Vehicle Segment:
Mid-size SUV
Key Competitors 2002:
Ford Explorer, Chevrolet Blazer/TrailBlazer, Toyota 4Runner, Nissan Pathfinder, Mitsubishi Montero Sport
Vehicle Platform:
WG platform (shared with Mercedes-Benz ML-Class W163)
Drivetrain Options:
2WD and 4WD (Quadra-Trac II, Quadra-Drive)
Target Demographic:
Families, adventurers, those seeking towing capability and off-road prowess
Engine Systems:
Engine mechanical, fuel system, ignition system, lubrication system, cooling system, exhaust system, emissions control
Transmission Drivetrain:
Automatic Transmission (45RFE/545RFE), Manual Transmission (NV3500 - if equipped), Transfer Case (NV247, NV244), Drive Axles (Front and Rear)
Chassis Suspension Steering:
Front Suspension (Solid Axle with Coil Springs), Rear Suspension (Multi-link Solid Axle), Steering System (Power Assisted Rack and Pinion/Recirculating Ball), Brakes (Front Disc, Rear Disc, ABS)
Electrical Electronics:
Battery, Charging System, Starting System, Lighting, Instrumentation, Body Control Modules (BCM), Powertrain Control Module (PCM), Anti-lock Braking System (ABS), Airbag System (SRS), Power Accessories (Windows, Locks, Seats), HVAC Controls
Body Exterior Interior:
Body Panels, Doors, Hood, Tailgate, Bumpers, Glass, Seats, Upholstery, Trim, HVAC System (Ducting, Controls)
Maintenance Procedures:
Oil change, filter replacement, fluid checks and changes, tune-ups, brake service, tire rotation, battery maintenance
Repair Procedures:
Engine component replacement (alternator, starter, water pump, etc.), transmission service and overhaul, brake caliper and rotor replacement, suspension and steering component replacement, electrical component diagnosis and replacement, body panel repair
Troubleshooting Diagnostics:
Diagnostic Trouble Codes (DTCs), symptom-based troubleshooting, wiring diagrams, component testing procedures
Special Tools Techniques:
Required special tools for specific repairs, torque specifications, assembly/disassembly sequences
Depth Of Coverage:
Complete, from basic scheduled maintenance to in-depth engine and transmission overhauls, electrical system diagnostics, and body repair.
Standard Transmission Type:
4-speed Automatic (45RFE/545RFE)
Optional Transmission Type:
5-speed Manual (NV3500 - less common in WG)
Transfer Case Options:
NV247 (Full-time 4WD, Selec-Trac), NV244 (Part-time 4WD, Command-Trac - less common in WG)
4Wd Systems:
Quadra-Trac II (available with electronic transfer case), Quadra-Drive (includes electronic transfer case and front/rear electronic locking differentials)
Transmission Fluid Spec:
ATF+4 (Mopar)
NHTSA Front Impact Driver:
4/5 Stars
NHTSA Front Impact Passenger:
4/5 Stars
NHTSA Side Impact Front Driver:
4/5 Stars
NHTSA Side Impact Front Passenger:
4/5 Stars
NHTSA Rollover Resistance:
4/5 Stars (estimated)
Traction Control:
Available (part of 4WD systems)
Airbags:
Driver and front passenger airbags, available side curtain airbags
Seatbelts:
3-point front and rear seatbelts
Audio Options:
Standard AM/FM stereo with CD player, optional Infinity Gold premium audio system, optional cassette player.
Navigation:
Optional GPS navigation system (early generation).
ABS System:
Standard Anti-lock Braking System (ABS)
Traction Control Availability:
Available as part of the Quadra-Drive system.
Auxiliary Input:
No standard auxiliary input; aftermarket solutions may be available.
Oil Change Interval:
Every 3,000-7,500 miles or 6 months, depending on driving conditions and oil type (refer to manual for specifics).
Air Filter Replacement Interval:
Every 15,000-30,000 miles or 2 years.
Coolant Flush Interval:
Every 30,000 miles or 3 years.
Transmission Fluid Change Interval:
Every 30,000-60,000 miles or 3-5 years, depending on driving conditions.
Engine Oil Type:
SAE 5W-30 Synthetic Blend or Full Synthetic (API Certified)
Engine Oil Capacity 4.0L:
6 US quarts (5.7 liters)
Engine Oil Capacity 4.7L:
7 US quarts (6.6 liters)
Coolant Type:
Mopar OAT (Orange) Antifreeze/Coolant 10 Year/100,000 Mile Formula (or equivalent)
Common Issues 2002 Wj:
Head gasket leaks (especially 4.7L V8), rear main seal leaks, transmission valve body issues (45RFE/545RFE), rust in critical areas (frame, rocker panels), cooling fan clutch failure, power steering pump whine, ignition coil failure, transfer case pump seal leaks (NV247).
Jeep Legacy:
Founded on off-road capability and ruggedness, established in WWII with the Willys MB.
Grand Cherokee Genesis:
First introduced in 1993 as a more luxurious and comfortable alternative to the Cherokee (XJ).
Second Generation Zj To Wj:
The WG represents the second generation (1999-2004), featuring a significant redesign and sharing some components with Mercedes-Benz.
Wg Specifics:
Launched in late 1998 for the 1999 model year, the WG received minor updates for 2002, including revised interior trim and improved NV247 transfer case operation.
Manufacturing Locations:
Jefferson North Assembly, Detroit, Michigan, USA
