Market Position:
The 2004 Jeep Grand Cherokee WJ/WG represented a premium mid-size SUV, known for its off-road capability, luxurious interior appointments, and a range of powerful engine options, making it a strong contender against rivals like the Ford Explorer, Chevrolet TrailBlazer, and Toyota 4Runner.
Competitive Analysis:
Competed directly in the burgeoning mid-size SUV market, emphasizing comfort and on-road manners alongside Jeep's traditional off-road prowess. The WJ generation was lauded for its refined ride quality compared to its predecessors.
Key Features:
Independent front suspension for improved ride, available Quadra-Drive 4x4 system, spacious and comfortable interior, variety of powerful engine choices including a potent V8 and efficient diesel.
Coverage Areas:
Body, Chassis, Electrical Systems, Engine Mechanical, Transmission, Drivetrain, Suspension, Steering, Brakes, HVAC, Fuel System, Emission Control, Wiring Diagrams
Page Count:
Estimated 2500-3500 pages (typical for a comprehensive factory service manual of this era)
Manual Type:
Factory Service Manual / Shop Repair Manual
Systems Covered:
Engine (all gasoline and diesel variants), Transmission (automatic), Transfer Case, Drivetrain (4x4 systems), Suspension (front and rear), Steering, Brakes (ABS, standard), Electrical System (including lighting, power accessories, ECU), HVAC, Fuel and Emission Control Systems, Body and Chassis Components, Diagnostic Procedures.
Procedures Included:
Scheduled maintenance, routine inspections, diagnostic trouble codes (DTCs) interpretation and troubleshooting, component removal and installation, repair procedures, adjustments, fluid changes and checks, electrical circuit tracing, wiring harness repair, technical specifications and data, torque specifications, special tool recommendations.
Technical Depth:
Comprehensive, covering everything from basic fluid level checks and filter replacements to complete engine and transmission overhauls, complex electrical system diagnosis, and body panel repair.
Primary Engine Gas:
4.0L Inline-6 'PowerTech' (MPI - Multi-Point Injection)
Engine Code Gas:
ERH (4.0L)
Displacement Gas:
3952 cc (241 cubic inches)
Horsepower Gas:
195 hp @ 4600 rpm
Torque Gas:
230 lb-ft @ 3000 rpm
Optional Engine Gas:
4.7L V8 'PowerTech' (MPI - Multi-Point Injection)
Engine Code Gas V8:
EVS (4.7L V8)
Displacement Gas V8:
4701 cc (287 cubic inches)
Horsepower Gas V8:
235 hp @ 4750 rpm (standard 4.7L), 260 hp @ 5200 rpm (High Output 4.7L)
Torque Gas V8:
295 lb-ft @ 3200 rpm (standard 4.7L), 325 lb-ft @ 3500 rpm (High Output 4.7L)
Diesel Engine:
2.7L VM Motori L630 Turbo Diesel (CRD - Common Rail Diesel)
Engine Code Diesel:
ENF (2.7L CRD)
Displacement Diesel:
2700 cc (164.7 cubic inches)
Horsepower Diesel:
141 hp @ 4000 rpm
Torque Diesel:
265 lb-ft @ 1800 rpm
Fuel System:
Multi-Port Fuel Injection (MPI) for gasoline engines. Common Rail Direct Injection (CRD) for diesel engine.
Standard Transmission:
45RFE/48RE 4-speed Automatic Transmission (used across most powertrains)
Optional Transmission:
NV3550 5-speed Manual Transmission (less common, typically on base 4.0L models)
Features:
Selectable 2WD/4WD modes, Low-range gearing, advanced electronic control units for smooth shifts and fuel efficiency. The 48RE is a heavy-duty version of the 45RFE.
Fluid Type:
ATF+4 (MS-9602) for automatic transmissions. Manual transmission fluid varies by type (e.g., Mopar Manual Transmission Lubricant or equivalent).
Exterior Length:
183.7 inches (4666 mm)
Exterior Width:
73.5 inches (1867 mm)
Exterior Height:
67.0 inches (1702 mm)
Wheelbase:
109.5 inches (2781 mm)
Cargo Volume Behind Rear Seat
Cargo Volume Behind Rear Seat:
39.5 cubic feet (1118 liters)
Cargo Volume Total:
72.3 cubic feet (2047 liters)
Curb Weight:
Approximately 4,300 - 4,800 lbs (1950 - 2177 kg), depending on engine and equipment.
NHTSA Front Impact Driver:
Good (tested in 2003, applicable to 2004 model)
NHTSA Front Impact Passenger:
Good (tested in 2003, applicable to 2004 model)
IIHS Frontal Offset:
Good (tested in 2003, applicable to 2004 model)
Active Features:
Four-wheel Anti-lock Brake System (ABS), Traction Control System (TCS), Electronic Stability Program (ESP) available on some models.
Passive Features:
Front airbags, available front-side airbags, seatbelt pretensioners, reinforced body structure.
Infotainment:
Available premium sound systems with CD player, optional Infinity Gold audio system, steering wheel-mounted audio controls. Navigation system was an option on higher trims.
Driver Assistance:
Traction Control System (TCS), Electronic Stability Program (ESP) became more common on later models and higher trims. ABS is standard on all models.
Connectivity:
Power windows, power locks, remote keyless entry, available Uconnect hands-free communication system (late 2004 models), power adjustable pedals (on some trims).
Service Intervals Oil Change
Service Intervals Oil Change:
Every 5,000 - 7,500 miles (8,000 - 12,000 km) or 6 months, whichever comes first, depending on driving conditions and oil type used. Refer to manual for specific recommendations.
Service Intervals Air Filter
Service Intervals Air Filter:
Inspect every 15,000 miles (24,000 km), replace as needed or every 30,000 miles (48,000 km).
Service Intervals Transmission Fluid
Service Intervals Transmission Fluid:
Replace every 30,000 - 60,000 miles (48,000 - 96,000 km), depending on usage. Heavy towing or off-road use requires more frequent changes.
Fluid Specifications Engine Oil
Fluid Specifications Engine Oil:
SAE 5W-30 or 10W-30 (refer to specific engine recommendation and climate). Synthetic oil recommended for improved performance and protection.
Fluid Specifications Coolant
Fluid Specifications Coolant:
Mopar OAT (Orange) Antifreeze/Coolant (MS-9769) or equivalent HOAT (Hybrid Organic Acid Technology) coolant. A 50/50 mix with distilled water is standard.
Known Issues General:
Coolant leaks (radiator, hoses, water pump), transmission solenoid pack failures, front differential pinion seal leaks, electrical gremlins (especially around the instrument cluster and door modules), exhaust manifold cracks (on 4.0L), heater core issues.
Known Issues Diesel:
Injector issues, turbocharger problems, glow plug failures, EGR system clogging, possible head gasket issues on early models. The 2.7L CRD was less common in North America for this generation and can be more complex to service than the gasoline engines.
Spark Plug Part Number 4.0L
Spark Plug Part Number 4.0L:
Champion RE14PMCC (copper core, platinum gap) or equivalent.
Oil Filter Part Number 4.0L
Oil Filter Part Number 4.0L:
Mopar MO-090 or equivalent (e.g., Wix 51515, Fram PH8300).
Brand Heritage:
Jeep, a brand synonymous with off-road capability, has a rich history dating back to World War II. The Grand Cherokee nameplate was introduced in 1993 as Jeep's first luxury SUV, blending ruggedness with comfort.
Model Evolution:
The 2004 model year represents the final iteration of the second generation (WJ) Grand Cherokee, which debuted for the 1999 model year. This generation marked significant advancements in refinement, ride quality, and interior luxury for Jeep.
Production Location:
Jefferson North Assembly Plant, Detroit, Michigan, USA.
