🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Year:

2004

Chassis Code:

WJ / WG (WG for diesel variant)

Product Identifier:

2004 Jeep Grand Cherokee WJ WG Service Repair Manual-Diagnostic

👋 Introduction

Segment:

Mid-size SUV

Target Audience:

DIY mechanics, independent repair shops, Jeep enthusiasts seeking in-depth knowledge.

Key Competitors:

Ford Explorer, Chevrolet TrailBlazer, Toyota 4Runner, Nissan Pathfinder.

Differentiation:

Off-road capability (Quadra-Drive II), refined interior for its class, robust construction.

Vehicle Strengths:

Strong towing capacity, capable off-road performance, comfortable ride for an SUV of its era, spacious interior.

Manual Value Proposition:

Provides factory-level repair and diagnostic information essential for maintaining and troubleshooting this robust SUV, particularly the specific diesel WG variant.

📋 Manual Details

Global Coverage:

Primarily North America (WJ) and specific markets for WG diesel variant

Region Specific Notes:

WG designation typically indicates the diesel variant, often sold in European and other international markets.

Total Estimated Pages:

Over 2000 pages (estimated across all 10 PDF files)

Service Manual Part 1 Pages:

Variable, typically 800-1200 pages

Service Manual Part 2 Pages:

Variable, typically 800-1200 pages

Diagnostic Manual Pages:

Variable per manual, estimated 100-200 pages each

Primary Manual:

Factory Authorized Service Manual

Diagnostic Modules:

Dedicated Diagnostic Manuals (6 specific modules)

Parts Information:

Included (2 Parts List documents)

Language:

English

File Format:

PDF

📖 Manual Coverage

Powertrain:

Engine mechanical, fuel system, ignition system, exhaust system, transmission (automatic), transfer case, driveline components.

Chassis:

Suspension (front and rear), steering system, brake system (hydraulic, ABS), wheels, tires.

Body:

Body structure, exterior panels, interior trim, doors, windows, seats, HVAC system, body electrical.

Electrical:

Battery, charging system, starting system, lighting, instrument cluster, power accessories, comfort and convenience systems, fuse and relay identification, wiring diagrams.

Diagnostics:

OBD-II diagnostics, diagnostic trouble codes (DTCs), symptom-based troubleshooting, diagnostic procedures for specific modules (e.g., engine control, ABS, transmission control).

Routine Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, tire rotation, spark plug replacement.

Repair Procedures:

Step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation.

Troubleshooting:

Fault finding procedures, diagnostic flowcharts, common problem diagnosis.

Component Overhaul:

Detailed procedures for rebuilding major components like engines, transmissions, and differentials.

Electrical System Repair:

Wiring harness repair, component testing, diagnostic tool usage.

Diagnostic Tool Usage:

Specific instructions on using diagnostic scanners and equipment for fault identification and system testing.

Depth:

Comprehensive: Covers everything from basic preventative maintenance and routine service to complex diagnostic procedures and complete component overhauls.

Detail Level:

Factory-level detail, including torque specifications, tolerances, special tool requirements, and wiring diagrams.

📊 Manual Specifications

File Type:

PDF (Portable Document Format)

Searchability:

Likely text-searchable, allowing for quick navigation of topics.

Print Readability:

Designed for clarity; illustrations and diagrams should be crisp and legible when printed.

Digital Format:

N/A (Digital Files)

Digital Format:

N/A (Digital Files)

⚙️ Engine Specifications

Engine Code:

4.7L V8 (P-Code: PowerTech)

Displacement:

4.7 Liters (287 cu in)

Configuration:

Overhead Valve (OHV), 90-degree V8

Horsepower:

Approx. 235 hp @ 4750 rpm (varies slightly by sub-model)

Torque:

Approx. 300 lb-ft @ 3300 rpm (varies slightly by sub-model)

Fuel System:

Sequential Multi-Port Fuel Injection (MPI)

Engine Management:

Distributorless Ignition System (DIS) with Coil-on-Plug (COP)

Engine Code:

4.0L Inline-6 (P-Code: PowerTech)

Displacement:

4.0 Liters (242 cu in)

Configuration:

Inline 6-cylinder, Overhead Valve (OHV)

Horsepower:

Approx. 195 hp @ 4600 rpm

Torque:

Approx. 230 lb-ft @ 3200 rpm

Fuel System:

Sequential Multi-Port Fuel Injection (MPI)

Engine Management:

Distributorless Ignition System (DIS) with Coil-on-Plug (COP)

Engine Code:

2.7L CRD (VM Motori)

Displacement:

2.7 Liters (164 cu in)

Configuration:

Inline 5-cylinder, Turbocharged Diesel, Common Rail Direct Injection (CRDI)

Horsepower:

Approx. 140-163 hp @ 4000 rpm (depending on variant)

Torque:

Approx. 265-295 lb-ft @ 1800-2200 rpm (depending on variant)

Fuel System:

Bosch Common Rail Direct Injection (CRDI)

🔧 Transmission

Transmission Type:

4-Speed Automatic

Transmission Model:

45RFE / 545RFE

Fluid Type:

ATF+4 (Mopar)

Transmission Type:

4-Speed Automatic

Transmission Model:

42RE

Fluid Type:

ATF+4 (Mopar)

Transmission Type:

5-Speed Automatic

Transmission Model:

545RFE (likely, adapted for diesel)

Fluid Type:

ATF+4 (Mopar)

Standard Transfer Case:

NV231 Command-Trac (Part-Time 2-Speed)

Optional Transfer Case:

NV247 Quadra-Trac II (Full-Time 2-Speed with electronic 4WD)

Premium Transfer Case:

NV247-HD Quadra-Drive II (Full-Time 4WD with electronic front/rear differentials)

📐 Dimensions

Length:

Approx. 184.5 inches (4686 mm)

Width:

Approx. 72.4 inches (1839 mm)

Height:

Approx. 67.5 inches (1715 mm)

Wheelbase:

Approx. 109.0 inches (2769 mm)

Ground Clearance:

Approx. 8.7 inches (221 mm) (varies by model and tire size)

Passenger Volume:

Approx. 105.0 cu ft (2973 liters)

Seating Capacity:

5 passengers

Cargo Volume Behind Rear Seat:

Approx. 39.0 cu ft (1104 liters)

Cargo Volume With Rear Seat Folded:

Approx. 72.3 cu ft (2047 liters)

Curb Weight:

Approx. 4100-4600 lbs (1860-2087 kg) (varies by engine and equipment)

Gross Vehicle Weight Rating Gvwr:

Approx. 5700-6100 lbs (2585-2767 kg) (varies)

Towing Capacity:

Up to 7,700 lbs (3493 kg) (with optional towing package and specific engine/axle configurations)

🛡️ Safety Features

NHTSA Front Impact Driver:

4 Stars (2004 Model Year)

NHTSA Front Impact Passenger:

4 Stars (2004 Model Year)

NHTSA Side Impact Front Seat:

5 Stars (2004 Model Year)

NHTSA Side Impact Rear Seat:

4 Stars (2004 Model Year)

IIHS Front Offset Score:

Acceptable (2004 Model Year)

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Optional Traction Control System (TCS) on some models, integrated with ABS.

Electronic Stability Control:

Electronic Stability Program (ESP) available on some later models, often integrated with ABS/TCS.

Airbags Front:

Standard dual front airbags.

Airbags Side:

Optional front side-impact airbags.

Seatbelts:

3-point front and rear seat belts with pretensioners and load limiters.

💡 Technology Features

Head Unit:

Factory AM/FM/CD player, optional Infinity premium audio system, optional CD/cassette combination.

Navigation:

Optional factory navigation system available on higher trims.

Cruise Control:

Standard electronic cruise control.

Parking Assist:

Rear parking assist system available as an option on some models.

Auxiliary Input:

Typically no standard auxiliary audio input; aftermarket solutions required.

🔧 Maintenance

Oil Change Interval:

Every 5,000-7,500 miles (8,000-12,000 km) or 6 months, depending on driving conditions (consult manual for specifics).

Air Filter Replacement:

Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on driving environment.

Spark Plug Replacement 4.0L:

Approx. 100,000 miles (160,000 km) with OE iridium plugs.

Spark Plug Replacement 4.7L:

Approx. 100,000 miles (160,000 km) with OE iridium plugs.

Oil Change Interval Diesel:

Every 5,000-7,500 miles (8,000-12,000 km) or 6 months (consult manual for specifics).

Fuel Filter Replacement Diesel:

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

Engine Oil 4.0L/4.7L:

SAE 5W-30 (synthetic blend or full synthetic recommended) or SAE 10W-30 for extreme heat. Check Owner's Manual for precise specifications.

Engine Oil Diesel:

API CJ-4 or CK-4 rated diesel engine oil, viscosity grade 5W-40 or 15W-40 (consult manual for exact specifications).

Coolant:

Mopar OAT (Old About Technology) 5/150 Antifreeze/Coolant (Orange) or equivalent HOAT coolant.

Brake Fluid:

DOT 3.

Power Steering Fluid:

Mopar Power Steering Fluid or ATF+4.

Common Issue Cooling System:

Radiator leaks, heater core issues, water pump failures.

Common Issue Engine 4.7L:

Cylinder head cracking (especially early models), oil filter adapter housing leaks, oil sludge buildup if maintenance is neglected.

Common Issue Engine 4.0L:

Rear main seal leaks, valve cover gasket leaks, occasional oil sludge.

Common Issue Transmission:

Torque converter shudder, internal transmission leaks, failure of the electronic pressure transducer (on 545RFE).

Common Issue Electrical:

Window regulator failures, power seat failures, instrument cluster issues, ABS sensor failures.

Common Issue Diesel Wg:

Glow plug issues, turbocharger problems, diesel particulate filter (DPF) clogging (depending on specific market variant and emissions controls).

📚 Vehicle History

Brand Legacy:

Jeep has a long-standing reputation for off-road capability and ruggedness, dating back to its military origins.

Generation Name:

Second Generation WJ

Production Years:

1999-2004

Key Updates 2004:

Refinement of the 4.7L V8, updated interior features on higher trims, potential minor exterior styling tweaks.

Assembly Location:

Jefferson North Assembly, Detroit, Michigan, USA.

Platform:

Shared platform with Mercedes-Benz M-Class (W163) during DaimlerChrysler era.

🏆 Awards & Recognition

Off Road Awards:

Jeep Grand Cherokee models, particularly those with Quadra-Drive II, consistently praised for off-road capability in automotive reviews.

Consumer Reports Reliability:

Mixed reliability ratings across its lifecycle, with specific common issues documented (as noted in maintenance section).

Manual Certification:

Factory-level documentation, representing official Jeep service and repair standards.