined to complement the function of the rear oil
seal.
(6) For bubbles that remain steady with shaft
rotation, no further inspection can be done until dis-
assembled.
OIL
STANDARD PROCEDURE - ENGINE OIL
SERVICE
ENGINE OIL CHANGE
Change engine oil at mileage and time intervals
described in Maintenance Schedules.
Run engine until achieving normal operating tem-
perature.
(1) Position the vehicle on a level surface and turn
engine off.
(2) Hoist and support vehicle on safety stands.
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase
drain.
(5) Remove drain plug from crankcase and allow
oil to drain into pan. Inspect drain plug threads for
stretching or other damage. Replace drain plug if
damaged.
(6) Install drain plug in crankcase.
(7) Replace engine oil filter. (Refer to 9 - ENGINE/
LUBRICATION/OIL FILTER - REMOVAL).
(8) Lower vehicle and fill crankcase with specified
type of engine oil (Refer to LUBRICATION & MAIN-
TENANCE/FLUID TYPES - DESCRIPTION) and
amount of engine oil (Refer to LUBRICATION &
MAINTENANCE - SPECIFICATIONS).
(9) Install oil fill cap.
(10) Start engine and inspect for leaks.
(11) Stop engine and inspect oil level. Refer to
CRANKCASE OIL LEVEL INSPECTION .
USED ENGINE OIL DISPOSAL
Care should be exercised when disposing used
engine oil after it has been drained from a vehicle
engine.
CRANKCASE OIL LEVEL INSPECTION
CAUTION: Do not overfill crankcase with engine oil,
oil foaming and oil pressure loss can result.
The engine oil level indicator (Dipstick) is located
at the right rear of the 4.0L engine. Inspect engine
oil level approximately every 800 kilometers (500
miles). Unless the engine has exhibited loss of oil
pressure, run the engine for about five minutes
before checking oil level. Checking engine oil level on
a cold engine is not accurate.
To ensure proper lubrication of an engine, the
engine oil must be maintained at an acceptable level.
The acceptable levels are indicated between the ADD
and SAFE marks on the engine oil dipstick (Fig. 74).
(1) Position vehicle on level surface.
(2) With engine OFF, allow approximately ten min-
utes for oil to settle to bottom of crankcase, remove
engine oil dipstick.
(3) Wipe dipstick clean.
(4) Install dipstick and verify it is seated in the
tube.
(5) Remove dipstick, with handle held above the
tip, take oil level reading (Fig. 74).
(6) Add oil only if level is below the ADD mark on
dipstick.
OIL FILTER
REMOVAL
CAUTION: Do not use oil filter with metric threads.
The proper oil filter has SAE type 3/4 X 16 threads.
An oil filter with metric threads can result in oil
leaks and engine failure.
Fig. 74 Engine Oil DipstickÐ4.0L Engine
1 - DIPSTICK
2 - ADD
3 - SAFE
WJENGINE - 4.0L 9 - 53
LUBRICATION (Continued)