🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Model Code:

WG

Production Years:

2002, 2003

Chassis Code:

WG

Vehicle Platform:

WJ (Phase II)

👋 Introduction

Segment:

Mid-size Luxury SUV

Target Audience:

Jeep owners seeking professional repair and maintenance guidance, DIY enthusiasts, independent repair shops.

Competitors 2002 2003:

Ford Explorer, Chevrolet TrailBlazer, Toyota 4Runner, Nissan Pathfinder, Lexus RX330, BMW X5

Jeep Heritage:

Renowned for off-road capability and robust construction.

Wg Generation:

Represents a significant refinement of the WJ platform, focusing on improved on-road comfort and luxury appointments while retaining Jeep's signature capability.

📋 Manual Details

Coverage Scope:

All Styles

Estimated Pages:

Extensive (Typical factory service manuals for this era are 1500-2500+ pages)

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Digital (likely PDF)

📖 Manual Coverage

Powertrain:

Engine Mechanical (4.0L I6, 4.7L V8), Engine Performance, Fuel System, Exhaust System, Cooling System, Lubrication System, Ignition System

Transmission:

Automatic Transmissions (42RE, 45RFE/545RFE), Transfer Case (NV242, NV247)

Drivetrain:

Front Axle, Rear Axle, Driveshafts, CV Joints, Differentials

Suspension:

Front Suspension (Solid Axle), Rear Suspension (Solid Axle), Springs, Shocks, Bushings, Steering Linkage

Brakes:

Front Brakes (Disc), Rear Brakes (Disc), ABS, Brake System Hydraulic Controls, Parking Brake

Electrical:

Charging System, Starting System, Ignition System, Lighting, Instrumentation, Body Control Module (BCM), Powertrain Control Module (PCM), Fuses, Relays, Wiring Diagrams

Body:

Exterior Body Panels, Interior Trim, Doors, Windows, Seats, HVAC System, Body Sealing

Climate Control:

Air Conditioning (A/C) System, Heater System, Automatic Temperature Control (ATC)

Safety Systems:

Airbags, Seat Belts, Occupant Restraints

Maintenance:

Oil Change, Filter Replacement, Fluid Checks and Changes, Tire Rotation, Brake Pad Replacement, Spark Plug Replacement

Diagnostics:

Troubleshooting Guides, DTC (Diagnostic Trouble Code) Interpretation, Component Testing Procedures

Repair:

Engine Overhaul, Transmission Rebuild, Suspension Component Replacement, Brake Caliper Replacement, Electrical Component Repair, Body Panel Repair

Installation:

Accessory Installation, Component Replacement Procedures

Specifications:

Torque Specifications, Clearances, Tolerances, Diagnostic Data

Depth:

Comprehensive: Covers everything from routine maintenance to full engine and transmission overhauls, including detailed diagnostic procedures and wiring diagrams.

📊 Manual Specifications

File Type:

PDF

Searchability:

Searchable Text (if digitally produced from original source)

Quality:

High-resolution, suitable for printing

Binding:

N/A (Digital Format)

Paper:

N/A (Digital Format)

⚙️ Engine Specifications

Engine 1:

4.0L "PowerTech" Inline 6-cylinder

Engine 1 Displacement:

3952 cc (241 cu. in.)

Engine 1 Bore X Stroke:

98.5 mm x 86.7 mm (3.88 in. x 3.41 in.)

Engine 1 Compression Ratio:

8.8:1

Engine 1 Horsepower:

195 hp @ 4600 rpm

Engine 1 Torque:

230 lb-ft @ 3200 rpm

Engine 2:

4.7L "PowerTech" Magnum V8

Engine 2 Displacement:

4701 cc (287 cu. in.)

Engine 2 Bore X Stroke:

93.0 mm x 86.7 mm (3.66 in. x 3.41 in.)

Engine 2 Compression Ratio:

9.0:1

Engine 2 Horsepower:

235 hp @ 4500 rpm (2002), 255 hp @ 4500 rpm (2003)

Engine 2 Torque:

295 lb-ft @ 3200 rpm (2002), 315 lb-ft @ 3200 rpm (2003)

Fuel Delivery:

Sequential Multiport Electronic Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline (87 octane recommended for 4.0L, 89 octane recommended for 4.7L)

0 60 Mph Estimate:

Approx. 8.0 - 9.5 seconds (depending on engine and configuration)

🔧 Transmission

Transmission Std:

42RE 4-Speed Automatic (with 4.0L engine)

Transmission Opt:

45RFE / 545RFE 4-Speed Automatic (with 4.7L V8 engine, 545RFE introduced in 2003 with revised ratios)

Transmission Features:

Overdrive, Electronic Control, Tow/Haul Mode (on some models)

Transfer Case Std:

Selec-Trac (NV242) Full-Time 4WD (standard on some trims)

Transfer Case Opt:

Quadra-Trac II (NV247) Full-Time 4WD (standard on Overland, optional on others)

📐 Dimensions

Length:

Approx. 183.5 inches (4661 mm)

Width:

Approx. 72.4 inches (1839 mm)

Height:

Approx. 67.5 inches (1715 mm)

Wheelbase:

Approx. 116.0 inches (2946 mm)

Ground Clearance:

Approx. 8.4 inches (213 mm)

Curb Weight:

Approx. 4,500 - 5,000 lbs (2041 - 2268 kg) depending on configuration

Towing Capacity:

Up to 6,500 lbs (2948 kg) with optional towing package

Cargo Volume Behind 2Nd Row:

Approx. 33.7 cu. ft. (954 liters)

Cargo Volume With 2Nd Row Folded:

Approx. 74.5 cu. ft. (2110 liters)

🛡️ Safety Features

NHTSA Front Crash Test Rating:

4 stars (driver and passenger) - 2002 model year data

IIHS Front Crash Test Rating:

Good - 2002 model year data

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Available Traction Control System (TCS)

Airbags:

Standard front driver and passenger airbags. Available front side-impact airbags.

Seat Belts:

Three-point seat belts for all seating positions, pretensioners for front seats.

💡 Technology Features

Audio System:

Factory AM/FM/CD player with available premium Infinity Gold sound system, CD changer.

Navigation:

Optional factory navigation system (less common).

Cruise Control:

Standard cruise control.

Parking Assist:

Optional rear parking assist sensors.

Auxiliary Input:

No factory auxiliary input; aftermarket solutions available.

Climate Control Type:

Manual climate control or optional Automatic Temperature Control (ATC).

🔧 Maintenance

Oil Change Interval:

Every 3,000 - 7,500 miles (5,000 - 12,000 km) or 6-12 months, depending on driving conditions and oil type used (refer to manual for exact recommendation).

Transmission Fluid Change Interval:

Every 30,000 - 60,000 miles (48,000 - 96,000 km) for the automatic transmission fluid (ATF+4 for 45RFE/545RFE, ATF+3 for 42RE).

Coolant Change Interval:

Every 30,000 - 100,000 miles (48,000 - 160,000 km) or 2-5 years, depending on coolant type (usually HOAT or OAT).

Engine Oil Specification:

SAE 5W-30 (for 4.0L and 4.7L engines) - meeting Chrysler MS-6395 or API SN/SP specification. Always verify with manual.

Transmission Fluid Specification:

ATF+4 (MS-9602) for 45RFE/545RFE, ATF+3 (MS-7176) for 42RE.

Coolant Specification:

Chrysler HOAT (Hybrid Organic Acid Technology) or equivalent, typically a pink or orange color. Capacity: Approx. 11.9 Quarts (11.3 Liters) with 4.0L, 13.1 Quarts (12.4 Liters) with 4.7L.

Brake Fluid Specification:

DOT 3

Power Steering Fluid Specification:

Chrysler MS-5931 or equivalent (ATF+3/ATF+4 often used as a substitute, but verify).

Common Issues 4 0L:

Head gasket leaks, intake manifold gasket leaks, cracked cylinder heads (less common on later models), timing chain wear.

Common Issues 4 7L V8:

Valve stem seal issues (oil consumption), camshaft/lifter noise, cracked cylinder heads (more prevalent on earlier 4.7L engines, but can occur), spark plug blowout (on earlier versions).

Common Issues Transmission:

Valve body issues in 42RE, solenoid pack failures in 45RFE/545RFE, torque converter clutch shudder.

Common Issues Suspension Steering:

Worn ball joints, tie rod ends, control arm bushings, steering box wear, track bar bushings.

Common Issues Electrical:

Window regulator failures, power lock actuator failures, dashboard warning light illumination (various sensors), HVAC blower motor resistor failure.

📚 Vehicle History

Jeep Legacy:

Jeep has a long history of producing rugged, capable off-road vehicles dating back to World War II.

Wj Generation Start:

The WJ generation of the Grand Cherokee debuted for the 1999 model year, representing a significant redesign from the previous ZJ model, focusing on a more premium and refined experience.

Wj Phase Ii:

The 2002 and 2003 model years represent the 'Phase II' update for the WJ, which included styling revisions (grille, headlights, taillights), powertrain enhancements (improved 4.7L V8 output, introduction of 545RFE transmission), and interior updates.

Manufacturing Location:

Jefferson North Assembly Plant, Detroit, Michigan, USA

Production Period:

WJ generation produced from 1999 to 2004.

🏆 Awards & Recognition

Off Road Capability Award:

Consistently praised by automotive journalists and off-road enthusiasts for its capability, often earning high marks in its class for off-road performance.

Value Award:

Often cited as a strong value proposition in the luxury SUV market for its blend of capability, comfort, and features relative to price.