Jeep Grand Cherokee WG 2003 Full Service Repair Manual

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🏷️ Basic Information Identification Make: Jeep Model: Grand Cherokee Model Code: WG Year: 2003 Generation Generation Code: WJ Codes Production Code: WG (Global Market designation for WJ) 👋 Introduction Market Position Vehicle Segment: Mid-size Luxury SUV Target Audience: Off-road enthusiasts, families, luxury SUV buyers Competitive Analysis Key Competitors 2003: Ford Explorer, Chevrolet TrailBlazer, Toyota 4Runner, Lexus RX 330, BMW X5, Mercedes-Benz ML-Class Key Features Off Road Capability: Renowned for its off-road prowess, especially with Quadra-Drive II system Luxury Appointments: Comfortable interior, available premium materials, advanced features for its time Towing Capacity: Strong towing capabilities, suitable for recreational and utility purposes 📋 Manual Details Coverage Areas Language: English Format: Digital (likely PDF) Manual Type: Full Service Repair Manual Page Count Estimated Page Count: 1500+ 📖 Manual Coverage Systems Covered Engine Mechanical: Engine overhaul, rebuild, component replacement (pistons, rings, bearings, valves, camshafts, crankshafts, cylinder heads, engine block) Engine Performance: Ignition system, fuel system, cooling system, lubrication system, exhaust system, emissions control Transmission Automatic: 42RE, 45RFE, 545RFE service, repair, overhaul, fluid specifications, torque converter Transmission Manual: NV3500 service, repair, overhaul, fluid specifications (if applicable to specific trims) Drivetrain: Four-wheel drive system (Quadra-Trac II, Quadra-Drive), transfer case repair, differential service (front and rear), axle components, driveshafts, CV joints Suspension: Front and rear suspension systems, coil springs, shock absorbers/struts, control arms, ball joints, bushings, sway bars, steering linkage Steering: Power steering system, steering gear/rack and pinion, steering column, alignment specifications Brakes: Front and rear brake systems (disc brakes), hydraulic system, ABS (Anti-lock Braking System), brake fluid specifications, rotor and pad replacement, caliper service Electrical System: Battery, charging system (alternator), starting system (starter motor), lighting (headlights, taillights, interior), power accessories (windows, locks, mirrors), wiring diagrams, fuses, relays Body And Frame: Body panel repair, doors, hood, tailgate, interior trim, glass replacement, chassis components, frame straightening (structural information) HVAC: Heating, Ventilation, and Air Conditioning system service, refrigerant handling, blower motor, evaporator, condenser, climate control unit Diagnostics: On-Board Diagnostics (OBD-II) system, diagnostic trouble codes (DTCs), troubleshooting procedures, diagnostic tools Procedures Included Routine Maintenance: Oil changes, filter replacements (oil, air, fuel, cabin), fluid checks and top-offs, tire rotation, brake inspection, battery testing Troubleshooting: System-specific diagnostic charts, symptom-based troubleshooting guides, common fault identification Component Replacement: Step-by-step instructions for replacing major components (e.g., water pump, alternator, starter, fuel pump, brake calipers, exhaust system parts) Rebuild Procedures: Detailed instructions for rebuilding engines, transmissions, transfer cases, and differentials Electrical Diagnostics: Schematic interpretation, continuity testing, voltage checks, component testing Suspension And Steering Alignment: Alignment procedures, camber, caster, toe adjustments Body Work And Trim: Panel removal and installation, interior trim piece removal, glass installation Technical Depth Depth Level: Comprehensive (from basic maintenance to full engine and transmission rebuilds) Diagnostic Capability: Advanced diagnostic procedures, including understanding and interpreting diagnostic trouble codes (DTCs) Specifications Accuracy: Detailed torque specifications, clearances, fluid capacities, and electrical values 📊 Manual Specifications File Format File Type: PDF (Portable Document Format) Searchability: Searchable text for quick information retrieval Printability: Printable pages for on-hand reference Resolution Quality: High-resolution scans or original digital documents for clear text and diagrams Binding Type Binding Type: N/A (Digital) Paper Type Paper Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine Option 1: 4.0L (3956cc) SOHC 12-valve V8 (PowerTech) Engine Option 1 Code: e.g., 4.0L HO (High Output) Engine Option 2: 4.7L (4701cc) SOHC 16-valve V8 (PowerTech) Engine Option 2 Code: e.g., 4.7L HO (High Output) Engine Option 3: 3.7L (3701cc) SOHC 12-valve V6 (PowerTech) Engine Option 3 Code: e.g., 3.7L Performance 4.0L V8 Horsepower: Approx. 190-205 hp (varies by specific tune) 4.0L V8 Torque: Approx. 225-235 lb-ft 4.7L V8 Horsepower: Approx. 235-265 hp (HO version) 4.7L V8 Torque: Approx. 300-330 lb-ft (HO version) 3.7L V6 Horsepower: Approx. 210-220 hp 3.7L V6 Torque: Approx. 235-245 lb-ft Fuel System Fuel Delivery: Multi-port Electronic Fuel Injection (MPI) Fuel Type: Unleaded gasoline Recommended Octane: 87 octane minimum (89 recommended for HO engines for optimal performance) 🔧 Transmission Standard Transmission Option 1: 42RE 4-speed automatic Optional Transmission Option 2: 45RFE 4-speed automatic (later revised to 545RFE) Transmission Option 3: NV3500 5-speed manual (less common) Features Overdrive Gears: All automatic transmissions feature overdrive Transfer Case Options: Command-Trac (2WD/4WD Part-Time), Selec-Trac (2WD/4WD Full-Time), Quadra-Trac II (4WD Full-Time with low range), Quadra-Drive II (Quadra-Trac II with Electronic Limited Slip Differentials) 📐 Dimensions Exterior Length: Approx. 184.4 inches (4684 mm) Width: Approx. 73.3 inches (1862 mm) Height: Approx. 67.5 inches (1715 mm) Wheelbase: Approx. 113.0 inches (2870 mm) Cargo Cargo Volume Behind 2Nd Row: Approx. 35.1 cu ft (994 liters) Cargo Volume Max: Approx. 75.1 cu ft (2127 liters) Weights Curb Weight: Approx. 4300-4700 lbs (1950-2130 kg), depending on engine and drivetrain Towing Capacity: Up to 5,000 lbs (2268 kg) when properly equipped 🛡️ Safety Features Ratings NHTSA Rollover Rating: 4/5 stars (for 2WD and 4WD models, though stability control varied by year/trim) Active Features ABS: Standard Anti-lock...

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Sku: 447807

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Labels: 2003 Car Cars Grand Cherokee WG Jeep Misc

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Description

🏷️ Basic Information

Identification

Make:

Model:

Grand Cherokee

Model Code:

Year:

Generation

Generation Code:

Codes

Production Code:

WG (Global Market designation for WJ)

👋 Introduction

Market Position

Vehicle Segment:

Mid-size Luxury SUV

Target Audience:

Off-road enthusiasts, families, luxury SUV buyers

Competitive Analysis

Key Competitors 2003:

Ford Explorer, Chevrolet TrailBlazer, Toyota 4Runner, Lexus RX 330, BMW X5, Mercedes-Benz ML-Class

Key Features

Off Road Capability:

Renowned for its off-road prowess, especially with Quadra-Drive II system

Luxury Appointments:

Comfortable interior, available premium materials, advanced features for its time

Towing Capacity:

Strong towing capabilities, suitable for recreational and utility purposes

📋 Manual Details

Coverage Areas

Language:

English

Format:

Digital (likely PDF)

Manual Type:

Full Service Repair Manual

Page Count

Estimated Page Count:

1500+

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine overhaul, rebuild, component replacement (pistons, rings, bearings, valves, camshafts, crankshafts, cylinder heads, engine block)

Engine Performance:

Ignition system, fuel system, cooling system, lubrication system, exhaust system, emissions control

Transmission Automatic:

42RE, 45RFE, 545RFE service, repair, overhaul, fluid specifications, torque converter

Transmission Manual:

NV3500 service, repair, overhaul, fluid specifications (if applicable to specific trims)

Drivetrain:

Four-wheel drive system (Quadra-Trac II, Quadra-Drive), transfer case repair, differential service (front and rear), axle components, driveshafts, CV joints

Suspension:

Front and rear suspension systems, coil springs, shock absorbers/struts, control arms, ball joints, bushings, sway bars, steering linkage

Steering:

Power steering system, steering gear/rack and pinion, steering column, alignment specifications

Brakes:

Front and rear brake systems (disc brakes), hydraulic system, ABS (Anti-lock Braking System), brake fluid specifications, rotor and pad replacement, caliper service

Electrical System:

Battery, charging system (alternator), starting system (starter motor), lighting (headlights, taillights, interior), power accessories (windows, locks, mirrors), wiring diagrams, fuses, relays

Body And Frame:

Body panel repair, doors, hood, tailgate, interior trim, glass replacement, chassis components, frame straightening (structural information)

HVAC:

Heating, Ventilation, and Air Conditioning system service, refrigerant handling, blower motor, evaporator, condenser, climate control unit

Diagnostics:

On-Board Diagnostics (OBD-II) system, diagnostic trouble codes (DTCs), troubleshooting procedures, diagnostic tools

Procedures Included

Routine Maintenance:

Oil changes, filter replacements (oil, air, fuel, cabin), fluid checks and top-offs, tire rotation, brake inspection, battery testing

Troubleshooting:

System-specific diagnostic charts, symptom-based troubleshooting guides, common fault identification

Component Replacement:

Step-by-step instructions for replacing major components (e.g., water pump, alternator, starter, fuel pump, brake calipers, exhaust system parts)

Rebuild Procedures:

Detailed instructions for rebuilding engines, transmissions, transfer cases, and differentials

Electrical Diagnostics:

Schematic interpretation, continuity testing, voltage checks, component testing

Suspension And Steering Alignment:

Alignment procedures, camber, caster, toe adjustments

Body Work And Trim:

Panel removal and installation, interior trim piece removal, glass installation

Technical Depth

Depth Level:

Comprehensive (from basic maintenance to full engine and transmission rebuilds)

Diagnostic Capability:

Advanced diagnostic procedures, including understanding and interpreting diagnostic trouble codes (DTCs)

Specifications Accuracy:

Detailed torque specifications, clearances, fluid capacities, and electrical values

📊 Manual Specifications

File Format

File Type:

PDF (Portable Document Format)

Searchability:

Searchable text for quick information retrieval

Printability:

Printable pages for on-hand reference

Resolution Quality:

High-resolution scans or original digital documents for clear text and diagrams

Binding Type

Binding Type:

N/A (Digital)

Paper Type

Paper Type:

N/A (Digital)

⚙️ Engine Specifications

Primary Engine

Engine Option 1:

4.0L (3956cc) SOHC 12-valve V8 (PowerTech)

Engine Option 1 Code:

e.g., 4.0L HO (High Output)

Engine Option 2:

4.7L (4701cc) SOHC 16-valve V8 (PowerTech)

Engine Option 2 Code:

e.g., 4.7L HO (High Output)

Engine Option 3:

3.7L (3701cc) SOHC 12-valve V6 (PowerTech)

Engine Option 3 Code:

e.g., 3.7L

Performance

4.0L V8 Horsepower:

Approx. 190-205 hp (varies by specific tune)

4.0L V8 Torque:

Approx. 225-235 lb-ft

4.7L V8 Horsepower:

Approx. 235-265 hp (HO version)

4.7L V8 Torque:

Approx. 300-330 lb-ft (HO version)

3.7L V6 Horsepower:

Approx. 210-220 hp

3.7L V6 Torque:

Approx. 235-245 lb-ft

Fuel System

Fuel Delivery:

Multi-port Electronic Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline

Recommended Octane:

87 octane minimum (89 recommended for HO engines for optimal performance)

🔧 Transmission

Standard

Transmission Option 1:

42RE 4-speed automatic

Optional

Transmission Option 2:

45RFE 4-speed automatic (later revised to 545RFE)

Transmission Option 3:

NV3500 5-speed manual (less common)

Features

Overdrive Gears:

All automatic transmissions feature overdrive

Transfer Case Options:

Command-Trac (2WD/4WD Part-Time), Selec-Trac (2WD/4WD Full-Time), Quadra-Trac II (4WD Full-Time with low range), Quadra-Drive II (Quadra-Trac II with Electronic Limited Slip Differentials)

📐 Dimensions

Exterior

Length:

Approx. 184.4 inches (4684 mm)

Width:

Approx. 73.3 inches (1862 mm)

Height:

Approx. 67.5 inches (1715 mm)

Wheelbase:

Approx. 113.0 inches (2870 mm)

Cargo

Cargo Volume Behind 2Nd Row:

Approx. 35.1 cu ft (994 liters)

Cargo Volume Max:

Approx. 75.1 cu ft (2127 liters)

Weights

Curb Weight:

Approx. 4300-4700 lbs (1950-2130 kg), depending on engine and drivetrain

Towing Capacity:

Up to 5,000 lbs (2268 kg) when properly equipped

🛡️ Safety Features

Ratings

NHTSA Rollover Rating:

4/5 stars (for 2WD and 4WD models, though stability control varied by year/trim)

Active Features

Standard Anti-lock Braking System (ABS)

Traction Control:

Available Traction Control System (TCS) and optional Electronic Stability Program (ESP) on later models

Four Wheel Drive Systems:

Advanced 4WD systems (Quadra-Trac II, Quadra-Drive II) enhance traction and control

Passive Features

Airbags:

Driver and front passenger airbags, available side curtain airbags

Seatbelts:

Front and rear seat belts, pretensioners

Child Seat Anchors:

LATCH (Lower Anchors and Tethers for Children) system

💡 Technology Features

Infotainment

Audio System:

AM/FM stereo with CD player, available premium Infinity sound system

Navigation:

Optional factory navigation system available on higher trims

Driver Assistance

Cruise Control:

Standard cruise control

Parking Assistance:

Optional rear parking assist sensors

Connectivity

Power Outlets:

12V power outlets

Remote Keyless Entry:

Available remote keyless entry system

🔧 Maintenance

Service Intervals

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 (consult manual for specifics)

Engine Air Filter:

Replace every 15,000-30,000 miles (24,000-48,000 km)

Cabin Air Filter:

Replace every 15,000-30,000 miles (24,000-48,000 km)

Transmission Fluid Change:

Every 30,000-60,000 miles (48,000-96,000 km) for automatic transmissions

Transfer Case Fluid Change:

Every 30,000-60,000 miles (48,000-96,000 km)

Coolant Flush:

Every 30,000-60,000 miles (48,000-96,000 km) or 2-4 years

Fluid Specifications

Engine Oil:

SAE 5W-30 or 5W-40 (synthetic recommended), API SG/SH/SJ certified

Transmission Fluid 42Re:

ATF+4 (Mopar)

Transmission Fluid 45Rfe/545Rfe:

ATF+4 (Mopar)

Transfer Case Fluid:

ATF+4 (Mopar) for Quadra-Trac II and Quadra-Drive II; NV247 requires specific Mopar fluid

Coolant:

Mopar OAT (Organic Additive Technology) or equivalent HOAT (Hybrid OAT) coolant, typically orange or yellow.

Brake Fluid:

DOT 3 or DOT 4

Known Issues

Power Steering Leaks:

Common issue with hoses and pump seals failing, leading to leaks and whining noises.

Transfer Case Slipping:

Early models and certain transfer cases can experience slipping due to worn clutches or faulty sensors/actuators.

Cooling System Overheating:

Radiator leaks, thermostat failures, and water pump issues can lead to overheating.

Head Gasket Failure:

More common on the 4.7L V8, especially HO versions, leading to coolant loss and white smoke.

Alternator Failure:

Alternators can fail prematurely, leading to battery discharge and charging system warning lights.

Transmission Hard Shifting:

Issues with solenoids, valve bodies, or transmission control modules can cause harsh shifts.

Body Rust:

Vulnerable areas like wheel wells, rocker panels, and frame rails can be susceptible to rust in certain climates.

📚 Vehicle History

Brand Heritage

Jeep Legacy:

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

Model Evolution

Wj Generation Introduction:

The WJ Grand Cherokee was introduced for the 1999 model year, replacing the ZJ generation. The 2003 model year falls within the mid-cycle refresh for the WJ.

Wj Updates 2003:

Model year 2003 saw minor refinements, including updated option packages and potentially minor feature changes across trims.

Production

Production Locations:

Assembled in Detroit, Michigan, USA and Graz, Austria (for European markets)

Production Years Wj:

1999-2004

🏆 Awards & Recognition

Recognitions

Off Road Designation:

Often praised by off-road publications for its capabilities, especially models equipped with Quadra-Drive II.

Segment Popularity:

A popular choice in the mid-size SUV segment for its blend of luxury, capability, and towing capacity.

Ratings

Consumer Satisfaction Notes:

Varied consumer satisfaction based on specific model year, engine, and maintenance history, with common themes around electrical and some powertrain components.