🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Year:

2003

Chassis Code:

WJ

Product Name:

Jeep Grand Cherokee WJ 2003 All Service Repair Manual

Product Description Snippet:

Jeep Grand Cherokee WJ 2003 All Service Repair Manual Download. So many people prefer to do car repairs with their own hands in order to be sure of the highest quality of the work. Also, a lot of people find it wis......

👋 Introduction

Positioning:

The 2003 Jeep Grand Cherokee WJ represented a refined iteration of Jeep's popular mid-size SUV, known for its robust capability, comfortable ride, and premium features for its era.

Competitors:

Competed directly with vehicles like the Ford Explorer, Toyota 4Runner, Chevrolet TrailBlazer, and Nissan Pathfinder.

Features:

Available with powerful V8 engines, advanced four-wheel-drive systems (Quadra-Drive II), comfortable interiors, and a focus on towing and off-road capability.

📋 Manual Details

Coverage Scope:

All Service Repair

Estimated Page Count:

1500-2500

Type:

Service and Repair Manual

Language:

English

Format:

Downloadable Digital File (likely PDF)

📖 Manual Coverage

Engine Mechanical:

Detailed disassembly, assembly, overhaul, and component testing for all included engine variants.

Engine Management:

Diagnosis and repair of fuel injection, ignition, emissions control systems, and ECU troubleshooting.

Transmission Automatic:

Repair, diagnosis, and fluid service for the automatic transmission.

Transmission Manual:

Service and repair procedures for any manual transmission variants offered.

Drivetrain 4Wd:

Service for transfer case, differentials (front and rear), driveshafts, and CV joints for 4x4 systems.

Suspension:

Front and rear suspension component diagnosis, replacement, and alignment specifications.

Steering:

Power steering system diagnosis, repair, and component replacement.

Brakes:

Front and rear brake system inspection, repair, component replacement (pads, rotors, calipers), and bleeding procedures.

Electrical System:

Comprehensive wiring diagrams, component testing, diagnosis of charging and starting systems, lighting, and accessories.

HVAC:

Air conditioning system service, heater core replacement, climate control diagnosis.

Body And Frame:

Exterior panel repair, interior trim removal and installation, glass replacement, and basic frame straightening procedures.

Body Control Modules:

Diagnosis and potential programming for body control modules and related electronic components.

Preventive Maintenance:

Detailed schedules and instructions for oil changes, filter replacements, fluid checks, belt inspections, and tire rotations.

Troubleshooting:

Systematic diagnostic procedures and flowcharts for identifying and resolving common and complex issues.

Component Replacement:

Step-by-step guides for replacing major and minor components across all vehicle systems.

Engine Rebuild:

In-depth instructions for complete engine overhaul, including torque specifications, clearances, and assembly sequences.

Transmission Overhaul:

Detailed procedures for the complete disassembly, inspection, repair, and reassembly of automatic transmissions.

Brake Service:

Procedures for brake pad/shoe replacement, rotor resurfacing/replacement, caliper service, and brake fluid flushing.

Electrical Diagnostics:

Testing of sensors, actuators, modules, and wiring using multimeters and diagnostic scan tools.

HVAC Recharge:

Procedures for servicing and recharging the air conditioning system, including leak detection.

Wheel Alignment:

Specifications and procedures for front and rear wheel alignment adjustments.

Depth:

Comprehensive, covering from basic maintenance to full engine and transmission rebuilds, including electrical diagnostics.

Diagnostic Tools:

References diagnostic trouble codes (DTCs) and likely requires a scan tool for advanced diagnostics.

📊 Manual Specifications

Format:

Digital Download (PDF)

Quality:

High-resolution for clear text and diagrams, suitable for printing sections or the entire manual.

Binding:

N/A (Digital)

Paper:

N/A (Digital)

⚙️ Engine Specifications

Engine 1:

4.0L "Power Tech" Inline-6 (I6)

Engine 1 Code:

SOHC, 12-valve

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 Horsepower:

190 hp @ 4600 rpm

Engine 1 Torque:

235 lb-ft @ 3200 rpm

Engine 2:

4.7L "PowerTech" V8

Engine 2 Code:

SOHC, 16-valve (2 Valves Per Cylinder)

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 Horsepower:

230 hp @ 4700 rpm (standard), 235 hp @ 4700 rpm (premium fuel, later production)

Engine 2 Torque:

302 lb-ft @ 3200 rpm (standard), 305 lb-ft @ 3200 rpm (premium fuel, later production)

Fuel Delivery:

Sequential Multi-Port Fuel Injection (MPI)

Fuel Type:

Unleaded gasoline, Octane rating recommendation of 87 minimum for 4.0L, 89 recommended for 4.7L (premium may offer slight benefit).

Cooling Type:

Pressurized liquid cooling system

Coolant Capacity 4.0L:

Approx. 11.0 Quarts (10.4 Liters)

Coolant Capacity 4.7L:

Approx. 12.0 Quarts (11.4 Liters)

Oil Type 4.0L:

SAE 10W-30 (check manual for specific API service category)

Oil Type 4.7L:

SAE 5W-30 (check manual for specific API service category)

Oil Capacity 4.0L:

5.0 US Quarts (4.7 Liters) with filter

Oil Capacity 4.7L:

5.0 US Quarts (4.7 Liters) with filter

🔧 Transmission

Transmission Type 4.0L:

42RE 4-Speed Automatic

Transmission Type 4.7L:

45RFE / 545RFE 4-Speed Automatic (later models may have 545RFE)

Optional Transmission:

No manual transmission option for this generation in North America.

Transmission Fluid 42Re:

ATF+4 (MS-9602)

Transmission Fluid 45Rfe/545Rfe:

ATF+4 (MS-9602)

Transmission Fluid Capacity 42Re:

Approx. 9.6 US Quarts (9.1 Liters) for dry fill

Transmission Fluid Capacity 45Rfe/545Rfe:

Approx. 11.7 US Quarts (11.1 Liters) for dry fill

📐 Dimensions

Wheelbase:

116.0 inches (2946 mm)

Length:

185.5 inches (4712 mm)

Width:

73.3 inches (1862 mm)

Height:

67.0 inches (1702 mm)

Front Track:

61.6 inches (1565 mm)

Rear Track:

61.4 inches (1560 mm)

Ground Clearance:

8.4 inches (213 mm) typical

Cargo Volume Behind 1St Row:

Approx. 85.6 cu ft (2424 Liters)

Cargo Volume Behind 2Nd Row:

Approx. 37.5 cu ft (1062 Liters)

Curb Weight 4.0L:

Approx. 4,425 lbs (2007 kg)

Curb Weight 4.7L:

Approx. 4,575 lbs (2075 kg)

Towing Capacity Max:

Up to 5,000 - 6,500 lbs (2268 - 2948 kg), depending on configuration and engine.

Payload Capacity Max:

Approx. 1,000 - 1,200 lbs (454 - 544 kg)

Wheelbase Bolt Pattern:

5x5.5 inches (5x139.7 mm)

Standard Tire Size:

P235/65R17

Optional Tire Size:

P245/65R17, P235/70R16 (early models/lower trims)

🛡️ Safety Features

NHTSA Frontal Driver:

Good (as per NHTSA ratings for comparable vehicles of the era)

NHTSA Frontal Passenger:

Good (as per NHTSA ratings for comparable vehicles of the era)

IIHS Frontal Offset:

Acceptable/Good (depending on specific testing year and vehicle configuration)

ABS:

Standard Anti-lock Braking System (ABS) on all four wheels.

Traction Control:

Optional or standard depending on trim level; often part of the 4WD system (e.g., Traction Control System - TCS).

Stability Control:

Electronic Stability Program (ESP) became available on later WJ models or as an option, but may not be standard on all 2003 models.

Airbags Front:

Standard front driver and passenger airbags.

Airbags Side:

Optional front side-impact airbags available on some trims.

Seatbelts:

Front and rear seat belts, driver's side pretensioner.

Child Safety Anchors:

LATCH (Lower Anchors and Tethers for Children) system in rear seats.

💡 Technology Features

Audio System:

Factory premium audio systems, optional Infinity Gold with subwoofer, CD player, cassette player (on some models).

Navigation:

Optional factory navigation system (often touch screen).

Cruise Control:

Standard cruise control.

Parking Assist:

Optional rear parking assist sensors.

Auxiliary Input:

Not typically factory equipped; aftermarket solutions usually required.

Bluetooth:

Not factory equipped; aftermarket solutions usually required.

🔧 Maintenance

Oil Change Interval 4.0L:

Every 5,000-7,500 miles (8,000-12,000 km) or 6 months, whichever comes first. Severe service may require shorter intervals.

Oil Change Interval 4.7L:

Every 5,000-7,500 miles (8,000-12,000 km) or 6 months, whichever comes first. Severe service may require shorter intervals.

Transmission Fluid Change:

Every 30,000-60,000 miles (48,000-96,000 km) depending on usage (towing, severe conditions warrant more frequent changes). Check dipstick and condition.

Coolant Flush:

Every 30,000 miles (48,000 km) or 2 years for conventional coolant, or follow specific coolant manufacturer recommendations (e.g., HOAT).

Spark Plug Replacement:

4.0L: Platinum plugs typically good for 100,000 miles. 4.7L: Platinum plugs typically good for 100,000 miles.

Air Filter Replacement:

Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on driving conditions and visual inspection.

Power Steering Fluid:

ATF+4 (MS-9602) or Mopar power steering fluid.

Brake Fluid:

DOT 3 or DOT 4, depending on specific caliper/ABS module requirements (refer to cap or manual).

Common Issue 1:

Cracked cylinder heads on early 4.7L V8 engines (though this was more prevalent in earlier model years, it's a known concern for the engine family).

Common Issue 2:

Water pump leaks, especially on the 4.7L V8.

Common Issue 3:

Interior electronic module failures (e.g., Body Control Module - BCM) leading to various electrical gremlins.

Common Issue 4:

Heater core leaks leading to a sweet smell in the cabin or fogged windows.

Common Issue 5:

Transmission shifting issues or delays, often related to fluid condition or solenoids.

Common Issue 6:

Liftgate struts losing effectiveness.

Common Issue 7:

Death wobble or steering shimmy, often related to worn suspension components (track bar, ball joints, tie rod ends).

📚 Vehicle History

Jeep Heritage:

Jeep has a long-standing reputation for robust off-road capability and durable construction, dating back to its WWII origins.

Wj Generation:

The WJ Grand Cherokee was produced from 1999 to 2004, representing the second generation. The 2003 model year saw subtle updates to features and available powertrains.

Key Wj Updates:

Significant updates for the WJ included improved interior refinement, enhanced on-road manners, and the introduction of the advanced Quadra-Drive II 4x4 system.

Manufacturing Plant:

Jefferson North Assembly Plant, Detroit, Michigan, USA.

Production Years:

1999-2004