Target Audience:
Jeep Wrangler TJ 2003 owners seeking to perform maintenance, diagnostics, and repairs themselves, as well as professional technicians.
Value Proposition:
Offers significant cost savings on repair bills by empowering owners to perform DIY maintenance and repairs, mirroring the information used by professional mechanics.
Accessibility:
Instant download provides immediate access to repair information, eliminating shipping delays and costs.
Comprehensiveness:
Covers all models, engines, transmissions, and trim levels, providing a complete reference for the 2003 TJ generation.
Accuracy:
Original workshop manual quality, written by manufacturers, ensuring accuracy and completeness.
Models Covered:
All TJ Models (e.g., Sport, Sahara, Rubicon)
Engine Variants Covered:
All Engine Types
Transmission Types Covered:
All Transmission Types (Manual and Automatic)
Trim Levels Covered:
All Trim Levels
Estimated Page Count:
Hundreds of pages (specific count not provided, but described as 'hundreds')
Type:
Workshop Repair Service Manual
Engine Service:
Engine service, repair, diagnostics, cooling system, fuel injection/fuel system, emission system, engine control system.
Transmission Service:
Transmission service and repair for both manual and automatic transmissions.
Brake System:
Complete coverage of the brake system.
Electrical System:
Comprehensive coverage of the electrical system, including diagnostics and wiring diagrams.
Suspension Steering:
Suspension and steering system diagnosis, repair, and maintenance.
Chassis Body:
Chassis and body repair and maintenance.
Drivetrain:
Differential and axle service/repair, drive system components.
Comfort Convenience:
Heater/Air Conditioning system, interior components.
Safety Restraint:
Restraint system (airbags, seatbelts) information.
Maintenance:
General maintenance, periodic lubrication, fluid changes, component checks.
Troubleshooting:
Extensive troubleshooting guidance for diagnosing and resolving issues.
Repair Rebuild:
Detailed repair and rebuild procedures for all major vehicle systems.
Diagnostics:
Diagnostic procedures for identifying faults, particularly in the electrical and engine control systems.
Wiring Diagrams:
Inclusion of detailed wiring diagrams for accurate electrical troubleshooting and repair.
Disassembly Assembly:
Step-by-step instructions for component disassembly and reassembly.
Depth:
Professional-level technical information used by local service/repair shops, covering everything from basic maintenance to complex repairs and diagnostics.
Detail Level:
Detailed substeps, notes, cautions, warnings, numbered instructions, and bold figure numbers for clear procedural guidance.
Illustrations:
Hundreds of pages of detailed illustrations, drawings, and photos, including enlarged insets for parts examination.
Engine Code Common:
4.0L (e.g., PowerTech Inline-6, often designated as ERH)
Horsepower 4.0L:
Approximately 190 HP @ 4600 RPM
Torque 4.0L:
Approximately 235 lb-ft @ 3200 RPM
Injection Type:
Multi-Port Fuel Injection (MPI)
Coolant Type:
Refer to manual for specific Mopar OAT coolant type or equivalent (e.g., HOAT orange/pink).
Manual Transmission:
NV3550 (5-speed manual)
Automatic Transmission:
42RLE (4-speed automatic)
Transfer Case Standard:
New Process NP231 Command-Trac (2WD High, 4WD High, Neutral, 4WD Low)
Transfer Case Rubicon:
New Process NP241OR 'Rock-Trac' (2WD High, 4WD High, Neutral, 4WD Low with 4:1 ratio)
Automatic Transmission Fluid:
Mopar ATF+4 (or equivalent)
Manual Transmission Fluid:
Refer to manual for specific gear oil specification (e.g., GL-3 or GL-4, 75W-90 synthetic is common).
NHTSA Rollover Resistance:
Refer to specific NHTSA data, known for being a top-heavy vehicle susceptible to rollovers in certain driving conditions without proper driver input.
Braking System:
Front Disc Brakes, Rear Drum Brakes (standard on most trims); Front and Rear Disc Brakes (standard on Rubicon and optional on others).
Airbags:
Driver and Passenger front airbags.
Audio System:
Basic AM/FM/CD player with optional premium sound systems. Aftermarket head units are common upgrades.
Speaker Configuration:
Typically 2-4 speakers, with optional sound bar and subwoofer in later models.
ABS:
Anti-lock Braking System (ABS) was optional on most models and standard on Rubicon.
Factory Bluetooth:
Not available from the factory in 2003. Aftermarket solutions are prevalent.
Oil Change Interval:
Typically 5,000 miles or 6 months (refer to manual for specific severe/normal duty).
Tire Rotation Interval:
Every 5,000-7,500 miles
Transmission Fluid Change:
Automatic: Check periodically, change as per severe duty or specific mileage (e.g., 60,000-100,000 miles depending on usage). Manual: Inspect, typically long-life but manual suggests inspection/change.
Engine Oil Type:
SAE 10W-30 (refer to manual for exact specification based on climate and engine variant, often synthetic blend or full synthetic recommended).
Engine Oil Capacity:
4.0L: 5 quarts (4.7 liters) with filter
Coolant Capacity:
4.0L: Approximately 11.8 quarts (11.2 liters)
Common Problems 4.0L:
Cracked cylinder heads (less common on later 4.0L in TJ than earlier versions, but still a possibility), oil filter housing leaks, rear main seal leaks, heater core leaks.
Common Problems General:
Worn track bar bushings, death wobble (often related to steering/suspension wear), transfer case seal leaks, catalytic converter failure, rust on body and frame components.
Off Road Capability:
Consistently recognized for its superior off-road capability, especially in Rubicon trim, making it a benchmark in its class.
Resale Value:
Jeep Wranglers, including the TJ generation, are known for holding strong resale values due to their enduring popularity and off-road prowess.
